HORSCH Sprinter 4-6 ST

Transcription

1 07/2005 Specialists in modern cultivation and seeding technology HORSCH Sprinter 4-6 ST Art.: Operating Instructions Read carefully prior to starting up! Keep operating instructions in a safe place!

2 EC Declaration of Conformity In accordance with EC Directive 98/37/EC We, HORSCH Maschinen GmbH Sitzenhof 1 D Schwandorf do solely declare that the product HORSCH Sprinter 4 St from Serial No ST which is the subject of this declaration, fully conforms with the pertinent safety and health requirements specified in EC Directive 98/37/EC. The following harmonised standards and technical specifications were applied for correct interpretation of the safety and health requirements specified in the EC Directive: EN EN Schwandorf, Place and Date M. Horsch P. Horsch (Managing Director) (Development and Construction)

3 Machine Registration No warranty claims will be accepted if this machine registration form is not returned! Please detach and send to HORSCH Maschinen GmbH or give to the HORSCH service technician when receiving instruction To: HORSCH Maschinen GmbH Postfach D Schwandorf Type of machine:... Serial number:... Delivery date:... Date of issue of the operating instructions: 7/ Sprinter 4-6 ST en I hereby confirm receipt of the operating instructions and spare parts list for the above mentioned machine. I have been instructed by a HORSCH service technician or autorised dealer about the operation and functions of the machine, as well as about the safety requirements.... Name of the service technician Dealer Name:... Street:... Postal code:... Place:... Tel. :... Fax : Customer No. :... Additional equipment: Customer Name:... Street:... Postal code:... Place:... Tel. :... Fax : Customer No. :... I am aware that a warranty claim will only be valid if this form has been fully completed, signed and returned to Horsch Maschinen GmbH, or has been given to the service technician, immediately after first instruction Place, date of first instruction Buyer s signature

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5 - Translation of the Original Operating Instructions - Machine Identification The corresponding data is to be entered into the list below upon receiving the machine: Serial number:... Machine type:... Year of construction:... Initial installation:... Fittings: Publication date of Operation Manual: 07/2005 Address of Retailer: Name:... Road:... Town/City:... Tel.:... Customer No.: Retailer:... Address of HORSCH: HORSCH Maschinen GmbH Schwandorf, Sitzenhof Schwandorf, Postbox 1038 Tel.: 09431/ Fax: 09431/ info@horsch.com Customer No.: HORSCH:...

6 Table of contents Introduction...4 Foreword...4 Warranty claims...4 Use for the intended purpose...5 Consequential damage...5 Authorised operators...6 Protective clothing...6 Information regarding safety...7 Safety symbols...7 Operational safety...11 Road traffic safety...11 Accident prevention...11 Hitching up / disconnecting...11 Hydraulic connections...11 Changing equipment...12 During operation...12 Service and maintenance...12 Transportation / Installation...13 Delivery...13 Installation...13 DrillManager installation...14 Setting the bout markers...15 Setting the PE marker...15 Hitching-up the machine...16 Road lighting equipment...16 Hydraulic system Sprinter 4 ST...17 Hydraulic system Sprinter 6 ST...18 Hydraulic connections...19 Operation of shut-off valve...19 Folding wing sections of the frame...20 Parking the machine...22 Technical data...23 Sprinter 4 ST...23 Additional equipment...23 Sprinter 6 ST...23 Additional equipment...23 Settings / Operation...25 Description...25 Tines...26 Duett coulter - liquid fertiliser...27 Duett coulter - dry fertiliser...27 Replacing the Duett-coulter points...28 HORSCH Delta coulter...28 HORSCH Alpha coulter...29 Flexboot distributor...29 HORSCH Solo coulter...29 Grubber clip-on point...30 Harrow...31 Rear harrow...32 Rear packer...32 Front packer...33 Bout marker...34 Fan direct drive...35 Fan with PTO pump...37 Re-tightening the fan impeller...39 Distribution head...40 Hopper...40 Venturi-type injector...42 Metering unit...43 Roller replacement...44 Roller replacement with a full hopper...44 Checking rubber sealing strip...45 Roller for sowing small seed...45 Rape brushes...47 Large seed...47 Venturi-type injector...48 Metering unit maintenance...49 Calibrating the seed/fertiliser quantity...50 Sowing depth...50 Basic setting...50 Check basic position...51 Setting the sowing depth...51 Work instructions...52 Checks...53 HORSCH PPF system...54 Function...54 Operation...56 Nozzle disc selection...56 Suction and mesh filters...58 Repairing the hydraulic fertiliser pump...59 PPF system installation...59 Service and maintenance...61 Cleaning...61 Maintenance intervals...61 Preparation for storage...61 Lubricating the machine...62 Hygiene...62 Handling of lubricants...62 Service...62 Maintenance schedule...63 Lubrication points...65 Setting instructions...67 Bolt tightening torques - metric bolts...68 Bolt tightening torques - imperial bolts...69

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8 Introduction Foreword Before operating the machine, read the operating instructions thoroughly and adhere strictly to them. In doing so, you will avoid accidents, reduce repair costs and downtime and increase the reliability and service life of your machine. Pay attention to the safety instructions! HORSCH will not accept liability for any damage or malfunctions resulting from failure to comply with the operating instructions. These operating instructions will assist you in getting to know your machine and in using it correctly for its intended purposes. First, you are given general instructions in handling the machine. This is followed by chapters on servicing, maintenance and the action to be taken should a malfunction occur. These operating instructions must be read and strictly adhered to by all persons working on or with the machine, e.g., Warranty claims Warranty claim forms must be sent through your local HORSCH dealer to the HORSCH Service Department in Schwandorf. It is only possible to process claims which have been correctly completed and submitted no later than four weeks after the defect occurred. Exchange parts, which require the old part to be returned, are marked with an R. Please clean and empty such parts and return them within 4 weeks, along with a claim form and an exact description of the fault, to HORSCH. Exchange parts which do not require the old part to be returned. Please keep such parts for 6 weeks until a decision has been made on the action to be taken. Warranty repairs which are to be carried out by a third party company, or which are expected to take more than 10 working hours, must be agreed upon in advance with the Customer Service Department. operation (including preparation, remedying of faults in the operating sequence and servicing). maintenance (maintenance and inspection) transportation Together with the operating instructions, you receive a spare parts list and a machine registration form. Field service technicians will instruct you in the operation and care of your machine. Following this, the machine registration form must be returned to HORSCH. This confirms your formal acceptance of the machine. The warranty period begins on the date of delivery. We reserve the right to alter illustrations as well as technical data and weights contained in these operating instructions for the purpose of improving the machine.

9 Use for the intended purpose The drill is state of the art and designed in accordance with the relevant, recognised safety regulations. However, risks of injury to the operator or third parties and impairment of the machine or other tangible assets can occur during use. The machine must only be operated for its intended purpose if in a technically perfect condition, whilst being conscious of safety and risks and under strict observance of the operating instructions! Faults, particularly those which impair safety, must be remedied immediately. The machine must only be operated, serviced, repaired by persons who are familiar with it and have been made aware of the dangers involved. HORSCH original spare parts and accessories have been specially designed for this machine. Spare parts and accessories which are not supplied by us have not been tested or authorised. Installation or use of non-original HORSCH products may have a detrimental effect on specific design features of the machine and impair the safety of machine operators and the machine itself. HORSCH will accept no liability whatsoever for damage resulting from the use of non-original parts and accessories. Proper use also includes strict observance of the operating instructions and adherence to the operating, maintenance and repair instructions specified by the manufacturer. Consequential damage The machine has been manufactured by HORSCH with great care. Nevertheless, even when used properly, deviations or complete failure can occur in the application rate, e.g.: Different composition of the seed or fertiliser (e.g., grain size distribution, density, geometrical shape, dressing, sealing). Blockages or bridge formation (e.g., caused by foreign bodies, non-smooth seeds, sticky dressing, moist fertiliser). Worn wearing parts (e.g., metering unit) Damage caused by external influences. Incorrect drive motor speeds and driving speeds. Incorrect setting of the unit (incorrect connection, non-observance of the setting tables). Therefore, it is crucial to always check your machine before and during operation for correct operation and adequate application accuracy. Claims for compensation for damages which occur to anything other than the machine are excluded. This includes any consequential damage resulting from incorrect sowing and operation. The drill is designed to distribute seeds and fertilisers. Any other use over and above this, e.g., as a means of transport, will be deemed improper. HORSCH will accept no liability whatsoever for damage resulting from improper use. The risk will be borne solely by the operator. The relevant accident prevention regulations and the other generally accepted rules regarding health and safety, as well as road traffic regulations, must be complied with.

10 In these operating instructions The operating instructions distinguish between three different types of warning and safety instructions. The following graphic symbols are used: Important instructions. If there is a risk of injury! If there is a risk to life and limb! It is important that all the safety instructions contained in these operating instructions and all the warning signs on the machine are read thoroughly. Ensure that the warning signs are legible. Replace any signs that are missing or damaged. These instructions must be followed in order to prevent accidents. Inform other users of the warnings and safety instructions. Do not carry out any operations which may affect safe use of the machine. Authorised operators Only those persons who have been authorised and instructed by the operator may operate the machine. The operator must be at least 16 years of age. The operator must be in possession of a valid driving licence. He is responsible for third parties in the operating area. The person in charge must make the operating instructions available to the operator. ensure that the operator has read and understood these. The operating instructions are a component part of the machine. Protective clothing For operation and maintenance, you need: snug fitting clothing. Protective gloves, to protect against sharp edges on the machine. Goggles, to protect the eyes against dust or spray, when operating with fertiliser or liquid fertiliser. Strictly observe the handling instructions given by the fertiliser manufacturer. When handling dressing or dressed seed, wear a respirator mask and protective gloves. Strictly observe the handling instructions given by the dressing manufacturer.

