Axial Piston Variable Pump A4VTG

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1 Electric Drives and Controls Hydraulics Linear Motion and Assembly Technologies Pneumatics ervice Axial Piston Variable Pump A4VTG RE 92013/ /20 Replaces: RE Data heet eries 33 izes NG71, 90 Nominal pressure 400 bar Peak pressure 450 bar Closed circuit for the drum drive in mobile concrete mixers Contents Ordering code / standard program 2 Technical data 4 High-pressure relief valves 7 HW1 - proportional control, hydraulic, mechanical servo 8 EP - proportional control, electric 9 Dimensions, size Dimensions, size Through drive dimensions 14 Mechanical stroke limiter 15 Ports X 3 and X 4 for stroking chamber pressure 15 Filtration type 16 Connector for solenoids 17 Installation situation for coupling assembly 18 Installation instructions 19 General instructions 20 Features Variable axial piston pump of swashplate design for hydrostatic closed circuit transmission Flow is proportional to drive speed and displacement and is infinitely variable Flow increases with the swivel angle of the swashplate from 0 to its maximum value Flow direction changes smoothly when the swashplate is moved through the neutral position Two pressure-relief valves are provided on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overload The high-pressure relief valves also function as boost valves The integrated boost pump acts to replenish leakage and provide control oil. The maximum boost pressure is limited by a built-in boostpressure-relief valve

2 2/20 Bosch Rexroth AG A4VTG RE 92013/04.08 Ordering code / standard program A4VT G / 33 M N C4 F A Axial piston unit 01 Variable swashplate design, nominal pressure 400 bar, peak pressure 450 bar, mobile concrete mixers A4VT Operation mode 02 Pump, closed circuit G ize 03 Displacement V g max in cm Control device Proportional control, mechanical servo, hydraulic hex shaft with lever to rear Proportional control, electric with emergency actuation and spring return U = 12 V DC U = 24 V DC HW1 1) EP3 EP Connector for solenoids Without connector 0 DEUTCH connector, molded, 2-pin without suppressor diode Auxiliary functions Without auxiliary functions 0 With mechanical stroke limiter, external variable With ports X 3, X 4 for stroking chamber pressure With mechanical stroke limiter and ports X 3, X 4 eries 07 eries 3, Index 3 33 Design for port and fixing threads 08 Metric M Direction of rotation Viewed from shaft end clockwise R 09 counterclockwise L eals 10 NBR (nitrile-caoutchouc), shaft seal in FKM (fluor-caoutchouc) N Mounting flange 11 AE J C4 haft end plined shaft without coupling flange V8 ANI B92.1a /8in 21T 16/32DP with coupling flange C8 12 without coupling flange V9 1 1/2in 23T 16/32DP with coupling flange C9 13 ervice line ports AE flange ports A and B on same side left suction port at bottom m m 1 right suction port at top 2 P M T B 1) Mounting position of the lever not specified on delivery, to be aligned by the customer

3 RE 92013/04.08 A4VTG Bosch Rexroth AG 3/20 Ordering code / standard program A4VT G / 33 M N C4 F A Boost pump 14 With integrated boost pump F 15 Through drive Flange AE J744 Mounting variant plined shaft coupler 1) ymbol Code Diameter Code Without through drive A2 5/8in 9T 16/32DP 2 A B2 7/8in 13T 16/32DP 4 B24 High-pressure valves 16 With high-pressure relief valve, direct operated A Filtration, boost circuit 17 Filtration in suction line of boost pump 18 tandard / special version tandard version pecial version combined with attachment part or attachment pump -K combined with attachment part or attachment pump -T 1) plined shaft coupler acc. to ANI B92.1a-1976 (splined shafts assigned acc. to AE J744 see page 14) = available m = on request = not available -0 -

