Servicing Work
Instructions on Design, Operation, Maintenance and Inspection
15
4.3 Bleeding
F
or steering gear versions with automatic bleeding:
Steering gear versions with automatic bleeding do not have any bleed scews. These steering
gears automatically bleed any air remaining within the steering system.
Note:
Automatic bleed valves operate in the idle pressure range only; therefore, any unnecessary pres-
sure build-up should be avoided.
When the steering system is filled to an extent preventing the oil level from dropping below the
upper mark of the oil dipstick:
Have the engine run at low speed for 2...3 minutes.
Rotate the steering wheel several times from lock to lock and, while doing so, watch the oil level.
Top up with oil if required.
In addition, for vehicles equipped with a ground-driven emergency steering pump:
Jack up the drive axle. ¡
With a gear selected and the engine running, bleed the emergency steering pump.
2...3 minutes later rotate the steering wheel several times from lock to lock.
Note:
In the end positions, do not pull heavier at the steering wheel than is necessary to rotate the
steering gear.
Top up with oil if required.
Versions with additional steering cylinder:
The line connections of the steering cylinder must point upward to allow for an escaping of the
air in the cylinder.
If required turn the steering cylinder to a suitable position and mount it again in its original position
after air bleeding.
¡ see vehicle manufacturer’s instructions
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