11 Information regarding safety The following warnings and safety instructions apply to all sections of these operating instructions. Do not climb onto revolving parts. Only use mounting steps. Safety symbols On the machine Read and adhere to the operating instructions before starting up the machine! No passengers are allowed to ride on the machine! Switch the tractor OFF and remove the key before carrying out maintenance or repair work. Never reach into areas where there is a danger of being crushed by moving parts! Watch out for fluids spraying out under high pressure! Follow the operating instructions! In order to prevent eye injuries, do not look directly at the beam area when the radar sensor is switched ON!

12 Accumulator is under gas and oil pressure. Dismantle and repair only in accordance with the instructions in the technical manual. Lever up (closed): Bout marker and lifting separate. Lever horizontal (open): Lifting and bout marker together. It is only permitted to remain in the hazardous area when the safety support is in place. It is only permitted to remain in the hazardous area when the lifting cylinder safety device is applied. The return line pressure on the fan drive must not exceed 5 bar. Otherwise the hydraulic motor could be destroyed. max. 5 bar Keep clear of the operating range of foldable machine components! Replace filter and, if necessary, oil when return line pressure exceeds 2 bar. max. 2 bar

13 Lever position for switching over from operating position to transport position Max. permissible fan speed 4 ST: max /min 6 ST: max /min max /min Pressurise hydraulic folding system 4 ST: bar 6 ST: bar Retighten the wheel nuts / wheel bolts after 50 hours 50 h / Nm

14 Always connect all hydraulic lines. Otherwise, components could be damaged due to linked hydraulic functions The colour coding of the hydraulic function corresponds with the colour coding on the hydraulic hose (lifting - folding - bout marker - implements) When calibrating, attach the scales here. OFF ON ZERO Maschine Zeichnung Hydr_Funktionen Zeichnungsnummer Dateiname Lifting hook. Suspend load-bearing devices (chains, ropes, etc.) here when performing loading work Maschine alle Zeichnung Waage Zeichnungsnummer Dateiname 10

15 Operational safety The machine must only be put in operation after instruction has been provided by an employee of the authorised dealer or a HORSCH employee. The machine registration form has to be completed and returned to HORSCH. All protective and safety equipment, such as removable protective devices, must be in place and functioning reliably before the machine is put in operation. Check and tighten all nuts and screws at regular intervals. Check tyre pressure regularly. In the event of malfunctions, stop and secure the machine immediately! Road traffic safety Always observe the relevant road traffic laws when driving on public roads, tracks and other areas. Do not exceed the max. permissible width and fit a lighting system, hazard and protective devices. Take the height of the relevant machine into account when transporting it! Do not exceed the permissible axle loads, tyre carrying capacity, and laden weight in order to ensure adequate braking and steering capabilities. Handling is affected by the implement connected. It is important to take into account the large overhang, high centre of gravity and also the centrifugal mass of the implement, particularly when turning corners. Clean all soil off the machine before driving on public roads Passengers are strictly forbidden to ride on the machine. Accident prevention In addition to the operating instructions, it is important to observe the accident prevention regulations specified by agricultural trade associations! Hitching up / disconnecting There is a risk of injury when hitching up / disconnecting the machine to the drawbar of the tractor. Secure the machine against rolling away. Take special care when reversing the tractor! Never stand between the tractor and machine. Only park the machine on a firm, level surface. Before unhitching the machine, lower it to the ground. Hydraulic connections Do not connect the hydraulic lines to the tractor until both hydraulic systems (machine and tractor) are de-pressurised. The hydraulic system is under high pressure. Check all lines, hoses, and screwed connections regularly for leaks and any visible external damage! Only use appropriate aids when checking for leaks. Repair any damage immediately! Spurting oil can cause injuries and fires! In case of injury, contact a doctor immediately. The sockets and plugs for the hydraulic connections between the tractor and the machine should be colour-coded in order to avoid incorrect use. When transporting on public roads, drive at a max. speed of 25 km/h. 11

16 In order to prevent accidents as a result of unintentional hydraulic movements or those caused by third parties (children, passengers), the control units on the tractor must be secured or locked when not in use or in transport position. Changing equipment Secure the machine to prevent it from accidentally rolling away! Use suitable supports to secure any raised frame sections suspended above you! Caution! Risk of injury due to projecting parts (harrows, tines, coulters)! When climbing onto the machine, do not climb on the packer tyres or other revolving parts. These may revolve and you could fall and be seriously injured. During operation Before starting up and operating the machine, check the immediate area (children!). Always ensure adequate visibility. The prescribed protective equipment that was supplied with the machine must not be removed. No-one is to remain within the operating range of hydraulically operated parts. Only use climbing aids and stepping surfaces when the machine is at a standstill. It is forbidden to ride on the machine while it is in operation! Service and maintenance Ensure that regular tests and inspections are always carried out within the periods specified in the operating instructions. Prior to performing maintenance and servicing work, ensure that the machine is positioned on firm, level ground and is secured to prevent it from rolling away. De-pressurise the hydraulic system and lower or support the implement. Before cleaning the machine with high pressure cleaners, cover all openings into which water, steam or cleaning agents must not penetrate for reasons of safety or operation. Do not aim the water jet directly at electrical or electronic components, bearings or the fan. After cleaning, check all hydraulic lines for leaks and loose connections. Check hoses for chafing and other damage. Remedy any faults immediately! Prior to working on the electrical system, disconnect this from the power supply. When performing welding work on the machine, disconnect cables from computers and other electrical components. The ground connection must be as close as possible to the welding point. Retighten screwed connections which have been unscrewed during servicing and maintenance work. Do not wash new machines with a steam-jet or high-pressure cleaner. The paint only hardens after approx. 3 months and could be damaged prior to this. 12

17 Transportation / Installation When installing for the first time, there is an increased accident risk. Follow the instructions given in the relevant chapters. Delivery As a rule, the drill with fittings is delivered completely assembled on a low-loader truck. If components or assemblies have been dismantled for transportation, these will be installed in situ by our distributor or our factory mechanics. Depending on the design of the low-loader truck, the machine can be towed off with a tractor, or must be lifted off using suitable lifting gear (forklift truck or crane). In this case, it must be ensured that the loadcarrying capacity of the hoisting and lifting gear is adequate. The load lifting and securing points are marked by adhesive labels. Attention must be paid to the centre of gravity and weight distribution as far as other attachment points are concerned. These points must always only be on the frame of the machine. Installation Instruction of the operator and initial installation of the machine will be effected by our service technicians or distributors. Any premature use of the machine is prohibited! The machine can only be released for operation after instruction by the service technician/distributor and after the operating instructions have been read. There is an increased accident risk when performing installation and maintenance work. Before performing installation and maintenance work, familiarise yourself with the machine and read the operating instructions. Depending on the scope of equipment Remove all loosely supplied components from the machine. Remove all parts from the seed hopper! Check all important screwed connections! Lubricate all grease nipples! Check tyre pressures! Check all hydraulic connections for tightness and function. Remedy any faults, or have these remedied, immediately! 13

18 Input B Schalter - Switch-Box A Input B DrillManager installation When installing the model with DrillManager for the first time, the power module must be installed on the tractor. Install the module at a suitable place in the cab. It must be easily accessible for connection of the switchbox cables. The two cables must be routed to the battery. These must not chafe and the insulation must not be damaged. The positive line of the battery is protected against short-circuits by a 100 ampere fuse. If there is a power failure, check the fuse! The switch and display boxes are fastened in the field of vision of the driver by Velcro tape. Please refer to the chapter DrillManager for information regarding cable connection and operation of display box and switchbox. The connections to the battery must have good contact. Installation errors lead to voltage drops and to indefinable error messages and failures. The cables are never to be connected to other plugs in the cab. 1 2 Power Module + 4 GPS Module DrillManager assembly Connection cable tractor / drill Power module battery connection cables MiniDin cable GPS module (option) Switchbox Display box 14

19 Setting the bout markers No-one is to remain within the operating range of the bout markers. There are shearing and crushing points on all moving components. When installing for the first time, the bout markers must be set to the working width. Marking is effected in relation to the centre of the tractor. 4,0 m Setting the PE marker The working width of the PE marker (optional) must be adjusted to the track width of the tramlines. The solenoid valves for the tramline mode must be mounted to the same track width. The width of the PE markers is infinitely adjustable. To do this, unscrew the clamping screws on the holder and reposition the PE marker on the bar at the track width of your tractor used for spraying and fertilising. 2,12 m Sprinter 4 ST = 4 m Setting the bout markers The setting length of the bout markers is half the machine width plus half the coulter spacing, measured from the centre of the outermost coulter. E.g.: 400 cm: 2 = 200 cm 200 cm cm = cm On the Sprinter 4 ST the bout markers must be set to cm, on the Sprinter 6 ST to cm from the centre of the outermost coulter. PE marker Immediately the tramlines are actuated, the PE marker is also lowered and marks the track width for the spraying tractor. The marking depth must be adjusted to the field conditions. For deeper marking, the hydraulic cylinder must be repositioned in the longitudinal hole on the support arm. To do this, unscrew the clamping screws and shift both brackets the same distance. Changes in the harrow setting also have an effect on the PE marker. After setting harrows, adjust the PE marker setting if necessary. 15

