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Troubleshooting
Bosch Rexroth AB
, RE 15300-WA, Version 06.2021
Table 20: Troubleshooting hydraulic motor
Fault
Probable cause
Action
The motor does not run.
Mechanical stop in the drive.
Check system pressure. If the pressure has
risen to the relief valve setting, remove the
load from the drive.
The motor does not deliver enough torque
because the pressure difference across the
motor is not enough for the load.
Investigate the pressure level in the system
and correct the setting of the pressure limiting
valve if necessary.
Insufficient or no oil being supplied to motor.
Check the hydraulic system. Check the
external leakage of the motor (D connection).
Motor rotates in wrong direction.
Oil supply connections to motor incorrectly
connected.
Connect the oil supply correctly.
Motor runs jerkily.
Pressure or flow fluctuations in the hydraulic
system.
Find the cause in the system or in the driven
unit.
Noise in the motor.
The motor is being operated with too low
charge pressure.
Adjust the charge pressure to the correct level.
See chapter, Recommended charge pressure
in data sheet
Internal faults in the motor.
Check the magnetic plug 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. Investigate the drain oil.
External oil leakage on the motor.
The radial lip seals or other seals is worn or
damaged.
Replace the damaged seals.
14 Troubleshooting
Please, contact your nearest Bosch Rexroth representative.