4 4/20 Bosch Rexroth AG A4VTG RE 92013/04.08 Technical data Hydraulic fluid Before starting project planning, please refer to our data sheets RE (mineral oil), RE (environmentally acceptable hydraulic fluids) and RE (HF hydraulic fluids) for detailed information regarding the choice of hydraulic fluid and operating conditions. The variable pump A4VTG is not suitable for operating with HFA, HFB and HFC. If HFD or environmentally acceptable hydraulic fluids are being used, the limitations regarding technical data and seals mentioned in RE and RE must be observed. When ordering, please indicate the used hydraulic fluid. election diagram Viscosity ν in mm 2 /s VG 22 VG 32 VG 68 VG 46 VG opt Details regarding the choice of hydraulic fluid The correct choice of hydraulic fluid requires knowledge of the operating temperature in relation to the ambient temperature: in a closed circuit the circuit temperature. The hydraulic fluid should be chosen so that the operating viscosity in the operating temperature range is within the optimum range (ν opt. ) - see the shaded area of the selection diagram. We recommended that the higher viscosity class be selected in each case. Example: At an ambient temperature of X C, an operating temperature of 60 C is set. In the optimum operating viscosity range (ν opt., shaded area) this corresponds to the viscosity classes VG 46 or VG 68; to be selected: VG 68. Please note: The case drain temperature, which is affected by pressure and speed is always higher than the circuit temperature. At no point of the component may the temperature be higher than 115 C. The temperature difference specified below is to be taken into account when determining the viscosity in the bearing. If the above conditions cannot be maintained due to extreme operating parameters, please contact us Temperature t in C t min = -40 C Hydraulic fluid temperature range t max = +115 C Viscosity and temperature Viscosity in mm 2 /s Temperature Comment torage T min -50 C T opt = +5 C to +20 C up to 12 months for standard factory conservation up to 24 months with long-term factory conservation (Cold) start-up 1) n max = 1600 T t -40 C t 3 min, without load (p max 50 bar), n nom 1000 rpm Temperature DT 25 K between axial piston unit and hydraulic fluid difference Warm-up phase n = 1600 to 400 T = -40 C to -25 C at p max, 0.5 n nom and t 15 min Operating phase Duration n = 400 to 10 T = -25 C to +90 C p max, n nom n opt = hort-term n min = 5 T max = +115 C t < 3 min, p < 0.3 p max Temperature DT = approx. 5K between case drain fluid and bearing, dependent on difference pressure and speed FKM shaft seal 1) T +115 C see page 5 1) At temperatures below -25 C, an NBR shaft seal is necessary as special version (permissible temperature range: -40 C to +90 C)

5 RE 92013/04.08 A4VTG Bosch Rexroth AG /20 Technical data Filtration The finer the filtration, the higher the cleanliness level of the hydraulic fluid and the longer the service life of the axial piston unit. To ensure functional reliability of the axial piston unit, the hydraulic fluid must have a cleanliness level of at least 20/18/15 according to IO Depending on the system and the application, for the A4VTG we recommend Filter elements β With a rising differential pressure at the filter elements, the β value must not deteriorate. At very high hydraulic fluid temperatures (90 C to max. 115 C), at least cleanliness level 19/17/14 according to IO 4406 is required. If the above classes cannot be observed, please contact us. For notes on the filtration type, see page 16. Operating pressure range Input Variable pump: For controls EP and HW Minimum boost pressure (at n = 1500 rpm) p p min 22 bar Boost pump: uction pressure p p min (ν 30 mm 2 /s) 0.8 bar absolute At cold start, for short-term (t < 3 min) 0.5 bar absolute uction pressure p p max 5 bar absolute Output Variable pump: Pressure at port A or B Nominal pressure p N 400 bar Peak pressure p max 450 bar Max. pressure stroke for p N and p max 310 bar haft seal Permissible pressure load The service life of the shaft seal is affected by the speed of the pump and the case drain pressure. It is recommended that the average, continuous case drain pressure of 3 bar absolute at operating temperature not be exceeded (max. permissible case drain pressure 6 bar absolute at reduced speed, see diagram). hort-term (t < 0.1 s) pressures spikes of up to 10 bar absolute are permitted. The service life of the shaft seal decreases with an increase in the frequency of pressures spikes. The case pressure must be equal to or greater than the external pressure on the shaft seal. izes 71,90 6 Perm. pressure pabs. max. bar Temperature range ize 90 ize peed n in rpm The FKM shaft seal is permissible for case drain temperatures from -25 C to +115 C. Note: For application cases below -25 C, an NBR shaft seal is necessary (permissible temperature range: -40 C to +90 C). Please state NBR shaft seal in plain text when ordering. Please contact us. Boost pump: tandard setting p p (at n = 1500 rpm) 22 bar Nominal pressure p p nom. 30 bar Peak pressure p p max 40 bar (pressure data according to DIN 24312) Nominal pressure: Max. design pressure at which fatigue strength is ensured. Peak pressure: Max. operating pressure which is permissible for short-term (t < 1s). Max. pressure stroke: Largest difference between two successive pressure values within the pressure curve.

