Pump Settings And Adjustments - Bosch Rexroth Hagglunds DUc MS2 Installation & Maintenance Manual

STEP 5
Check:
• Unusual noises or vibrations.
• Function of the safety equipment.
• Temp in tank and closed loop. Check also that the cooler control is stable. If not,
investigate water supply, controls, air-oil cooler, etc.
• Leakage points.
• Pump compensator pressure control and pressure switches (optional). At
delivery, these pressure levels are set according to the order specific hydraulic
diagram and normally no readjustment will be necessary. Pump compensator
pressure can be checked by closing the valve on the high pressure leg and stroke
the pump until the pressure is indicated on the control system display or on an
optional gauge.
STEP 6
After test
• Correct any faults discovered at the points above.
• Check the filter indicator. It might be necessary to change filter elements due
to particles from the piping. When changing filter elements carefully follow the
instructions in 9.3: Filter change to avoid dirt into the system. If there still is dirt
in the system, additional flushing is necessary in order to prevent premature
failure of system components.
• Check all connections, screws etc. and tighten if necessary.

8.5 Pump settings and adjustments

8.5.1 Variable displacement SP pump
Charge pressure level, control pressure level, high pressure relief valves and
pressure compensator are set from factory and there is normally no need for
readjustment. Check always the pressure levels in the attached order specific
Hägglunds DUc documentation.
Setting of pressures on the pump(s) must be performed by skilled service
personnel familiar with the functions and risks involved with the pump. The
pressures shall be set during operation of electric motor and with the system at
operating temperature. Note that pressures can change with different viscosities.
1. Charge pressure adjustment
To adjust the charge pressure the pump shall be in neutral position (zero
displacement). Release the lock nut, and adjust the charge pressure to the necessary
level by turning the setting screw. The charge pressure shall normally be set to 15
bar (220 psi). On application with high shock loads, example shredders, the
charge pressure shall preferably be set to 20 bar (290 psi).The charge pressure
shall be measured at port MK4.
Commissioning | Hägglunds DUc Drive unit
RE 15326-WA, Version 06.2020, Bosch Rexroth AB
61/88