REXROTH A4VG - Setting Hydraulic Neutral Position of Controller

16/40 Bosch Rexroth AG A4VG Series 40 | RE 92004-01-S031/08.2015
Controller
4.4 Setting controller (hydraulic neutral position)
This section describes how you set the hydraulic neutral position.
There is a wide variety of controllers.
Please note that the configuration of only one such controller is shown here
exemplarily.
Risk of injury!
The following works on the variable pump are dangerous.
f Pay close attention to the safety instructions (See Chapter "2 General safety
instructions").
f While working with hazardous materials (for example, hydraulic fluids), always
wear safety gloves and safety glasses.
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Fig. 6: Hydraulic neutral position
1 Clamping screw 2 Eccentric pin
To set the hydraulic neutral position:
1. Connect pressure gauges (max. 40 bar) to ports X
1
and X
2
.
The oil temperature in the closed circuit should be approx. 65 °C.
2. Secure the vehicle against unintended motion and then switch the control
device to the neutral position.
Test speeds for the engine: Idle and maximum rpm.
3. At both speeds check that both pressure gauges on the ports X
1
and X
2
give
the same reading.
4. If the pressure values do not agree, loosen the clamping screw (1).
5. Turn the eccentric pin (2) until the same pressure reading is indicated on both
gauges.
Do not turn the eccentric pin on the control unit beyond 90°.
6. Tighten the clamping screw (1).
WARNING!
Procedure