6 /20 Bosch Rexroth AG A4VTG RE 92013/04.08 Technical data Table of values (theoretical values, without efficiencies and tolerances; values rounded) ize NG Displacement variable pump V g max cm boost pump (at p = 20 bar) V g p cm peed maximum at V g max n max continuous rpm minimum n min rpm Flow at n max continuous and V g max q v max l/min Power 1 ) at n max continuous and V g max p = 400 bar P max kw Torque 1 ) at V g max p = 400 bar T max Nm p = 100 bar T Nm Rotary stiffness shaft end V8 c Nm/rad shaft end V9 c Nm/rad Moment of inertia for rotary group J GR kgm Angular acceleration max. 2 ) a rad/s Filling capacity V L Weight approx. (without through drive) m kg ) Without boost pump 2) The area of validity is situated between the minimum required and maximum permissible speed. It applies for external stimuli (e.g. engine 2-8 times rotary frequency, cardan shaft twice the rotary frequency). The limit value applies for a single pump only. The loading on the connection parts has to be considered. Caution: If the maximum limit is exceeded resp. if the values are below the minimum limit may result in a loss of function, a reduced service life or in the destruction of the axial piston unit. A calculation can be performed to determine the permissible values. Determining the size Flow qv = Torque T = Power P = V g n η v 1000 V g Δp 20 π η mh L/min Nm 2 π T n = qv Δp kw η t V g = Displacement volume per revolution in cm 3 Δp = Differential pressure in bar n = peed in rpm η v = Volumetric efficiency η mh = Mechanical-hydraulic efficiency η t = Total efficiency Permissible input and through-drive torques ize NG Torque at V g max and Dp = 400 bar) 1) T max Nm Input torque, max 2) at shaft end V8 1 3/8in 21T 16/32DP T E perm. Nm 970 V9 1 1/2in 23T 16/32DP T E perm. Nm 1305 Through-drive torque, max. T D perm. Nm ) Efficiency not considered 2) For drive shafts with no radial force

7 RE 92013/04.08 A4VTG Bosch Rexroth AG 7/20 Technical data Permissible axial and radial loading on drive shaft ize NG Radial force, max. at distance (from shaft collar) F q a,b,c F q max N a mm F q max N b mm F q max N c mm Axial force, max. + F ax + F ax max N F ax max N Note: special requirements apply in the case of belt drives. Please contact us. When considering the permissible axial force, the force-transfer direction must be taken into account. + F ax max = Increase in service life of bearings F ax max = Reduction in service life of bearings (avoid) High-pressure relief valves The two high-pressure relief valves protect the hydrostatic transmission (pump and motor) from overload. They limit the maximum pressure in the respective high-pressure line and serve at the same time as boost valves. tandard setting: X1 R X2 High-pressure valves Δp HD 400 bar For other pressure settings, please contact us. T1 P MB B etting diagram 10 bar p max Operating pressure pa, B at port A, B Δp Drive design pp afety Boost pressure p p Differential pressure ΔpHD HD valve setting T2 High-pressure relief valve MA A Boost-pressure relief valve q v1 (n = 1000 rpm) q v max (n = nmax) Please note: The valve settings are made at n= 1000 rpm and at V g max (q v 1 ). There may be deviations in the opening pressures with other operating parameters.

