Bosch Rexroth Hagglunds VI 64 Series - Fault Finding

60/68 Fault nding
Bosch Rexroth Mellansel AB, Intallation and maintenance manual, Hägglunds VI, RE 15310-WA/10.2015
5 Fault nding
Fault Probable cause Action
The motor does
not operate
Mechanical stop in the system
Check the system pressure. If the pressure has risen to the relief
valve setting, remove the load from the drive.
The motor does not give
sucient torque due to low
dierential pressure across the
motor, compared to the load.
Check pressure level in the system and correct settings of the
pressure relief valve if necessary.
The distributor settings
has been changed.
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 t 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.
The motor receives insucient
or no oil.
Check through the hydraulic system. Check the motor for external
leakage (”D”-connection).
The motor rotates
in the wrong direction
Oil connections transposed. Reverse connections.
Distributor wrongly tted.
Remove the distributor and safely coupling and replace it for correct
rotation.
The motor runs
erratically
Pressure or ow variations
in the hydraulic system.
Investigate the hydraulic system or mechanical transmission
The distributor settings has
been changed.
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 t 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.
Noise in the motor
The motor is running at too
low charge pressure
Adjust to correct level. See 2.1 ”Recommended charge pressure”.
The distributor settings has
been changed.
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 t 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.
Internal motor fault.
If possible examine the drain oil. Put a magnet in the oil ow and
examine any material which attaches to it. Steel particles indicate
damage. Note that ne material from the castings may be disposited
and does not mean internal damage in the motor.
External oil leaks
from the motor
The sealing ring in the front
end is worn.
Change the sealing ring.