Troubleshooting - Bosch Rexroth Hägglunds CA Series Installation And Maintenance Manual

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Troubleshooting

Table 17: Troubleshooting hydraulic motor
Fault
The motor does not run.
Motor rotates in wrong direction.
Motor runs jerkily.
Noise in the motor.
External oil leakage on the motor. The radial lip seal is worn.
RE 15354-WA/04.2015, Installation and maintenance manual, Hägglunds CA 10 - CA 40, Bosch Rexroth Mellansel AB
14 Troubleshooting
Please, contact your nearest Bosch Rexroth representative.
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.
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 15.1.2: Recommended charge
pressure
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 radial lip seal.