Gehl RS5-19 Rexroth Drive Pump A 4 VG 40-56 Series 3.2 Repair REPAIR INSTRUCTIONS Manual 913309 PDF

Gehl RS5-19 Rexroth Drive Pump A 4 VG 40-56 Series 3.2 Repair REPAIR INSTRUCTIONS Manual 913309 – PDF DOWNLOAD

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Gehl RS5-19 Rexroth Drive Pump A 4 VG 40-56 Series 3.2 Repair REPAIR INSTRUCTIONS Manual 913309 – PDF DOWNLOAD

FUNCTION

To cut off flow while maintaining pressure. This corresponds to a return of the pump displacement to the “O” before the HP valve calibration is reached. This valve anticipates HP relief valve activation on acceleration and deceleration (rapid rise in pressure). The peak pressure is reduced by the HP relief valves which also protect the circuit against ultra-rapid fluctuations. The calibration range for cutting off the flow while maintaining pressure covers the whole working pressure range. The corresponding calibration values should however be 20 to 30 bar lower than those of the HP relief valves.

Composition of the DR Valve

1.  HP circuit sensor flow selector.
2.  A slide valve which connects the pilot circuit to the tank in order to release the pump from the pilot control while maintaining the 400 bar leve l (control s tarts at 6 to 7 bar, control ends at 20 bar with maximum flow).
   The DR valve allows the flow to be reduced while re taining maximum torque.

2) OPERATION

The HP MA or MB pushes the HP circuit selector upwards or downwards thus closing the opposite low
pressure port (in a HP direction of A to B, the HP traverses the centre of the selector through a small channel).
In all cases, the HP then pushes the needle 4 which in turn raises the control slide valve 3 which creates a
partial connection between the control opening and the return thus reducing the pilot pressure
The effect of this is to reduce the pump displacement, thus reducing the flow while maintaining the 400 bar HP
(flow reduction for a maximum torque).
This action of removing the pilot control from the pump acts in the same way as the restoring forces gen erated
by the HP and the adjustment of the control plate.

TABLE OF CONTENTS:

Gehl RS5-19 Rexroth Drive Pump A 4 VG 40-56 Series 3.2 Repair REPAIR INSTRUCTIONS Manual 913309 – PDF DOWNLOAD

General Repair Instructions ………………………………………………………………………………………………………………… 1
– Seal kits and sub assembly groups ……………………………………………………………………………………………………… 2
– Sub assemblies groups ……………………………………………………………………………………………………………………….. 3
– Sealing of the drive shaft …………………………………………………………………………………………………………………….. 4
– Sealing of the boost pump ………………………………………………………………………………………………………………….. 5
– Sealing of the control piston cover ……………………………………………………………………………………………………… 6
– Sealing of the valves …………………………………………………………………………………………………………………………… 8
– Sealing of the pressure cut-off valve …………………………………………………………………………………………………… 9
– Sealing of the control valve …………………………………………………………………………………………………………………. 10
– Removing of the control module ………………………………………………………………………………………………………… 11
– Pump disassembly ……………………………………………………………………………………………………………………………… 13
– Removal of the rotary group ……………………………………………………………………………………………………………….. 15
– Disassembly of the positioning piston ………………………………………………………………………………………………… 16
– Inspection notes ………………………………………………………………………………………………………………………………….. 17
– Inspection of rotary group parts …………………………………………………………………………………………………………. 18
– Installation of rotary group ………………………………………………………………………………………………………………… 20
– Assembly of the Pump ……………………………………………………………………………………………………………………….. 24
– Tightening torques ……………………………………………………………………………………………………………………………… 26
– Safety regulations …………………………………………………………………………………………………………………….. 27
– Adjusting Transmission ………………………………………………………………………………………………………….. 29