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Installation and Maintenance Manual, Compact CBP
Fault finding
5. FAULT FINDING
Hydraulic motor
Fault
Probable cause
Action
The motor does not run.
Mechanical stop in the drive.
The motor does not deliver
enough torque because the pres-
sure difference across the motor
is not great enough for the load.
Insufficient or no oil being sup-
plied to motor.
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 set-
ting of the pressure limiting valve
if necessary.
Check the hydraulic system.
Check the external leakage of
the motor. (The 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
the charge pressure too low.
Internal faults in the motor.
Adjust the charge pressure to the
correct level. See .1 "Recom-
mended charge pressures".
Investigate the drain oil, if neces-
sary. 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 cast-
ings may be desposited and
does not mean internal damage
in the motor.
External oil leakage on the mo-
tor.
The radial lip seal is worn.
Replace the radial lip seal.