20 Hitching-up the machine Road lighting equipment Nobody is to remain between the tractor and the machine when hitching up. R You can injure yourself on function-related sharp edges and when modifying the machine. Hitching-up: Secure tractor link arms to prevent sideways movement. Hitch machine up to the tractor. Connect drill control system. Connect hydraulic system for the control block and fan drive. Connect road lighting equipment. Lift drill and fold. Check folding lock L Drive only with an empty seed hopper. The maximum speed when transporting is 25 km/h. Road lighting equipment 1. 7-pin plug 2. Distribution box 3. Rear sidelight, right 4. Rear sidelight, left 5. Tail-light, right 5.1 Lamp, indicator 5.2 Lamp, tail-light 5.3 Lamp, brake light 6. Tail-light, left 6.1 Lamp, brake light 6.2 Lamp, tail-light 6.3 Lamp, indicator Plug and cable assignment: No. Descr. Colour Function 1. L yellow left indicator g white earth 4. R green right indicator R brown tail-light, right red brake light L black tail-light, left Check the road lighting equipment regularly. Failure to do so may put other road users at risk! 16

21 Hydraulic system Sprinter 4 ST Hydraulic system Sprinter 4 ST Spool valve Hydr. coupling Bout-marker shuttle valve Hydr. shut-off valve Hydr. cyl., bout marker (Tractor) spool valve with float position Shut-off valve Hydr. cyl., chassis Hydr. valve, PE marker Hydr. shut-off valve for PE marker Hydr. cyl., PE marker Hydr. shut-off valve, folding Pressure gauge Hydr. cyl. - folding, machine Hydr. cyl. - folding, packer The hydraulic system is under high pressure. Hydraulic oil escaping under pressure can penetrate the skin and cause serious injuries. In case of injury, consult a doctor immediately. The machines hydraulic system has several functions, which can cause injury to persons or damage to the machine if operated incorrectly. 17

22 Hydraulic system Sprinter 6 ST Hydraulic system Sprinter 6 ST Spool valve Hydr. coupling Bout-marker shuttle valve Hydr. shut-off valve Hydr. cyl., bout marker (Tractor) spool valve with float position Shut-off valve Four-way valve Hydr. cyl., chassis Hydr. cyl., packer Hydr. valve, PE marker Hydr. shut-off valve, PE marker Hydr. cyl., PE marker Hydr. shut-off valve, folding Pressure gauge Accumulator Hydr. cyl. - Folding The hydraulic system is under high pressure. Hydraulic oil escaping under pressure can penetrate the skin and cause serious injuries. In case of injury, consult a doctor immediately. The machines hydraulic system has several functions, which can cause injury to persons or damage to the machine if operated incorrectly. 18

23 Accumulator The hydraulic system of the Sprinter 6 ST is equipped with an accumulator. In order to prevent accidents, particular care must be taken when handling this. Operation of shut-off valve The two shut-off valves on the drawbar frame separate the lifting and bout-marker functions. Do not open or perform work (welding, drilling) on the accumulator. Even after being drained, the tank is prestressed with gas pressure. Always drain the accumulator prior to performing work on the hydraulic system. The pressure gauge must show no pressure. The pressure indicated on the pressure-gauge must have dropped to 0 bar. Only then may work be performed on the hydraulic system. Hydraulic connections Connect the hydraulic system only after it has been depressurised on the machine and implement side. In order to prevent confusion, the hydraulic couplings are colour-coded. Fold - black Bout marker - blue Lift - green Hydr. fan - not coded Drain the accumulator completely before hitching up the machine. When operating hydraulic components, control the spool valve before the machine components reach the limit stop. Shut-off valves with four-way valve on the Sprinter 6 ST If both shut-off valves are closed and the front lever is in the forward position and the back lever in the rear position, the two hydraulic circuits are separated, the lifting and the bout markers must be controlled via two spool valves. If both shut-off valves are open and the front lever is up and the back lever down, then both hydraulic circuits are connected and the bout markers will also be operated when lifting or lowering the machine. In case of malfunction of the hydraulic system, check the position of the shutoff valve levers. 19

24 Folding wing sections of the frame Nobody is to remain in the operating range of foldable machine components. When operating hydraulic components, control the spool valve before the machine components reach the limit stop! Commence the folding operations only when the machine has been lifted. Clean all soil off the folding area and folding cylinders. Clean the complete machine before driving on public roads. Folding: Operate the lift spool valve and lift machine. On the Sprinter 4 ST with rear harrows as additional equipment. Remove the two detachable extensions on the harrow and place these in the holder provided, with the harrow tines pointing towards the front. Operate the fold spool valve and fold the drill. The folding lock snaps into place automatically. To prevent accidents, the lock must be checked for proper operation. Sprinter 6 ST only. Move the four-way valve to the back position (road position). Activate the lifting spool valve again and retract the rear packer wheels to transportation width. Fill the piston rods of the hydraulic cylinders at the rear of the chassis with spacers (transportation protection for driving on the road). Lower the machine onto the transportation protection of the hydraulic cylinders and secure spool valve. The regulations require that the machine be lowered onto the transportation protection when driving on public roads. This relieves pressure in the hydraulic system and the machine holds the road more steadily and quietly. Harrow extensions in rear transportation holder Hydr. cylinder, chassis Four-way valve - only Sprinter 6 ST 20

25 Unfolding: Operate the lift spool valve and lift machine. Operate the spool valve and fold the machine briefly to relieve stress on the folding lock. Releasing the folding lock. Pull the locking device forwards, ensuring that the clamping mechanism drops down in order to prevent relocking. When unfolding, the two folding frames must be level with the main frame. When repairs are performed on the folding cylinder, or in the case of uneven seed distribution, check the frames and adjust the folding limit stops and the folding cylinder if necessary. Folding lock Remove the spacers from the chassis cylinders. Move the four-way valve on the Sprinter 6 ST and lift the machine again until the side packers are extended up to the limit stop Operate the spool valve and unfold the drill up to the limit stop. Sprinter 6 ST: Operate the spool valve until the pressure increases to bar. In the case of the Sprinter 4 ST, allow the pressure to increase to bar. On Sprinter 4 ST with additional rear harrow. Remove the harrow extension from the transportation holder and attach to the harrow. Folding-pressure gauge, on the left in the case of the double hopper and at the top in the case of the single hopper. Fan-pressure gauge, on the right in the case of the double hopper, at the bottom in the case of the single hopper. 21

26 Parking the machine The drill should be parked in a shed or under a roof so that no moisture can accumulate in the bin, metering unit, or the seed pipes. When manoeuvering, pay attention to the surroundings. Nobody (children) is to remain in the manoeuvring area of the machine. The machine can be parked in transportation or operating position. In the case of longer work breaks, the wheels should be relieved of load and the machine should rest securely on the tines. Park the machine on level and solid ground, switch off the tractor. Empty the seed hopper. Clean the metering unit. Close the seed hopper cover. Disconnect hydraulic hoses and electrical lines and hang them in the holders. Unhitch the machine. Store switch and display box for the HORSCH DrillManager in a dry place. 22

27 Technical data Sprinter 4 ST Dimensions/weights Length: m Length with PE marker: m Working width: m Transport width: m Height: (seed hopper) m Height: (fertiliser tank) m Height: (hopper extension) m Transport height: machine plus max m Empty weight:... from 3,400 kg upwards Axle load tyre packer:... 2,300 kg Nose weight:...1,100 kg Tank volume: (seed hopper)... 3,000 l Tank volume: (fertiliser hopper 40:60).. 3,800 l Standard version Number of coulter rows:...3 Number of coulters:...16 Coulter spacing: mm Sowing depth: mm Metering unit drive:... electronic Metering: kg/ha Hydraulic fan:...3,500 rpm Tractor power required Tractor power: KW/140 HP Hydraulic pressure: bar Additional equipment Hopper extension 700l: PE marker: or Rear harrow: Piping system for Duett coulter: Seed flow monitor: Air pressure, PU tyre: Operating permit: Sprinter 6 ST Dimensions/weights Length: m Length with PE marker: m Working width: m Transport width: m Height: m Transport height: machine plus max m Empty weight:... from 5,200 kg upwards Axle load tyre packer:... 3,500 kg Nose weight:...1,700 kg Tank volume: (seed hopper)... 3,000 l Tank volume: (fertiliser hopper 40:60).. 3,800 l Standard version Number of coulter rows:...3 Number of coulters:...24 Coulter spacing: mm Sowing depth: mm Metering unit drive:... electronic Metering: kg/ha Hydraulic fan:...4,000 rpm Tractor power required Tractor power: KW/180 HP Hydraulic pressure: bar Additional equipment Hopper extension 700l: PE marker: or Rear harrow: Piping system for Duett coulter: Seed flow monitor: Air pressure, PU tyre: Operating permit:

28 Hydraulic connection 1x double-act. + float position:...lifting, bout marker 1x double-acting:... fold 1x single-acting + flow-control valve:...fan 1x freeflow return line, depending on equipment:...fan return line Tyres Packer:...185/ AS profile Front support wheel: / AW Tyre pressure Packer: bar Front support wheel: bar Setting torques Packer bolt 10.9: Nm Packer bolt 8.8: Nm Wheel nut front support wheel: Nm Requirements regarding operating permit Sprinter 4 ST Permissible total weight:... 6,800 kg Permissible axle load:... 5,000 kg Permissible nose weight:... 2,300 kg Minimum tractor power: kw Minimum tractor weight:... 6,200 kg Sprinter 6 ST Permissible total weight:... 8,400 kg Permissible axle load:... 6,000 kg Permissible nose weight:... 2,900 kg Minimum tractor power: kw Minimum tractor weight:... 7,500 kg Emissions Hydraulic fan Fan, measured at rated speed: Highest value on the envelope curve at a distance of one metre from the fan. Fan:...98 db (A) 24

