Hydraulic Motors. Radial Piston Motors Precision drives with fixed displacement RM 80N... - RM 250N... series Vg = 80 ccm/rev ccm/ccm

Transcription

1 Hydraulic Motors Radial Piston Motors Precision drives with fixed displacement RM 80N... - RM 250N... series Vg = 80 ccm/rev ccm/ccm Repair Manual Doc.-No. HM3-013 UK

2 Seite 2 Table of contents 1. General Dismantling the distributor parts Dismantling the drive unit parts Removal of stuffing Setting the taper roller bearings Assembly the drive unit parts Assembly the distributor parts Measurement and adjustment table Starting-up Radial Piston Motor with 2nd shaft end (instrument shaft) Dismantling the instrument shaft- distributor peg Assembly the instrument shaft- distributor peg...7

3 1. General Radial Piston Motor Seite For dismantling / assembly the highest possible degree of cleanliness must be ensu red. Do not use fibrous cleaning rags or cotton waste. Do not carry out works of this nature in workshops, where metal cutting or grinding work is carried out where there is excessive dust. 1.2 lf the motor is opened or disconnected from its inlet / outlet pipes the escaping oil must be collected. 1.3 Appropriate jacking of the motor facilitates dismantling. 1.4 Ensure that dismantled parts, in particular all sliding surfaces and sealing elements, are not contaminated or damaged. 1.5 A table covered with clean oiled paper is recommended for depositing dismantled parts. 1.6 Lifting gear is required. - RM 80N Kgs. up to RM 250N Kgs. 1.7 The following spares lists are in explanation to this repair manual: for RM 80N No. RM 50.79, for RM 125N No. RM 50.21, for RM 160N No. RM and for RM 250N No. RM Dismantling the distributor parts 2.1 Jack the motor in a vertical position with the driveshaft pointing downwards. 2.2 Remove the allen-type screws (45). 2.3 Remove the cover plate (47). 2.4 Remove lockwasher (43.7) using two strong screwdrivers, whereby the bush (46) must be depressed by approx. 1 mm, so that the lockwasher is free of axial pressure and can be eased out with two srcewdrivers. 2.5 The bush (46) can be extracted by fitting two M8 srews in the tapped holes provided and pulling the bush by the screws. The seals could be damaged and must in each case be replaced prior to fitting. 2.6 The pressure pad (43.2) with spring (44) and seals (56.1 and 56.2) is in most cases located centrally in the bush and is removed at the same time. Note: All faces of the interior, the bush and the pressure pad are sealing surfaces and must not show any scoring (do not damage). 2.7 Extract distributor eccentric (43.1) together with roller cage and cylindrical rollers. 2.8 Control inner ring (41.1) and control outer ring (42) with seals (55.1/55.21, 57.1/57.2), spring disk (43.4) and ball valve (41.2/41.3) to be removed completely. 2.9 Damage to the distributor (40) occurs only rarely. As special tools and experience is required, please return this item to our works for repair. 3. Dismantling the drive unit parts 3.1 Jack up the motor with driveshaft upward (collect leaking oil).

