Servicing Work
18 Instructions on Design, Operation, Maintenance and Inspection
Test temperature: 50
°
C ±1
0
°
Rigid axle:
Relieve the axle by jacking it up or place it on swivel plates. ¡
Single-wheel suspension:
Place the steered wheels on swivel plates.
With the engine running at idling speed, rotate the steering gear to the lock stop.
Upon reaching the lock stop, overcome the return force of the steering valve by rotating the steer-
ing wheel further for a short time (5 sec. maximum) until a positive steering stop is reached.
Read the pressure at the pressure gauge or at tool [1] (ZF Servotest power steering tester).
Specified values: Steering systems up to 16 dm
3
/min: 40...50 bar
u
p to 20 dm
3
/min: 50...60 bar
above 20 dm
3
/min: 70...80 bar
To correct, slacken the corresponding collar nut (21 or 129) and screw the set screw (20 or 128)
Fig. 14 in or out.
If a higher pressure is measured, the corresponding set screw must be screwed in further.
If a lower pressure is measured, the corresponding set screw must be screwed out further.
While doing so, release the steering wheel so that idle pressure only can build up during this work.
Then tighten the collar nut (21 or 129) using a torque of 20+10 Nm.
Attention:
During the setting operation as well as in the built in condition, the set screws (20 and 128) must
be screwed in at least 3 threads deep for otherwise, because of insufficient thread overlap, they
would run the risk of being ejected when maximum pressure is built up in the steering gear.
¡ see vehicle manufacturer’s instructions
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