Claas LEXION 480, Repair Manual

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188 678.1 - RHB LEXION 480
2.2.1
Steering
STEERING
Scenes of failures on the Orbitrol steering unit
External leaks
External leaks are identified by oil leaking from the
valve block and steering block mounting faces, by oil
leaking from the pressure relief valve and from the
shock valve.
Cause:
1. O-rings on the flange do not seal properly.
2. O-rings on the adjustment screw of the pressure
relief valve do not seal properly.
3. O-rings on the shock valve plug do not seal
properly.
Remedy:
In case of leaks replace the respective O-rings by
new ones.
Internal leaks
Internal leaks might be the reason when the rear
wheels do not respond immediately to steering on soft
ground, or when no firm resistance is felt on the
steering wheel when the rear wheels are turned all the
way to the to the left or right end position.
Cause:
The oil is leaking from the internal O-rings of the shock
valve.
Remedy:
1. If oil is leaking from the valve block or steering
block mounting faces, replace the shock valve
O-rings by new ones.
2. If oil is leaking from the pressure relief valve, the
shock valve and in case of internal leaks, replace
the complete valve block by a new one.
Steering