4 Seite Loosen and remove the bearing cover screw (26). Clean the screw thread from fixing adhesive Loctite or Omnifit (screws are glued). Torque as per table on page Evenly press out the bearing cover (21) by screwing two screws (26) into the opposite threaded holes. 3.4 The Shaft Seal (51.3) with wiper (51.1) can now be replaced and, if required, the spacer ring (51.2). 3.5 Now the stuffings have to be disassembled as per Remove the adapter plates (23). 3.7 The crankshaft (10) can now be removed vertically. For this purpose, an eyebolt as per table on page 9 is fitted into the thread on the crankshaft, by which the crankshaft is carefully extracted. When extracting the crankshaft (10), the polygonring (32) and the taper roller bearings will be removed together with the crankshaft. 4 Removal of Stuffing 4.1 Slacken and remove the stuffings (22), using a SW 70 hexagon ringspanner. Remove O-ring (54). 4.2 Remove disc spring (33) and spiral spring (34). 4.3 Do not mix up the pistons (31) vis-a-vis the motor housing bores, mark with remova ble paint, if required. 4.4 Manually remove piston (31) from bore. Replace sealing ring (59) at bottom of piston only if required. Remark: The outside diameter of the sealing washer (59) is larger than the diameter of the piston drill hole. For a proper mounting of this seal use a tube with a cone inside. 5. Setting the taper roller bearings 5.1 Before setting the taper roller bearings, disassemble the piston according to ( ) and draw out the crankshaft The setting of the taper roller bearings is carried out by selecting suitable alignment disc (23). The alignment disc consists layers of aluminium foil, glued to each other by adhesive. The bearing play of the taper roller bearings can be reduced by removing individual discs so that a higher frictioal torque is obtained at the crank shaft. 5.3 Insert the rear taper roller bearing (25) into the motor housing (20). Carefully insert the crankshaft into the rear taper roller bearing of the motor housing. Fit the front roller bearing (24) onto the crankshaft (10). Insert the alignment disc (23) into the motor housing and insert the bearing cover (21) over the crankshaft into the motor housing. Secure with 4 screws (26). Fit a hexagon head screw into the thread in the crankshaft. Apply a torque wrench and slowly rotate the crankshaft using the torque wrench. Do not lubricate bearing tracks. lf the bearings are set correctly, the torque wrench must show a torque as per table on page 9. The bearing play can be reduced by removing some of the foils from the alignment disc (23).

5 5.4 After setting the bearings, again dismantle the crankshaft. Seite 5 6. Assembly the drive unit parts Assembly is carried out in reverse order. 6.1 Fit taper roller bearing (25) into the motor housing. 6.2 Fit the crankshaft according to 3.6 in reverse order. 6.3 Fit the bearing (24) with the crankshaft. 6.4 Clean the threads in the motor case with a fat solvent and wet the first turns with Loctite or Omnifit. 6.5 Assemble the bearing cover (21) with O-ring (52) and alignment disc (23) as prepared under Check the shaft sealing ring. lf required, fit new shaft sealing ring (51.3) and new wiper (51.3) to the bearing cover (21). Do not forget the distance ring (51.2) between the shaft sealing ring (51.3) and the wiper ring (51.1). Note: Uniformly press in the shaft sealing ring on the circumference of the outer ring of the shaft sealing ring (if required, use suitable tube); twisting will destroy the shaft sealing ring. The spaces between the shaft sealing ring (51.3) and the wiper ring (51.1) and also under the shaft sealing ring (51.3) are to be filled with acid-free grease. 6.7 Fit the bearing cover (21) with outer race of the taper roller bearing (25) and shaft sealing ring (51.3), distance ring (51.2) and wiper ring (51.1). Avoid damage to the sealing lip. lf required, use protective sleeve. 6.8 Fit the allen-type screws (26). Uniformly tighten the screws of the bearing cover. Torque as per table on page The assembly of pistons and stuffings ensues in reverse order - see Assembly the distributor parts Assembly of the control unit in reverse order to dismantling - see Jack motor with the shaft end pointing downwards. 7.2 Renew all seals of the control unit. 7.3 Fit completely assembled control ring (items 41.1, 41.2, 41.3, 42, 55.1, 55.2, 57.1, 57.2) and according to 7.5 push eccentrically towards the centre axis. 7.4 Assemble the roller cage (43.5) with the eccentric (43.1). Assemble the cylindrical roller (43.6) in the cage (43.5). Push this assembled unit over the crankshaft. 7.5 Care should be taken when assembling the distributor eccentric (43.1), that the upmost point of the distributor eccentric is pushed upwards by 90 to the crankshaft eccentric, (10) to the left of the upmost point of the crankshaft eccentric on the square section of the crankshaft. The upmost point of the crankshaft eccentric is marked by means a punch mark on the face of the square sectionof the control spigot of the crankshaft (when viewed in the direction of the distributor).