8 8/20 Bosch Rexroth AG A4VTG RE 92013/04.08 HW1 - proportional control, hydraulic, mechanical servo The flow output of the pump is infinitely varied in the range of 0 to 100%, proportional to the rotation of the control lever between 0 and ±29 from the spring-centered zero flow position. A feedback lever, connected to the stroke piston, maintains the pump flow for any given position of the control lever between 0 and 29. V g 1,0 V g max β in ,8 0,6 0,4 0 0,2 50 0,2 0,4 0,6 0,8 1, β in wivel angle β at the control lever for deflection: tart of control at β = 3 End of control at β = 29 (max. displacement V g max ) Mech. stop for β: ±40 V g V g max The maximum required torque at the lever is 170 Ncm. To prevent damage to the HW control unit, a positive mechanical stop must be provided for the HW control lever. Note: pring centering enables the pump to move automatically into the neutral position (V g = 0) as soon as there is no longer any torque on the control lever of the HW control unit (regardless of deflection angle). Assignment Direction of rotation - Control - Direction of through put flow Direction of rotation cw ccw T1 ccw X1 Lever direction cw R Control pressure Direction of through put flow Operating pressure a X 2 B to A M A b X 1 A to B M B a X 2 A to B M B b X 1 B to A M A b X1 X2 a MB X2 MA A B a b P MB B T2 MA A

9 RE 92013/04.08 A4VTG Bosch Rexroth AG 9/20 EP - proportional control, electric The flow output of the pump is infinitely varied in the range of 0 to 100%, proportional to an electrical current which is supplied to solenoid a or b. The electrical energy is converted to a force acting on the stroke piston. The stroke piston then directs control oil in and out of the stroking chamber to stroke the pump as required. A feedback lever, connected to the stroke piston, maintains the pump flow for any given current within the control range. EP3/4: with supply filtration (standard) EP4 EP3 I in ma V 1,0 0,8 0,6 g V g max EP EP ,4 0,2 0 0,2 0,4 0,6 0,8 1,0 V g I in ma Technical data olenoid EP3 EP4 Voltage 12 V (±20 %) 24 V (±20 %) V g max Control current tart of control at V g ma 200 ma End of control at V g max 1200 ma 600 ma Limiting current 1.54 A 0.77 A Nominal resistance (at 20 C) 5.5 Ω 22.7 Ω Dither frequency 100 Hz 100 Hz Actuated time 100 % 100 % The following electronic controllers and amplifiers are available for actuating the proportional solenoids (further information on the Internet at BODA controller RC eries 20 RE eries 21 RE eries 22 RE eries 30 RE and application software Analog amplifier RA RE Caution The spring return in the control unit is not a security device. The slide valve of the control unit can be blocked in an undefined position by internal contamination (impure hydraulic fluid, abrasion or residual contamination from system components). As a result, the axial piston unit can no longer supply the flow specified by the operator. Properly install an emergency-off function to ensure that the driven consumer can be brought to a safe position (e.g. immediate stop). Maintain the specified cleanliness level 20/18/15 (<90 C) or 19/17/14 in accordance with IO ccw cw X 1 X 2 M B M A A B Proportional solenoid a Proportional solenoid b tandard: Proportional solenoid with emergency actuation and spring return T1 X1 R a b X2 P MB B Assignment Direction of rotation - Control - Direction of through put flow Actuation of solenoid Control pressure Through put flow Operating pressure Direction of rotation cw ccw b X 2 B to A M A a X 1 A to B M B b X 2 A to B M B a X 1 B to A M A T2 MA A

10 10/20 Bosch Rexroth AG A4VTG RE 92013/04.08 Dimensions, size 71 Proportional control, hydraulic, mechanical servo, HW1 tandard: suction port at top (02) Option: suction port at bottom (01): port plate turned through 180 Before finalizing your design, please request a binding installation drawing. Dimensions in mm P ø ) X 1 R X 1 1) Center of gravity ø T 1 A X 17 1) T ) T 2 B M B T 2 R X 1 a Detail X Port A/B ø b X 2 P M A Proportional control, electric, EP Note: Mounting position of the lever not specified on delivery, to be aligned by the customer.