29 Settings / Operation Sprinter Footrests Drawbar Front packer Tines with Duett coulters Harrow Rear packer Rear harrow PE marker Road lighting equipment Fan Double hopper with cover Description The pneumatic drill is predominantly used after minimum cultivation soil preparation. The streamlined coulters and the high operating speed allow large areas to be covered, even with small tractors. Different coulters and equipment options enable its use with all types of seed and any soil conditions. The electronic DrillManager controls and monitors all seed-flow components. The metering unit is operated and controlled electrically. The seed and/or fertiliser quantity selected is distributed irrespective of the driving speed. 25

30 Tines The Sprinter 4 ST is optionally equipped with the tried and tested Classic tines or the new MultiGrip tines. In the Sprinter 6 ST, MultiGrip tines are standard equipment. Both versions are maintenance-free and can be equipped will all coulter types. Classic tines MultiGrip tines 26

31 Duett coulter - liquid fertiliser The Duett coulter is a combination seed and fertiliser coulter. Duett coulter - dry fertiliser The Duett coulter is a combination seed and fertiliser coulter. Duett coulter 30 - liquid fertiliser The point of the Duett coulter opens up the soil. The liquid fertiliser is then applied via a stainless steel pipe. The bottom plates firm the seed channel and simultaneously cover the fertiliser channel with soil. The seed then comes out of the distributor and is placed above the fertiliser. The fine soil falls onto the seed behind the bottom plates. The soil is then consolidated by the packers. The Duett coulter for liquid fertiliser is available in two versions, with approx. 30 mm or 5 mm space between the bottom plates and the fertiliser outlet. Both coulters are available in a narrow and a wide version. The bottom plates are available in a metal and a plastic version, the wear points in a standard version and with a hard-metal point. Duett coulter 30 - dry fertiliser The point of the Duett coulter opens up the soil. The fertiliser is then applied to the soil. The bottom plates firm the seed channel and simultaneously cover the fertiliser channel with soil. The seed then comes out of the distributor and is placed above the fertiliser. The fine soil falls onto the seed behind the bottom plates. The soil is then consolidated by the packers. The metal bottom plates are available in two versions, the wear points in a standard version and with a hard-metal point. 27

32 Checks The angular brackets on all Duett coulters must be aligned vertical to the distribution heads and fastened in place to ensure uniform seed distribution on both sides. HORSCH Delta coulter The coulters are fastened on a spring-mounted tine by means of an adapter. The seed pipe is attached behind the coulter and the spreader plate. When sowing, the seed is blown through the seed hose, the seed pipe and the distribution head and deposited under the wing of the coulter in the form of a wide band. The sowing width is between 10 and 17 cm. Angular brackets on Duett coulter Replacing the Duett-coulter points The points of the Duett coulter are secured with a roll pin. When changing the coulter points the coulter bodies must not be struck when driving in the roll pins. Delta coulter The 30 cm wide coulters are suitable for sowing most types of seed. The points are very hard and are, consequently, prone to fracture if struck. Therefore, use appropriate tools and devices to drive in the dowel pins. Protective goggles and gloves are needed for personal protection. The points of the Duett coulters are secured by means of hexagon-socket imperial bolts. A 7/32 Allen key is needed for this. 28

33 HORSCH Alpha coulter The Alpha coulter can be used for heavy soils instead of the Delta coulter. The Flexboot distributor is used to adjust the sowing width. HORSCH Solo coulter The Solo coulter has been developed to sow beans and soybeans. These plants require a loose seed bed around the seedling. Alpha coulter with Flexboot distributor Flexboot distributor The Flexboot cover limits the sowing width. In the case of the Alpha and Delta coulters, it can be attached behind the tine. Solo coulter The Solo coulter ensures precise grain distribution and prevents the grain rebounding. Flexboot seed distributor Apart from the Flexboot cover, the air volume also has an influence on the sowing width. A too high air flow blows the grain out of the seed furrow and scatters the seed. 29

34 Grubber clip-on point The clip-on point can be mounted when using the machine as a cultivator. Depending on the tines fitted, the appropriate adapters must be mounted. Caution: Wear protective goggles! Metal or paint splinters can chip off and injure you when hammering the points on and off. To accommodate the coulters, a tappered wedge is bolted onto the tines and the clip-on point hammered onto or off this. The wedge is equipped with a securing device. This securing device must be pressed back with an unlatching tool in order to dismantle these coulters. Clip-on points The clip-on points are available in widths of cm for different applications. Clip-on point with unlatching tool 30

35 Harrow A two-row harrow, or the Y-harrow is fitted in front of the rear packer. The harrow distributes the crop residues in front of the packer and levels the soil. The Y-shaped tines are mounted on a trailing tine Y-harrow Two-row harrow Due to the special suspension, both harrow arms can move upwards independently. Adjustment The angle of the two harrows can be adjusted via the pin (1). Both rows can be set the same or, in the case of high crop residues, the front row can also be set at a flatter angle. The limit stop (2) restricts the harrow when in work. When set lower and flatter, the harrow can project beyond the permissible transport width. Therefore, prior to driving on the road, set the limit stop (2) at an appropriate height to ensure that nobody is endangered or injured during transportation. The Y-harrow has parallelogram suspension. Therefore, the angle of the tines remains the same even when the height is changed. Adjustment The angle of the two harrows can be adjusted via the pin (1). The limit stop (2) restricts the harrow when in work. When set lower and flatter, the harrow can project beyond the permissible transport width. Therefore, prior to driving on the road, set the limit stop (2) at an appropriate height to ensure that nobody is endangered or injured during transportation. 31

36 Rear harrow The harrow removes tyre tracks and spreads any harvest residues. The angle (1) and the depth (2) of the harrow are adjustable. If there is a large percentage of residues, set the harrow a little flatter and to level the soil, set the tines at a sharper angle. Rear packer The packer consolidates the soil. The tyres with an agricultural tractor tread leave an even and water-permeable seedbed. Two packer tyres are mounted in a tandem formation. As a result, rough ground is compensated for and not transferred to the machine. This ensures smooth and uniform seedbed following. 2 1 Rear harrow Pay attention to the transportation width in transportation position. The harrows must not endanger or injure other road users. The harrow arms can pivot in the longitudinal holes and the tines can turn outwards. This could cause the transportation width to be exceeded. Therefore, set the depth (2) in such a way that the arm pivots within the transportation width, or fasten the tines in a flat position with a bolt. Remove these bolts again before operating the machine. Tandem packer In transport position, the two outer packers are folded and the middle packer bears the weight of the machine. The tandem axles are supported between polyamide discs. These are subject to wear as a result of the reciprocating motion and must be readjusted or replaced if necessary. If consolidation is not uniform, check the height of the packer and adjust the folding limit stops or cylinders if necessary. Maintenance: The tandem axles should move smoothly but not tightly. Check the polyamide discs for wear and replace if necessary. Lubricate the wheel hubs, packer-frame bearing and folding pins. Check air pressure: bar Check screwed connections for tightness. 32

37 Front packer A continuous packer or an intermediate axle packer can be installed at the front to level and prepare the seedbed. Front support wheels The front support wheels support the side section and stabilise the entire machine when sowing. Front packer Front support wheels Maintenance: Lubricate wheel hub. Check air pressure: bar Check screwed connections for tightness. Intermediate axle packer In the version with intermediate axle packer, additional support wheels can be mounted on the side sections of the Sprinter 4 ST. They are always installed in the intermediate axle packer version of the Sprinter 6 ST. Maintenance: Lubricate packer-shaft bearing. Check air pressure: bar Check screwed connections for tightness. 33

38 Bout marker No-one is to remain within the operating range of the bout marker. There are shearing and crushing points on all moving components. Operation When unfolding the bout markers, the spool valve must be actuated until the bout markers have unfolded completely. Then reset the spool valve in the neutral position. Bout marker hydraulics The bout markers are connected to their own spool valve and are also hydraulically connected to the lifting circuit. The bout markers can be operated by their own spool valve or can also be controlled when lifting (see hydraulic circuit diagram). A switchover from one to the other option can be made via the two shut-off valves. Setting the coulter disc The action of the coulter discs can be set and must be adjusted to the soil conditions. To do this, unscrew the clamping screws on the bout-marker arm and turn the shaft until the desired marking angle has been reached. Maintenance Lubricate bout-marker disc. Lubricate pivot point on the frame. Pivot point, bout marker 34

39 Fan direct drive Depending on the equipment, different fan motors are being fitted. The hydraulic fan is directly driven by the hydraulic system of the tractor. To control the fan speed, the tractor must be equipped with a flow-control valve. The hydraulic pump must deliver sufficient oil to prevent the fan speed dropping even when the tractor speed drops or other hydraulic functions are activated. Fan motor The return line must be connected to the tractor through a freeflow return. The return line pressure must not exceed max. 5 bar! The air flow generated conveys the seed from the Venturi pipe to the coulters. The required airflow is determined by the seed type, weight and quantity. The air flow is set via the flow-control valve on the basis of the fan speed. It must be strong enough to prevent seeds blocking the pipes and causing blockages. Fan motor 1 Seed transportation and seed placement must be checked on all coulters when beginning sowing and regularly from time to time in the case of large areas Fan drive hydraulics Hydr. valve with flow control Hydr. coupling Pressure gauge Hydr. motor Fan Adjustable pressure relief valve 35

