Hägglunds Compact CA, Installation And Maintenance Manual

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Installation and Maintenance Manual, Compact CA
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
setting 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 2.1 "Rec-
ommended charge pressures".
Investigate the drain oil, if
necessary. Put a magnetic plug
in the oil flow and check the ma-
terial 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.
External oil leakage on the motor. The radial lip seal is worn. Replace the radial lip seal.