Troubleshooting - Bosch Rexroth Hagglunds CA Series Installation & Maintenance Manual

Table 24: Troubleshooting hydraulic motor
Fault
The motor does not run.
Motor rotates in wrong direction.
Motor runs rough.
Noise in the motor.
External oil leakage on the motor.
Troubleshooting | Hägglunds CA Radial piston hydraulic motor

14 Troubleshooting

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Probable cause
Mechanical stop in the drive.
The motor does not deliver enough torque
because the pressure difference across the
motor is not enough for the load.
Insufficient or no oil being supplied to
motor.
Oil supply connections to motor incorrectly
connected.
Pressure or flow fluctuations in the
hydraulic system.
The motor is being operated with too low
charge pressure.
Internal faults in the motor.
The radial lip seals or other seals is worn
or damaged.
Action
Check system pressure. If the pressure has
risen to the relief valve setting, remove the
load from the drive.
Investigate the pressure level in the system
and correct the setting of the pressure
limiting valve if necessary.
Check the hydraulic system. Check
the external leakage of the motor (D
connection).
Connect the oil supply correctly.
Find the cause in the system or in the
driven unit.
Adjust the charge pressure to the correct
level. See chapter Recommended charge
pressure in data sheet
Investigate the drain oil, if necessary. Put
a magnetic plug in the oil flow and check
the material that sticks to the magnet.
Steel particles indicate damage. Note
that fine material from the castings may
be deposited and does not mean internal
damage in the motor.
Replace the damaged seals.
RE 15305-WA, Version 11.2019, Bosch Rexroth AB
73/76
RE 15305.