40 Fan motor with pressure-free return line The return line must be connected to the tractor through a freeflow return. The return line pressure must not exceed max. 5 bar! Fan motor The fan impeller and the guard must be checked regularly for dirt deposits and cleaned. Deposits on the guard lead to blockages in the seed pipes to a lack of air flow. Deposits on the impeller cause imbalance. The bearing will be overloaded and can be damaged. Checks and maintenance Ensure that the return line pressure is max. 5 bar. Clean the air intake grill regularly to prevent the stream of air from decreasing in volume and thus prevent blockages. Clean any dirt or deposits from the fan blades to prevent imbalance occurring as this can damage the impeller wheel and bearings. Re-tighten conical clamp on the fan shaft (see chapter Fan Flange) Functional diagram, hydr. fan Hydr. valve with flow control Hydr. coupling Pressure gauge Hydr. motor Fan Non-return valve Oil return line Depressurised hydr. connection to the tractor 36

41 Fan with PTO pump The hydraulic fan is driven by a power take-off pump. The fan speed increases proportionally to the hydraulic pressure. Function The PTO pump drives the hydraulic fan motor. The high-pressure gauge shows the operating pressure in the hydraulic system. This increases in proportion to the fan speed and should be between 50 and 130 bar Fan with power take-off drive 8 7 The oil is returned to the oil tank through the cooler and a filter. The pressure relief valve in the hydraulic block protects the components and a non-return valve allows the fan to continue running after the power take-off has been disengaged. A pressure gauge in the return line monitors the banking-up pressure. The filter must be replaced when the return-line pressure exceeds 2 bar. It is necessary to clean the cooler vanes regularly in order to maintain the cooling and fan air flow levels. This prevents the hydraulic oil from overheating and the seed pipes from becoming blocked Power take-off pump Hydr. block with pressure relief and non-return valves High-pressure gauge Hydr. motor fan drive Fan Pressure gauge, return line pressure (max. 2 bar) Cooler Filter Oil tank When connecting, the power take-off pump is slipped onto the shaft stub. The pump must then be secured to the tractor, free of tension, by means of the clips. The pump must not move when in operation, otherwise the shaft and bearings could suffer damage. Technical data Absorption capacity P: 43 cm³ Absorption capacity M: 10 cm³ Operating pressure: up to 130 bar PTO speed: 1000 rpm Connections: Z 6, Z 20 and Z 21 Fan speed: rpm Checks and maintenance Ensure that the return line pressure is max. 2 bar. Check oil level. Clean fan guard and cooler vanes. Clean fan blades. Replace oil and filters if necessary. Re-tighten conical clamp on the fan shaft (see chapter Fan flange ). 37

42 Fan with PTO pump Fault Possible cause Remedy Damaged fan bearings Normal wear Fan has run at excessively high speed Impeller wheel imbalanced Replace the bearings Never operate the fan without the pneumatic hose connected Replace the impeller wheel or clean it if dirty Shaft seal on the motor leaks Return line pressure over 2 bar Check the return line pressure Hydr. oil overheats Hydr. motor defective PTO pump bearing defective No air flow at the coulters Air lines block up Fan has run at excessively high speed Dirty oil filter Fan guard dirty Oil cooler dirty Pressure relief valve set too low Fan has run at excessively high speed Hydraulic oil dirty Pump was fitted under tension or not fitted securely to the tractor Regulating valve on the fan is closed Air intake grill is dirty Reduce pressure and check oil level Check the pressure at the fan Change oil and oil filter Clean the fan guard Clean the cooler vanes Correct pressure valve Reduce power and check the pressure at the fan Change hydraulic oil and filter Replace bearing, fit pump securely, without tension Open the regulating valve Clean the air intake grill 38

43 Re-tightening the fan impeller The conical clamp on the hydraulic motor fan drive can become loose due to temperature fluctuations and material deposits on the impeller. The impeller can creep along the drive shaft and destroy the fan. The inch screws in the version no must be tightened to a max. torque of 6.8 Nm. After tightening, check the impeller for free and uniformly smooth running. The conical clamp should, therefore, be re-tightened after approx. 50 operating hours and checked once per year. To do this, the fan guard must be removed. The conical clamp fixes the impeller in position and, at the same time, clamps firmly onto the drive shaft. Conical clamp When re-tightening the clamping screws, attention must be paid to the following. When tightening the screws, particularly when re-assembling, the impeller creeps towards the housing in the direction of the guard. Therefore a loose flange must be aligned closer to the hydraulic motor. The clamping surfaces must be free of oil and grease. The clamping bolts must be tightened as evenly as possible in several steps. In between, tap the flange lightly (plastic hammer or hammer handle) to facilitate mounting on the cone. 39

44 Distribution head The distribution head is mounted on the front of the seed hopper. This directs the seeds to the coulters. In the version with double hopper, both distribution heads are mounted at the front. All components of the distribution head must be airtight. Even minor leaks and air losses lead to uneven seed distribution. Hopper The hopper can be designed as a single hopper for seed, or as a double hopper for seed and fertiliser. The single hopper has a volume of 3,000 l and can be extended by 700 l by means of an additional extension kit. The double hopper is divided at a ratio of 60:40 and has a total volume of 3,800 l. In order to protect the seed from dirt, dust and moisture, the cover should always be closed. The seed can be distributed and the hopper completely filled when the slider is installed. If the machine is folded in order to refill, release the folding lock prior to unfolding. Distribution head, double hopper If the machine is equipped with a dry fertiliser system, the hoppers must not be confused, pay attention to the pipe routing if necessary. The front pipes on the Duett coulters are for the fertiliser and are connected to the fertiliser hopper. Check the distribution head for foreign objects at regular intervals. These inhibit the seed flow and operation of the solenoid valves. Double hopper If seed only is to be distributed with a double hopper, a section of the partition wall can be removed and the entire hopper volume used for seed. 40

45 The partition wall is accessible via the side cover on the rear hopper and can be removed quickly by means of knurled screws. In addition, the entire fan air flow can be redirected to the metering unit concerned. To do this, loosen the wing nut on the distribution pipe, change the position of the valve and retighten the nut. Changing the hopper partitioning The hopper is partitioned into a ratio of 60% for seed and 40% for fertiliser. If the reverse partitioning is needed, the hoses from the Venturi pipes to the distribution heads can be exchanged. Unscrew the two hoses on the Venturi pipes. Unscrew the four screws on the manifold. Loosen the two heads and turn slightly inwards. Screw on the manifold and then fasten the head. Fasten the hoses on the Venturi pipes crosswise and lay them in such a way that the tines can still rebound without damaging the hoses. Distribution pipe After sowing, re-install the partition wall and fix the valve in the middle position again. Interchanging the hopper partitioning Check the manifold and hoses for airtightness. 41

46 Venturi-type injector The metering unit injects the seed into the air flow via the Venturi-type injector. A cover is mounted underneath to allow the seed to be removed during calibration. When sowing, all connections and the cover must be airtight. Air leaks lead to metering errors. Air separator An air separator is installed at the transition point between the hose and the distribution head. Due to the air exhausted, the air separator increases injector capacity and, thus, allows a higher seed rate. In order not to impair operation, the holes must be open. Particularly in case of large seed rates regularly check that air can be freely exhausted through the holes and remove any deposits. At the same time, also check to seed hoses and distributor head for blockages. Venturi-type injector Air separator 42

47 Metering unit The HORSCH metering unit comprises of only a few individual components and can be dismantled without tools. 8 1 Different metering rollers are available for sowing different grain sizes and seed quantities. The rollers are selected according to the table in the section entitled calibration test. The metering rollers are classified according to the output per revolution. 7 2 Rollers for all types of grain Metering unit Emptying outlet with rubber sealing strip Housing Drive motor Side cover for pressurised hopper with scraper plate Side cover for pressurised hopper with rape brushes Side cover for standard tank with rape brushes Roller Side cover with roller bearing Metering rollers No. Size cm³ Colour Recess ø mm Depth mm No. of recesses 1 30 dark blue red black blue black black honey metal When working on the metering unit, it must always be ensured that the components are absolutely airtight. Leakages lead to metering errors. When assembling the metering unit, the mating surfaces must be sealed, and the housing must not be subject to tension when being attached. 43

48 The base of the metering unit is shut off from the Venturi pipe. In the Venturi pipe, the seed is transported by the stream of air. When calibrating, the seed is removed from the metering unit via the opening in the Venturi pipe. The cover must then be firmly closed and sealed once again. Roller replacement After the roller has been selected from the table, it must be installed in the metering unit. When replacing the roller, the seed hopper should be empty. Unscrew the side cover. Pull out the roller together with the drive shaft. Roller replacement Check that the rubber sealing strip is set correctly and that the roller runs true every time a roller is replaced. Roller replacement with a full hopper Roller replacement Remove the circlip and plain washer. Pull out the drive shaft and insert it into the new roller. Axial play of the drive shaft in the roller is necessary for self-cleaning the roller when installed in the metering unit housing. Roller replacement with a full hopper Unscrew wing screws on the side cover and drive motor, then remove the side cover and motor. Remove circlip and plain washer from the drive shaft. Insert the drive shaft into the new metering roller thus pushing out the old roller on the motor side. Remove the drive shaft from the old roller and install it in the new one; fit the side cover and motor and fasten in place. 44

