RE 15345-WA, Version 11.2022, Bosch Rexroth AB
Commissioning |
Drive system Hägglunds Fusion 47/72
2. High pressure relief valves (HD valves) setting A and B side
For setting levels see the order specific Hägglunds Fusion documentation.
The high pressure relief valve setting should be 40 bar [580 psi] > compensator
pressure setting. Carry out checking and adjustment at operating temperature.
To be able to do checking and / or adjustment, main-port has to be blocked.
Meassure the working pressure in both the MA and MB port
To block the pressure cut-off (item 1 in
) when testing the high pressure
valves, the adjustment screw, with the lock-nut loosened, has to be screwed in
with a max. torque of 2 Nm in the depressurized conditon
until the end stop is
reached.
Forces larger than 2 Nm bend the spring and spring plate. The pressure cut-off
setting can then no longer be guaranteed.
Swivel the pump to a low pump flow in A-side.
Check setting value.
Size 28 - 56
Note!
If the checked values differ from the original settings, please contact your
Bosch Rexroth representative in terms of adjusting the settings.
Size 71 -125
Adjust the high pressure relief valve on A-side if needed, see
Check setting value (only for a short time due to fast temperature increase)
Change setting values in the depressurized conditon
.
Then check setting values.
Valid for all pump sizes
After that do the corresponding procedure on B-side.
Pressure cut-off:
Turn back setting screw to mesurement.
Check pressure value and readjust if necessary.
Fig. 25: Setting high pressure relief valve
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