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Fault finding
Fault
The motor does
not operate
The motor rotates
in the wrong direction
The motor runs
erratically
Noise in the motor
External oil leaks
from the motor
Bosch Rexroth Mellansel AB, Intallation and maintenance manual, Hägglunds VI, RE 15310-WA/10.2015
5 Fault finding
Probable cause
Mechanical stop in the system
The motor does not give
sufficient torque due to low
differential pressure across the
motor, compared to the load.
The distributor settings
has been changed.
The motor receives insufficient
or no oil.
Oil connections transposed.
Distributor wrongly fitted.
Pressure or flow variations
in the hydraulic system.
The distributor settings has
been changed.
The motor is running at too
low charge pressure
The distributor settings has
been changed.
Internal motor fault.
The sealing ring in the front
end is worn.
Action
Check the system pressure. If the pressure has risen to the relief
valve setting, remove the load from the drive.
Check pressure level in the system and correct settings of the
pressure relief valve if necessary.
Dismount the safety coupling and distributor. If the coupling halves
have been moved in respect to each other, reset them to original
position using the indication hole (Ø3 mm /0.118 in).
Then fit new pins:
CP 6 x 14 mm (0.236 x 0.551 in) for 44- and 64-series.
CP 8 x 19 mm (0.315 x 0.709 in) for 84-series by drilling on the same
radius as the original pins.
Check through the hydraulic system. Check the motor for external
leakage ("D"-connection).
Reverse connections.
Remove the distributor and safely coupling and replace it for correct
rotation.
Investigate the hydraulic system or mechanical transmission
Dismount the safety coupling and distributor. If the coupling halves
have been moved in respect to each other, reset them to original
position using the indication hole (Ø3 mm /0.118 in).
Then fit new pins:
CP 6 x 14 mm (0.236 x 0.551 in) for 44- and 64-series.
CP 8 x 19 mm (0.315 x 0.709 in) for 84-series by drilling on the same
radius as the original pins.
Adjust to correct level. See 2.1 "Recommended charge pressure".
Dismount the safety coupling and distributor. If the coupling halves
have been moved in respect to each other, reset them to original
position using the indication hole (Ø3 mm /0.118 in).
Then fit new pins:
CP 6 x 14 mm (0.236 x 0.551 in) for 44- and 64-series.
CP 8 x 19 mm (0.315 x 0.709 in) for 84-series by drilling on the same
radius as the original pins.
If possible examine the drain oil. Put a magnet in the oil flow and
examine any material which attaches to it. Steel particles indicate
damage. Note that fine material from the castings may be disposited
and does not mean internal damage in the motor.
Change the sealing ring.
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