49 Checking rubber sealing strip A defective sealing strip or incorrectly fitted support plate will lead to metering errors when sowing. The sealing strip must not be torn or damaged, replace if necessary. Fit the side cover with sealing strip to the metering unit housing. The rubber sealing strip must make good contact with the roller. Roller for sowing small seed The rollers for sowing small seeds comprise metering discs, spacers and drive shaft. In order to prevent problems when sowing small seed, the metering rollers are completely preassembled in the factory. Rollers for sowing small seed Sealing strip The mounting plate for the sealing strip is divided asymmetrically. The broad side must be towards the roller for all normal and small seeds. For large seed, like maize, beans, etc., the narrow side must be towards the roller. Rollers for sowing small seed The rollers can be fitted with one or two metering discs. Two metering discs on a roller will double the delivery rate. Metering discs are available with a delivery rate of 3.5 cm³, 5 cm³ and 10 cm³. Size cm³ Cell shape / Cell size Number of cells 3.5 half round, 4mm radius x 3.5 cm³ discs 20 5 Slots, approx. 19 x 3 mm x 5 cm³ discs Slots, approx. 23 x 5 mm x 10 cm³ discs 24 When sowing is in progress, only the metering discs rotate in the roller. The spacers are prevented from turning by stops on the housing. 45

50 When fitting or removing the rollers, the stops must be turned so that they are in line with the slot in the housing. Then fit the circlip. If the roller has been assembled correctly, the metering discs between the spacers can just be turned freely. The parts must not rub against each other but the play should be kept to a minimum. When held against the light, the gap should only just be visible. Functional test After installation, the new roller must be tested for proper operation and true running. For this purpose, switch on the roller as described under Calibration Test. Roller assembly for sowing small seed Assembly instructions: So that seed cannot force its way between the metering discs and the spacers, the metering discs and spacers are installed without play using shims. Bearings are built into the spacers. Depending on the manufacturing tolerance, shim washers are inserted to prevent the spacers from rubbing on the metering discs. The drive motor must run uniformly true. No sluggish points should be audible. If the motor does not run true, metering will be inaccurate and the motor can be overloaded. Locate sluggish points if possible. Rework (grind, turn off in a lathe...) or replace damaged components. Slacken off the screws on the side covers, drive motor and roller bearing and adjust the side covers to remove any tension. If the drive shaft is bent, straighten or replace it. Foreign bodies are jammed between the roller and the housing - remove the foreign bodies. If dust or dressing has penetrated between the metering discs and the spacers, dismantle and clean the roller. Roller for sowing small seed After all components have been assembled, the space remaining up to the circlip is packed with shims. 46

51 Rape brushes The rape brushes clean the metering discs in the roller for sowing small seeds. Prior to sowing small seed, the rape brushes must be installed in the rear cover and tested for correct operation. Large seed In the case of large seed (maize, beans, peas, etc.), a deflector is installed instead of the rape brushes. This deflector prevents large seeds from becoming jammed and ground up between the roller and the housing and from blocking the roller. Rape brushes fitted Check for true running and correct securing. Check the condition and cleaning efficiency of the brushes. Fit the side cover with brushes into the metering unit. The brushes must make good contact with the metering discs and rotate with the roller. Deflector A high partition plate is installed in some metering units. This plate must be cut off at the lower edge of the inspection window to enable the scraper to be installed. The rape brushes must be checked for function and cleaning efficiency prior to commencing sowing and then at regular intervals. Clogged metering discs cause metering errors when sowing. Fewer seeds are distributed. The side cover with the rape brushes can also be removed when the seed hopper is full. At the same time, clogged metering discs can be cleaned in situ. The rape brushes should be removed when sowing normal-size seed. The bolt holes must be closed again. 47

52 Venturi-type injector The metering units in machines with standard tank and Venturi-type injector are equipped with a V2A cover with recesses. When in operation, a vacuum is created in the injector nozzle. Due to this V2A cover, additional air is delivered to the air flow. In extreme cases, the vacuum can block the flow of seed in the tank and cause the seed being metered to stop. Therefore, always check that the pneumatic system is functioning properly and that seed is being distributed correctly, particularly in the case of large seed quantities and high working speeds. No seed must lie on the surface of the field. If seed is being blown out, the working speed must be reduced until the injector system is again operating correctly. Metering unit with cover for injector nozzle Adjustment of the injector nozzle to the cover functions up to a max. possible seed quantity. If this quantity is exceeded, dynamic pressure develops at the injector nozzle. As a result, seed can be blown out through the mesh screen, which leads to the seed being deposited in rows in the centre of the machine. These seeds are visible on the surface of the field before they are covered by the packer or harrow. 48

53 Metering unit maintenance The metering unit requires no special maintenance. To avoid repair-related downtimes, the metering unit and drive motor should be cleaned at the end of the season and checked for correct function. In particular, the bearings in the side cover and on the drive motor can be damaged and/or become sluggish as a result of dressing dust. Replace the bearings in good time if necessary, or keep a stock of spare bearings. 2 1 Plug pin assignment on the motor module with screened grey cable Pin No. Cable 1. orange and blue 2. white and white/black or white and brown 3. black 4. red 5. green 6. screen Plug pin assignment on the motor module with screened black cable Pin No. Cable 1. black 2. white 3. blue 4. brown 5. yellow 6. screen Drive motor Screws Shaft seal and bearing Plug pin assignment on the motor Cables can be soldered back on if a cable breaks or the plug has to be repaired. However, the use of crimp contacts is recommended. These are standard fitting in the case of newer versions. Pin No. Cable 1. black (thick) 2. white 3. black (thin) 4. red 5. green 6. not used 49

54 Calibrating the seed/fertiliser quantity Perform calibration only when the machine has been lowered and is stationary. Do not use sticky dressings with seed. These influence the metering accuracy. Check seed and hopper for foreign objects. Depending on the seed, install the rape brushes or the deflector. Check all side covers on the metering unit. Install the appropriate roller for the seed quantity and check for true running. Check sealing strip for condition and correct setting. Place seed / fertiliser in the hopper. Open the outlet on the Venturi-type injector and fit the calibration bag. Calibrate machine (see DrillManager). Close the flap. Ensure that it is airtight! Sowing depth During sowing, the machine is supported at the rear by the packer and, depending on the equipment, at the front by the packer, intermediate axle packer, or support wheels. The sowing depth is defined by the depth setting on these components. Basic setting Hitch up machine, unfold it on a flat surface and lower it to the ground. Switch the hydraulic system to float position. Fill the piston rods on the lifting cylinders at the rear and the guides at the front with the same number of spacers of the same thickness (colour combination). Fill the adjusting rods at the front with spacers at all adjusting points, including the upper section, in order that the packers will also be lifted when lifting. Rear lifting cylinder, Sprinter 6 ST Venturi-type injector If the machine is calibrated when folded, there is a risk of injury in the area of the head and eyes. Wear appropriate protective clothing. 50

55 If the length of the cylinders up to the limit stops on the piston rods differs, the forks on the piston rods must be repositioned until all are the same length and the same combination of spacers can be inserted. If the locators for the spacers at the front adjusting points are not the same, the plates on the adjusting spindles must be re-adjusted. Check basic position Lift the machine completely and insert an additional, narrow spacer at all adjusting points. Then lower the machine to the limit stop and switch to float position. All coulters must be at the same level. Correct the setting if necessary and remove the additional spacers again. Setting the sowing depth The basic setting = 0 cm sowing depth. Based on this setting, the same spacers must be removed at all adjusting points according to the desired sowing depth. The adjustment ratio is approx. 2.5:1. If a 1 cm spacer is removed, the machine is lowered by approx. 2.5 cm. Depth setting at the front of the packer Unscrew the locknuts on the spindle and turn until the same combination of spacers as at the rear can be inserted. Retighten the locknuts. The diagrams on the hydraulic cylinder show the colour combination for the next possible depth setting. Each step corresponds to a height adjustment by approx. 8 mm. To achieve uniform sowing, the machine must be aligned in operating position. After sowing a few metres, the working depth and the seed depth must be checked. Particularly if machines are equipped with support wheels at the front only, and in the case of soft soil, the machine can sink in deeper at the front and necessitates a correction of the height setting. The sowing depth and horizontal adjustment of the machine must be checked before beginning work and, in the case of large fields, also from time to time. Depth setting on the support wheel 51

56 Work instructions Driving speed With the Sprinter ST, driving speeds of up to 15 km/h are permissible. This depends on the field conditions (type of soil, crop residues, etc.), the seed, seed quantity, the coulters, and other factors. If conditions are difficult, drive more slowly. With certain types of coulter, a stepping effect can develop at high driving speeds. In this case, the soil from the front coulter is thrown over the middle of the following coulter. The result is an uneven seedbed and a non-uniformly deep seed coverage. After sowing: After sowing, the seed and fertiliser hopper and the metering unit should be emptied and cleaned. The seed and dressing could become damp overnight and become lumpy. This can lead to bridge formation in the seed hopper and to clogging of the roller recesses. This causes metering and sowing errors! Park the drill on level ground. Empty the seed / fertilizer into a container via the outlet on the hopper or via the cover (with the sealing strip) on the metering unit. Seed distribution: If, in the case of hard soil, the tines constantly move in the stone protection area, seed distribution will be uneven. The soil must then be prepared deeper or more finely. Driving tracks: If the seedbed has been loosely prepared and there are deep tractor tracks, plates can be inserted at the tines in the area of the track so that the tines penetrate more deeply in the area of the track. Turning: When sowing, the speed should be reduced shortly before the machine is lifted in order to prevent the fan carrying capacity from dropping and causing the pipes to become blocked. Raise the machine while driving. Emptying outlet Unscrew the side covers on the metering unit, turn the roller manually and clean with a brush. Clean all components thoroughly after using fertiliser. Fertilisers are aggressive and cause corrosion. After turning, lower the machine approx. 2-5 m ahead of the seedbed with the appropriate fan speed. It takes a little time for the seed to be carried from the metering unit to the coulters. 52