11 RE 92013/04.08 A4VTG Bosch Rexroth AG 11/20 Dimensions, size 71 haft ends Before finalizing your design, please request a binding installation drawing. Dimensions in mm. C8 plined shaft 1 3/8in with coupling flange V8 plined shaft 1 3/8in 21T 16/32DP 1) (AE J744) M8x1.25 2) ø A A ø81 7/16-14UNC-2B R1.6 ø45 ø ø Ports Designation Port for tandard ize 2) Peak pressure (bar) 3) A, B ervice line AE J518 4) 1 in 450 O Fixing thread A/B DIN 13 M12x1.75; 17 deep uction DIN 3852 M42x2; 20 deep 5 O T 1 O Tank DIN 3852 M26x1.5; 16 deep 3 5) T 2 X 5) M A Measuring pressure A DIN 3852 M12x1.5; 12 deep 450 X M B Measuring pressure B R Air bleed DIN 3852 M16x1.5; 12 deep 3 X X 1, X 2 Control pressure (upstream of orifice) DIN 3852 M12x1.5; 12 deep 40 X X 3, X 4 troking chamber pressure DIN 3852 M12x1.5; 12 deep 40 X P Pilot pressure inlet DIN 3852 M14x1.5; 12 deep 40 X 1) ANI B92.1a-1976, 30 pressure angle, flat root, side fit, tolerance class 5 2) Please observe the general instructions for the max. tightening torques on page 20 3) hort-term pressure spikes may occur depending on the application. Please keep this in mind when selecting testers and armatures. 4) Only dimensions according to AE J518 5) Dependent on installation position, T 1 or T 2 must be connected (see also page 19) O = Must be connected (plugged on delivery) X = Plugged (in normal operation) tate

12 12/20 Bosch Rexroth AG A4VTG RE 92013/04.08 Dimensions, size 90 Proportional control, hydraulic, mechanical servo, HW1 tandard: suction port at top (02) Option: suction port at bottom (01): port plate turned through 180 Before finalizing your design, please request a binding installation drawing. Dimensions in mm. ø P T ø8 8 X R X ) X P MA b a A 17 1) B MB Advance information T1 6 1) X1 R X Detail X Port A/B ø Proportional control, electric, EP 14.4 T2 1) Center of gravity Note: Mounting position of the lever not specified on delivery, to be aligned by the customer.

13 RE 92013/04.08 A4VTG Bosch Rexroth AG 13/20 Dimensions, size 90 haft ends Before finalizing your design, please request a binding installation drawing. Dimensions in mm. C9 plined shaft 1 1/2in with coupling flange V9 plined shaft 1 1/2in 23T 16/32DP 1) (AE J744) M8x1.25 2) ø A A ø81 7/16-14UNC-2B R2.5 ø50 ø ø Ports Designation Function tandard ize 2) Peak pressure (bar) 3) A, B ervice line AE J518 4) 1 in 450 O Fixing thread A/B DIN 13 M12x1.75; 17 deep uction DIN 3852 M42x2; 20 deep 5 O T 1 T 2 Tank DIN 3852 M26x1.5; 16 deep 3 M A, M B Measuring pressure A Measuring pressure B DIN 3852 M12x1.5; 12 deep 450 X R Air bleed DIN 3852 M16x1.5; 12 deep 3 X X 1, X 2 Control pressure (upstream of orifice) DIN 3852 M12x deep 40 X X 3, X 4 troking chamber pressure DIN 3852 M12x deep 40 X P Pilot pressure inlet DIN 3852 M14x1.5; 12 deep 40 X 1) ANI B92.1a-1976, 30 pressure angle, flat root, side fit, tolerance class 5 2) Please observe the general instructions for the max. tightening torques on page 20 3) hort-term pressure spikes may occur depending on the application. Please keep this in mind when selecting testers and armatures. 4) Only dimensions according to AE J518 5) Dependent on installation position, T 1 or T 2 must be connected (see also page 19) O = Must be connected (plugged on delivery) X = Plugged (in normal operation) tate O 5) X 5)

