Troubleshooting
Fig. 26
Fig. 27
36 Instructions on Design, Operation, Maintenance and Inspection
1.5 Checking the belt tension of the pump drive
C
heck the tension of the drive belt. ¡
Even at maximum pump pressure, the drive belt must transmit the power without any slip.
1.6 Checking the hydraulic functioning of pump and steering gear
1.6.1 Installing tool [1] (ZF Servotest tester)
For the implementation of the pressure and leakage oil tests described below, it is necessary to
distinguish 2 kinds (variants ➀
➀➀
➀ and ➁
➁➁
➁) of steering systems.
Variant ➀
➀➀
➀
Steering systems with the pressure relief valve arranged in the pump or in the pressure line
between the pump and tool [1] (ZF Servotest power steering tester) (Fig. 26). This means
that pressure relief takes place ahead of built-in tool [1]. On steering systems of this type the
nameplate of the pump or of the pressure relief valve will indicate the maximum pressure, e.g. 130
bar.
1 Pump
2 Oil tank
3 Pressure line
4 Suction line
5 Return line
6 ZF-Servotest
Tool [1]
7 Pressure-
relief valve
Variant ➁
➁➁
➁
Steering systems with the pressure relief valve arranged in the steering gear or in the pres-
sure line between tool [1] (ZF Servotest power steering tester) and the steering gear (Fig.
27).
On steering systems of this type the nameplate of the steering gear or of the pressure relief valve
will indicate the maximum pressure, e.g. 130 bar.
1 Pump
2 Oil tank
3 Pressure line
4 Suction line
5 Return line
6 ZF-Servotest
Tool [1]
¡ see vehicle manufacturer’s instructions
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