57 Checks The sowing quality essentially depends on the adjustments and checks made prior to and during sowing, as well as on regular servicing and maintenance of the machine. Therefore, the relevant maintenance and adjustment work should be performed prior to commencing sowing and all lubricating points lubricated. Checks prior to and during sowing Machine: Has the machine been hitched up correctly and are the coupling devices locked? Have the hydraulic pipes been connected unambiguously? Have the tractor link arms been locked to reduce sideways movement? Have the folding locks been latched in place for driving on the road and is the road lighting equipment functioning correctly? Has the operating position of the hydraulic folding system been pressurised with bar or bar, respectively? Have the limit stops for folding been set correctly? Have the bout markers been set to the correct length? Has the machine been aligned evenly in the operating position and the sowing depth set correctly? Is the machine operated in float position when sowing? Has the partition wall been installed in the double hopper? Cultivation tools: Are the coulters, harrows and other cultivation tools and additional equipment still in a serviceable state? Are the packer wheels and packer bearings in good order? Have the angular brackets on the Duett coulter been aligned vertically to the distribution heads and are all hose connections airtight? Fan: Is the hydraulic fan connected to an unpressurised return line? Depending on the fan design, is the regulating valve open and, in the case of the double-hopper version, is the air valve in the distribution head in the middle position? Pneumatic system: Are the solenoid valves installed in the correct seed pipes for the tramlines, has the tramline rhythm been set and do the solenoid valves operate? Are the seed pipes not sagging and are they free from water and other deposits? Are all air lines from the fan to the coulters airtight and firmly connected? Does air flow out of all coulters uniformly? Has the air volume been set correctly on the fan? Does the seed bounce out of the seed furrow, or remain in the pipes and block these? Is the air separator on the head free of blockages and deposits? Metering unit: Have the sealing strips in the metering unit been adjusted and are they still serviceable? In the case of small seed, has the cleaning brush been installed and is it in order? In the case of large seed, has the scraper plate been installed? Are all connections airtight and has the emptying outlet been closed firmly and tightly? Is seed coming out of all the coulters? Are bridges forming in the hopper (particularly in the case of non-smooth seed)? Is, particularly in the case of small seed, the correct seed quantity being distributed? When sowing, the checks must be carried out before starting work and in the case of larger fields, at regular intervals during work! 53

58 HORSCH PPF system Function With the liquid fertiliser system, the fertiliser is applied together with the seed. The liquid fertiliser is sucked by the centrifugal pump via a filter. It passes through the control valve, shut-off valve and flow sensor. It is then conveyed, via the piping system, to the HORSCH Duett coulters and then to the seed bed. An appropriate fertiliser tank with a volume of approx ,000 litres must be mounted on the tractor. The setting data for metering the fertiliser apply to the properties of AHL fertiliser. The settings may have to be changed in the case of other types of fertiliser. The max. deliver pressure is limited to 7 bar. The operating pressure of 3 bar should not be exceeded with a max. driving speed of 15 km/h Danger of frost damage! After sowing has been completed in autumn, all components filled with liquid must be emptied. Liquid fertilisers are aggressive substances! Follow the manufacturer s safety instructions. If swallowed, or in case of contact with the eyes, consult a doctor immediately. If different types of fertiliser are applied, the system must first be flushed out. Different types of fertiliser react with each other and can lead to faults. 9 Diagram of liquid fertiliser system Drive for the hydraulic motor mounted externally or integrated in the fan drive Liquid fertiliser tank Shut-off valve Filter Venting pipe Hydr. motor with centrifugal pump Control valve Shut-off valve Flow meter Outlet to the coulters 54

59 Liquid fertiliser pump The centrifugal pump is maintenance-free. It is hydraulically driven from a control unit. The pump is self-priming. The venting pipe must be routed back into the tank. Flow meter The flow meter measures the fertiliser quantity and transmits the data as control basis to the DrillManager. The centrifugal pump must never run dry, otherwise the seal will be destroyed. Control valve The valve controls the flow according to the preset fertiliser quantity. The valve itself is controlled via the Drill Manager (electronic drill control system). Shut-off valve The shut-off valve shuts off the flow: When lifting the machine. Immediately the liquid fertiliser quantity is set to 0. When the DrillManager is switched off. Flow meter (Fig. SW) The flow meter must be dismantled each day, flushed with water and cleaned with compressed air (max. 1 bar). The sensor should also be removed every 50 operating hours, and the impeller wheel placed in a cleaning bath for several hours. Then check the impeller wheel. It must be able to rotate uniformly and smoothly. Control and shut-off valve 55

60 Operation Nozzle disc selection The table has been prepared on the basis of the flow rate for water at 3 bar and adjusted to the consistency of the liquid fertiliser. Due to the different types of fertiliser, the table can only serve as a guide. Liter / ha Nozzle disc selection Geschwindigkeit km/h In the fringe area of two colours, the driving speed and the consistency of the liquid fertiliser must be reconsidered. If in doubt, install the larger discs. A too high pressure subjects the pump to unnecessary strain and the desired application rate may not be achieved. When the pressure is too low, uniform distribution is no longer ensured. Maintenance: At the end of the season and in the case of longer periods of non-operation, all fertiliser system components must be thoroughly flushed out with water. Frost hazard! After sowing has been completed in autumn, all components filled with liquid must be emptied. Fill the tank with water and flush out the system. Empty the hopper, pipes, filter and the pump. Open the bottom screw plug on the pump and allow the water to drain. Open the anti drip valve on the nozzle bodies and allow it to run dry. Selection: Find the desired fertiliser quantity in the left column (l/ha) and mark a horizontal line. Define the planned driving speed in the bottom column (km/h) and mark a vertical line to this. The colour at the point of intersection of the two lines corresponds to the nozzle discs that should be used. 56

61 Before sowing: Has all maintenance work been performed on the liquid fertiliser system? Are the coulters, bottom plates, etc. still in order and is the outlet hole on the fertiliser pipes free? Has the fertiliser quantity been adjusted? Have the correct nozzle discs been selected and fitted? Has the liquid fertiliser tank been filled? Is liquid emerging from every coulter? Is the operating pressure between 1 and 3 bar? Are all pipes and screwed connections airtight? If the operating pressure increases to more than 3 bar, reduce the driving speed. Check the size of the nozzle discs and install larger ones if necessary. Clean the outlet on the coulters. Check the mesh filter in the nozzle bodies and main filter. Replacing the nozzle discs: The nozzle discs are installed in the nozzle bodies on the coulters. These must be selected from the table according to the application rate and installed prior to commencing work. Nozzle discs Open the bayonet catch. Remove the filter, seal and disc. Fit the selected disc, together with the seal and filter. Install the same discs in all nozzle discs. Anti drip valve An anti drip valve is installed in the nozzle body under the side screw plug. After the pump is switched off, the anti drip valve closes the inlet and prevents the fertiliser pipe from running dry. The opening pressure of the anti drip valve is 0.5 bar. 57

62 Suction and mesh filters Clean the filter in the suction filter regularly. Clean the filter insert in the nozzle body regularly. 6 The suction filter can also be removed and cleaned when the tank is full. Flow is automatically shut off and dribbling prevented when the cover is opened. 7 Nozzle body 1. Bayonet catch 2. Nozzle discs Colour Flow rate at 3 bar per minute grey - 20 ml black ml orange ml red - 2,060 ml blue - 3,320 ml 3. Seal 4. Mesh filter 5. Nozzle body 6. Anti drip valve 7. Union nut Dummy plugs can be fitted to any fertiliser hoses which are not in use, e.g., when sowing maize. Maintenance: Check the mesh filters regularly for dirt and clean them if necessary. Check the hoses for chafe marks, replace damaged hoses if necessary. During periods of non-operation, after the season and in the case of fertilisers that tend to cause deposits, flush the system each day with water. Suction filter (Fig. CO 4) Flush out the filter inserts with water and carefully blow them through with compressed air. Then reinstall the filter inserts. If the filters in the nozzle bodies often become blocked, an additional pressure filter with reversible flow can be installed in the pressure pipe. Before changing the type of fertiliser, flush the PPF system with water. Some fertilisers are not compatible with others and react chemically. 58

63 Repairing the hydraulic fertiliser pump The residues in the pump can stick the ceramic slip ring (1) to the seal. As a result, the seal assembly no longer rotates with the shaft and the seal (2) on the roller will be destroyed. PPF system installation The piping system consists of a suction pipe from the tank to the filter and the pump and a pressure pipe (1 ) from the pump through the machine. 1 2 Hydraulic fertiliser pump Ceramic ring Sealing ring Therefore, when performing repairs, the sealing ring (2) should be coated on both sides with high-strength Loctite and installed. At the same time, the securing agent must not be pressed out of the shaft side, otherwise the spring-seal assembly will become glued to the shaft and no longer press on the ceramic ring. After installation, the agent should be allowed to dry for approx. 30 minutes before it comes in contact with the fertiliser. Piping system At the coulter frame, the pipes are branched off to the coulter points by means of T-joints and a pressure pipe (3/4 ) to the left and right and at each coulter, by means of a nozzle body and a pipe (1/2 ). Install the suction pipe from the tank to the filter. Install the suction pipe from the filter to the pump. Install the pressure pipe from the pump through the machine. Install two T-joints each for left and right at the transverse frame and blank off the end of the pipe with a T-joint. Screw a fixing plate onto each coulter clamping plate. Mount a nozzle body with an opening on each of the fixing plates and install a nozzle body endpiece on the last coulter in each row. Connect the nozzle bodies by means of pipes (3/4 ). 59