14 14/20 Bosch Rexroth AG A4VTG RE 92013/04.08 Through drive dimensions Before finalizing your design, please request a binding installation drawing. Dimensions in mm. Flange AE J744 Mounting variant plined shaft coupler 1) ymbol Code Diameter Code 82-2 A2 5/8in 9T 16/32DP 2 A22 M10x1.5; 15 deep 2) A3 NG A1 A2 A3 A O-ring 3 ) ø82.55 ø ,4 A1 A2 A B2 7/8in 13T 16/32DP 4 B24 M12x1.75; 21 deep 2) A3 O-ring 3 ) NG A1 A2 A ø A1 A2 1) ANI B92.1a-1976, 30 pressure angle, flat root, side fit, tolerance class 5 2) Thread acc. to DIN 13, please observe the general instructions for the max. tightening torques on page 20 3) O-ring included in the delivery contents

15 RE 92013/04.08 A4VTG Bosch Rexroth AG 15/20 Mechanical stroke limiter The mechanical stroke limiter is an additional function allowing the maximum displacement of the pump continuous reduction of, regardless of the control unit used. The stroke of the stroke cylinder and hence the maximum swivel angle of the pump are limited by means of two adjusting screws. EP circuit diagram T1 X1 R a b X max max Mechanical stroke limiter Ports X 3 and X 4 for stroking chamber pressure EP circuit diagram R 86.3 a b T1 X1 X3 X X X4 X 4

16 16/20 Bosch Rexroth AG A4VTG RE 92013/04.08 Filtration type Filtration in the suction line of the boost pump, Filter type: filter without bypass R b a Recommendation: with contamination indicator Flow resistance at the filter element: X1 X2 at ν = 30 mm 2 /s, n = n max Δp 0.1 bar at ν = 1000 mm 2 /s, n = n max Δp 0.3 bar T1 P MB B Pressure at port of the boost pump: uction pressure p p min (ν 30 mm 2 /s) 0.8 bar absolute At cold start, for short-term (t < 3 min) 0.5 bar absolute uction pressure p p max 5 bar absolute The filter is not included in the delivery contents. T2 MA A

17 RE 92013/04.08 A4VTG Bosch Rexroth AG 17/20 Connector for solenoids DEUTCH DT04-2P-EP04, 2-pin Molded, without bidirectional suppressor diode P Type of protection according to DIN/EN 60529: IP67 and IP69K Circuit symbol Without bidirectional suppressor diode olenoid with emergency actuation and spring return (2) (1) ø Mating connector DEUTCH DT06-2-EP04 Rexroth Mat. No. R Consisting of: DT designation 1 case DT06-2-EP04 1 wedge W2 2 sockets The mating connector is not included in the delivery contents. This can be supplied by Rexroth on request. Note: Emergency actuation (manual override) only to be used in event of function failure of the solenoid. Not approved for continuous operation! The position of the connector can be changed by turning the solenoid body. The following procedure is to be observed: 1. Loosen the fixing nut (1) 2. Turn the solenoid body (2) to the desired position 3. Tighten the fixing nut Tightening torque of the fixing nut: 5 +1 Nm (WAF26, 12-sided DIN 3124)