6 Seite 6 This method of assembly of the distri butor provides right-hand rotation, with the flow passing from port 2 to 1. (See catalogue sheet for further details). 7.6 Determination of the upmost point of the distributor eccentric. Upmost point of the crankshaft eccentric Upmost point of the distributor eccentric Upmost point of the control spigot 7.7 Determination of the upmost point of the crankshaft eccentric. 7.8 In the case of all motors with a splined shaft a punch mark on the face of the take-off shaft points in the direction of the upmost point of the eccentric on the crankshaft (10). Eccentric direction when viewed from the shaft end. Motos with splined shaft and involute splined shaft (acc. DIN 5480) Motors with cylindrical shaft with key acc. DIN 6885 Punch mark At the motor with cylindrical drive shaft, type Z, the feather key lies on the drive shaft and opposite to the eccentric peask point of the crankshaft (10). 8. Measurement and adjustment table Torque [Nm] RM 80N RM 125N RM 160N RM 250N Remarks Screws (26) Bearing cover Plugs (22) Plugs Screws (45) End cover Bearing setting 0,5-2,5 0,5-2,5 0,5-2,5 0,5-2,5 Threaded hole Crankshaft / hollow shaft M 16 (M 10) M 16 (M 10) M 16 (M 10) M 16 (M 10) Final strength after Recommended self-hardening plastics: Loctite 270 ~12 h Omnifit 80 M Rot ~24 h Eye bolt DIN 580 suitable for Transport 9. Starting-up 9.1 The motor leakage oil connection is to be positioned so that the casing always remains full of hydraulic fluid. 9.2 The motor must be filled with hydraulic fluid via a leakage fluid connection before starting-up.

7 Seite Leakage from the radial piston motor must be returned to the tank separately from runback and from other users, to avoid retained pressure. 9.4 The leakage pressure measured directly at the leakage fluid connection should not exceed 1 bar. 9.5 The entire hydraulic system should be completely vented to ensure faultless operation of the motor. 9.6 When starting-up the motor, do not operate immediately at maximum pressure and / or maximum speed, but allow newly fitted parts time to settle or run in. Recommendation for the first hours of operation: Pressure approx bar Speed approx rpm Optimum running properties only occur after a running-in phase of approx hours. 10. Radial Piston Motor with 2nd shaft end (instrument shaft) 10.1 The motor with instrument shaft is identified in the type designation by the prefix M Parts (43.3, 44, 45, 47, 49.1, 49.2, 49.3 and 63) are identical for all motors with instrument shaft from RM 80N... M, RM 125N... M, RM 160N... M, and RM 250N... M. 11. Dismantling the instrument shaft- distributor peg 11.1 The motor is placed on a stand with the take-off shaft pointing downwards The hexagon socket screws are removed from the end-cover (47) The end-cover (47) together with the shaft sealing ring (63) and the bearing (49.2) are withdrawn from the motor housing with the aid of an M6 tap Remove spring (44) and spring retainer (43.3) from the instrument shaft (49.1) Now dismantle the remaining components of the distributor assembly, given under 2.4 to Assembly of the intrument shaft- distributor peg 12.1 Procedure is the reverse sequence of that for dismantling, whereby all seals, and possibly the bearing (49.2) have to be replaced The instrument shaft (49.1) is shrink-fitted into the crankshaft (10) and additionally secu red by means of a pin (49.3) In the event of replacement, a crankshaft (10) together with instrument shaft (49.1), should be ordered as a complete unit, or the detailed assembly instructions for the crankshaft-instrument shaft should be ordered.

8 DUESTERLOH has been developing fluid technology products for more than 100 years. The drives, controls and hydraulic power units from Hattingen are appreciated throughout the world for their complete reliability; including under extreme conditions. The owner-managed company s own development and construction department and the wide range of products cater for distinctive flexibility and customer-orientation. Products Hydraulic radial piston motors Hydraulic axial piston motors Hydraulic high precision motors Pneumatic motors Pneumatic starters Hydraulic and pneumatic controls Hydraulic power units Designing controls and hydraulic power units specific to the customer is our company s major strength. Vast product diversity is also available for standardized products. Industrial areas of application Machine tools Smelting and rolling mill equipment Foundry machines Testing machines Shipbuilding (diesel engines) Offshore technology Printing and paper technology Vehicle construction Manipulators Environmental technology Mining equipment Materials handling equipment Düsterloh Fluidtechnik GmbH Im Vogelsang 105 D Hattingen Tel.: Fax: info@duesterloh.de Internet: Certified acc. to ISO 9001