64 Install the pipe in loop at the folding section (folding movement of the frame section). Install the pipe (1/2 ) in a loop from the nozzle body outlet to the fertiliser pipe (take into account tine movement as a result of stone protection). Fasten all pipes tightly and so that they do not chafe using hose clamps. Install the pipes with sufficient play at locations subject to movement (stone protection, folding parts). Filter unit The filter unit is installed between the fertiliser tank and the pump. Install the suction pipe from the filter to the pump. Install the suction pipe from the filter to the fertiliser tank. In the case of the front tank, conduct the line in a U-rail under the tractor. The fertiliser tank should be as high as possible in order that the fertiliser automatically flows to the pump. The filter is equipped with an automatic shutoff valve. Remove the yellow valve body in the cover to shut off the flow. The cover can then be unscrewed and the filter removed. It is necessary to take out the filter regularly and carefully clean it with water and compressed air. 60

65 Service and maintenance Follow the safety instructions regarding service and maintenance. Your machine has been designed and assembled for maximum performance, economy and operator friendliness, under a wide range of operating conditions. Your machine has been tested in the factory and by your authorised dealer prior to delivery to ensure that you receive it in optimum condition. In order to maintain trouble-free operation, it is important that the service and maintenance work is always carried out at the recommended intervals. Cleaning In order to maintain readiness for use and to achieve optimum performance, always carry out cleaning and servicing work at regular intervals. Do not clean electrical components, fan or hydraulic cylinders with a highpressure cleaner or direct jet of water. The housing, screwed connections and bearings are not watertight. Clean the outside of the machine with water. Open the Venturi pipe under the metering unit so that water which has flowed in can drain away. Clean the metering roller in the metering unit with a brush. Purge the coulters, seed pipes, seed hopper, metering unit and fan with compressed air. If the machine has been operated with dry or liquid fertiliser, clean and flush the components thoroughly. Fertilisers are extremely aggressive and can cause corrosion. Maintenance intervals The maintenance intervals are determined by many different factors. For instance, not only do the different operating conditions, climatic conditions, driving and operating speeds, dust and type of soil, the seed, fertiliser and dressing used, etc., have an effect on the maintenance intervals, but the quality of the lubricating agents and care products also determines when the next service is due. The maintenance intervals stated can therefore only serve as a guide. In case of deviations from the normal operating conditions, the intervals for the relevant maintenance work must be adapted to the conditions. Preparation for storage If the machine is to be out of operation for a longer period: Park the machine under a roof, if possible. Empty the seed hopper and fertiliser tank completely. Open the emptying outlet. Disconnect the electrical control devices and store them in a dry place. Protect the machine against rust. Use only easily biodegradable oils, e.g., rape seed oil, to spray the machine. Relieve the weight on the wheels. 61

66 Lubricating the machine The machine should be lubricated regularly and each time it is washed with high pressure. This ensures readiness for use and reduces repair costs and downtimes. Hygiene Lubricants and mineral oil products are not harmful to health when used in accordance with the instructions. However, longer contact with the skin, or the inhalation of vapours should be avoided. Handling of lubricants CAUTION: Protect yourself against direct contact with oils by wearing gloves or applying barrier cream. Wash any traces of oil off the skin thoroughly with warm water and soap. Do not clean your skin with benzine, diesel fuel, or other solvents. Oil is toxic. If you have swallowed oil, consult a doctor immediately. Keep lubricants away from children. Never store lubricants in open or unlabelled containers. Avoid skin contact with oil-impregnated clothing. Change soiled clothing. Do not keep oil-impregnated cleaning cloths in pockets. Dispose of oil-impregnated footwear as special waste. Flush out any oil which has splashed into the eyes with clear water and consult a doctor if necessary. Soak up spilt oil with suitable bonding agents and dispose of it. Never extinguish oil fires with water, use only approved and suitable extinguishing agents and wear respiratory equipment. Oil-contaminated wastes and waste oil must be disposed of in accordance with the applicable regulations. Service We at HORSCH want you to be completely satisfied with your machine and with us. If you have any problems, please contact your local dealer. Our dealer s customer service personnel and the HORSCH customer service personnel are ready to assist you. We ask you for your assistance in order be able to remedy technical deficiencies as quickly as possible. Help our customer service personnel to avoid asking unnecessary questions by providing the following information. Customer number Name of customer service representative Name and address Type of machine and serial number Date purchased and hours of operation / area coverage Type of problem 62

67 Maintenance schedule Maintenance schedule Sprinter 4 ST and 6 ST After the first few operating hours Work instructions Interval All screwed and plug-in connections In operation Check for tightness and tighten screwed connections Fan Check for leaks, function, speed setting (pressure indication) in operation Fan guard Clean as required Impeller wheel Check proper attachment + condition and clean prior to use Tighten drive flange (first time 50 hrs) yearly Hydr. connections and hoses Check for leaks and chafing marks prior to use Fan with PTO pump Check oil level prior to use Pneumatic system Replace oil and filter (return line pressure exceeds 2 bar) 4 years Fan, seed hoses and Venturi pipe Check for leaks, kinks in hoses, chafing and blockages prior to use Distribution head Check for leaks and blockages prior to use Air-reduction insert Check for proper attachment and blockages prior to use Angular brackets on Duett coulter Check for proper attachment + vertical installation position prior to use Distribution hose (double tank only) Check that valve is in the centre position and tightly seated prior to use Metering unit Roller and sealing strip Check condition, setting and state of wear daily Motor bearing and housing cover Check for condition and smooth running prior to use Rape brush Check operation - dismantle if not in use prior to use Cultivation tools Tines and coulters Check for condition, tightness and wear prior to use Bout markers and PE marker Check for condition, tight seat, operation, smooth running prior to use Harrow tines Check for condition, tightness, setting and state of wear prior to use Hydraulic system Hydr. system and components Check for leaks, kinks in hoses, chafing + operation prior to use Packer Tyres Check condition, wheel stud tightness + tyre press. ( bar) prior to use Liquid fertiliser control system Filter (liquid fertiliser) Clean with water and compressed air as required Filter (at the nozzle discs) Clean with water and compressed air as required Flow meter (housing and impeller wheel) Clean with water and compr. air (thoroughly every 50 hrs) daily Complete machine Folding limit stops and setting Check setting prior to use Road lighting and warning plates Check condition and function prior to use Warning and safety labels Check that they are in place and readable prior to use At the end of the season Complete machine Complete liquid fertiliser system Complete machine After 3-5 years Carry our servicing and cleaning work Flush with water and drain the complete system before frosts are expected Spray with oil mist (cover rubber comp.), park under roof if poss. Hydraulic lines, lifting hydraulics Replace in acc. with machine directives App. I EN

68 Maintenance schedule Sprinter 4 ST and 6 ST Lubricating points (4 ST / 6 ST) Drawbar at swivel joint, two lower links (2) daily Folding frame pivot points on 4 ST (4) 50 hrs Folding frame pivot points on 6 ST (4) daily Folding cylinder pins (2 / 4) 50 hrs Rear packer arm bearing (2 / 6) daily Wheel hubs, rear packer wheels (1 each) 50 hrs Rear packer folding frame - only 4 St (2) 50 hrs Front packer centre packer, packer attachment (2) 50 hrs Front packer side packer, packer attachment (1/2) each 50 hrs Front packer shaft bearing per packer (2) daily Front support wheel bolts attachment (1) each 50 hrs Bout marker pin for attachment (1) per side daily Bout marker disc (1 ) per side daily 64

69 Lubrication points Drawbar pivoting and self-aligning bearing Wheel hub, rear packer wheels Folding cylinder and pin, folding frame Rear folding pins Packer ST 4 Pivot pins, rear packer arm and folding wings Centre packer + front folding wings pins 65

70 Front support wheel pivot pins and wheel hub Bout marker disc bearing Packer-shaft bearing Bout marker pivot point 66

71 Setting instructions 4 ST: Adjusting the folding limit stop and folding cylinder In working position, the folding frame must be parallel to the centre frame. The lower edges of the frame must be aligned. This can be checked visually or with a long straight edge. Ideally, the length of the folding cylinder is adjusted to the folding stops so that both limit stops fit tightly at the same time. Adjusting the folding limit stop on the packer frame To ensure uniform consolidation and depth control, the packer wheels must be at the same level. Folding limit stop, wing section Folding limit stop, side section Adjusting the folding limit stop Lift the machine. Insert spacers at the hydraulic cylinder to secure it. Adjust the limit stop bolts until both frames are parallel to the centre frame. Due to the compensation of tolerances in working position, it may be necessary for the frame to hang down slightly when lifted. Tighten the limit stop bolts. Adjusting the folding limit stop if necessary Unfold the machine and lower it to the ground. Loosen the locknut and turn the adjusting screw until the packers are at the same level. Retighten the locknut. Adjusting the length of the folding cylinder In unfolded position, loosen the locknut on the piston rod. Turn the piston rod until the rod length is in zero position in the cylinder and, in addition to the folding limit stop, holds the folding frame in the end position. Re-check the setting in working position. 67