18 18/20 Bosch Rexroth AG A4VTG RE 92013/04.08 Installation situation for coupling assembly To ensure that rotating components (coupling hub) and fixed components (case, retaining ring) do not come into contact with each other, the installation conditions described here must be observed. This depends on the size and the splined shaft. AE splined shaft with mounted coupling flange (shaft C8, C9) The depicted installation conditions are already taken into account by Rexroth. AE splined shaft (shaft V8, V9) The outer diameter of the coupling hub must be smaller than the inner diameter of the retaining ring d 2 in the zone of the drive shaft collar (dimension x 2 x 3 ). AE splined shaft (spline according to ANI B92.1a-1976) Coupling hub x2 x1 d4 d3 d2 d1 x3 NG ød 1 ød 2 min ød 3 ød 4 x 1 x 2 x ± ±

19 RE 92013/04.08 A4VTG Bosch Rexroth AG 19/20 Installation instructions General During commissioning and operation, the axial piston unit must be filled with hydraulic fluid and air bled. This is also to be observed following a relatively long standstill as the system may empty via the hydraulic lines. The case drain in the case interior must be directed to the tank via the highest tank port (T 1, T 2 ). The minimum suction pressure at port must not fall below 0.8 bar absolute (cold start 0.5 bar absolute). In all operating conditions, the suction line and case drain line must flow into the tank below the minimum fluid level. Installation position ee examples below. Additional installation positions are available upon request. Below-tank installation (standard) Pump below the minimum fluid level of the tank. Recommended installation positions: 1 and 2. Above-tank installation Pump above the min. fluid level of the tank Observe the maximum permissible suction height h s max = 800 mm L 1 B B L 1 L 1 L 1 a min h t min h min h t min h min a min R L 2 L 2 T 2 R T 1 T 1 T 1 T 2 T 2 h s max B B h s max R T 2 T 1 R h t min h min a min a min h t min h min h s max = 800 mm, h t min = 200 mm, h min = 100 mm, a min = 200 mm, B = baffle (baffle plate) Installation position Air bleeding Filling Installation position Air bleeding Filling 1 R + T 1 (L 1 ) 3 R T 1 + (L 1 ) 2 L 1 + T 2 (L 1 ) 4 L 1 (L 2 ) + T 2 (L 1 )

20 20/20 Bosch Rexroth AG A4VTG RE 92013/04.08 General instructions The A4VTG pump is designed to be used in closed circuits. Project planning, assembly and commissioning of the axial piston unit require the involvement of qualified personnel. The service line ports and function ports are only designed to mounting hydraulic lines. During and shortly after operation, there is a risk of burns on the axial piston unit and especially on the solenoids. Take suitable safety measures (e.g. wear protective clothing). There may be shifts in the characteristic depending on the operating state of the axial piston unit (operating pressure, fluid temperature). The data and note contained herein must be adhered to. The following tightening torques apply: - Threaded hole in axial piston unit: The maximum permissible tightening torques M Gmax are the maximum values for the threaded holes that must not be exceeded. For values, refer to the following table. - Armatures: Observe the manufacturer's instruction regarding tightening torques for the used armatures. - Fixing screws: For fixing screws according to DIN 13, we recommend checking the tightening torque in individual cases as per VDI Locking screws: For the metallic locking screws supplied with the axial piston unit, the required tightening torques of locking screws M V apply. For values, refer to the following table. Thread size at ports Max. permissible tightening torque of the threaded holes M Gmax Required tightening torque of the locking screws M V M12x1.5 DIN Nm 25 Nm 6 mm M14x1.5 DIN Nm 35 Nm 6 mm M16x1.5 DIN Nm 50 Nm 8 mm M26x1.5 DIN Nm 120 Nm 12 mm M42x2 DIN Nm 360 Nm 22 mm WAF hexagon socket Bosch Rexroth AG Hydraulics Axial Piston Units Glockeraustraße Elchingen, Germany Phone +49 (0) Fax +49 (0) info.brm-ak@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging. ubject to change.

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