PREVOST X3-45 Multiplex User Manual

Troubleshooting
Instructions on Design, Operation, Maintenance and Inspection
37
Fit tool [1] (ZF Servotest) to variants ➀
➀
➀
➀ or ➁
➁➁
➁ in such a way that the readings can be seen from
the driver’s seat.
Check the oil level and bleed the steering system - see Chapter III.
Test conditions: oil temperature 50
°
C
1.6.2 Checking the maximum pressure of the ZF pump
Read the maximum permissible pressure from the nameplate of the steering gear/the pump or of
the separately arranged pressure relief valve. Start the engine.
Set the pressure relief of tool [1] (ZF Servotest) to a value excluding any damages to the steering
system during the tests decribed below.
1.6.2.1 For steering systems with pressure relief ahead of tool [1]: Variant ➀
➀➀
➀
Have the engine run at idling speed.
Close the shut-off valve of tool [1] (ZF Servotest) and read the maximum pressure.
Attention:
Admit maximum pressure for a short time only (10 seconds maximum) to avoid an excessive
heating-up of the inner parts of the pump and, in consequence, a premature wear of these parts.
Specified value: maximum pressure (see nameplate) +10 %
Open the shut-off valve again.
Wird der Sollwert nicht erreicht Pumpe ersetzen bzw. reparieren.
1.6.2.2 For steering systems with pressure relief aft of tool [1]: Variant ➁
➁➁
➁
Attention:
If tool [1] is installed to variant ➁ make absolutely sure that during the entire period of pressure
testing the engine is running at idling speed, only. An increase in engine speed would entail an
immediate and sharp rise in system pressure which could cause a damage to the pressure line/the
pump.
Have the engine run at idling speed.
While watching the pressure gauge of tool [1], slowly close the shut-off valve until the maximum
pressure indicated is reached.
Do not close the shut-off valve any further. Admit maximum pressure for a short time only (maxi-
mum 10 seconds) to avoid an excessive heating of the inner parts of the pump.
Have the shut-off valve return to its initial position.
If maximum pressure is not reached during this measurement, the pump has to be replaced or
repaired.

PREVOST X3-45 Multiplex Specifications

General

Length	45 ft
Width	102 in
Engine	Volvo D13
Horsepower	500 hp
GVWR	54, 000 lbs
Height	146 in
Sleeping Capacity	Varies based on floor plan
Water Capacity	Varies based on floor plan