Servicing Work
14 Instructions on Design, Operation, Maintenance and Inspection
To achieve a quick draining, open the one among the components referred to above which is
l
owest in the installed position.
Rotate the steering gear manually from lock to lock until no more oil is draining.
Unscrewed components must be screwed in again at the following tightening torques:
Screw plug (55): 40 Nm (M16x1.5)
50 Nm (M18x1.5)
Collar nut (21 and 129): 20+10 Nm
Screw (20 and 128): 12+3 Nm
Bleeder (57): 30 Nm
Note:
Even after unscrewing all components mentioned above, a residual oil quantity may be left over
in the steering gear.
A complete draining of the steering gear may be necessary depending on the amount of impurities
in the oil. To this effect the steering gear has to be removed from the vehicle and opened at a
ZF Service Centre.
4.2 Oil filling
Attention:
When the steering system is filled with oil, there is a risk of impurities getting into the steering oil
circuit. To avoid malfunctions caused by foreign bodies in the system, maximum cleanliness is of
paramount importance both at initial fill and when topping up with oil.
For admitted oil grades, refer to the List of Lubricants TE-ML 09.
Fill the tank with oil to the rim.
Start the engine and have it run at idling speed to fill the steering system with oil.
During this operation, the oil level in the tank will quickly drop.
Therefore, to avoid any suction of air, the oil tank has to be topped up constantly.
In addition, for vehicles equipped with a ground-driven emergency steering pump:
Jack up the drive axle. ¡
Select a gear and have the engine run at idling speed.
To avoid any suction of air, constantly top up with oil.
¡ see vehicle manufacturer’s instructions
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