8
HYDRAULIC LIFTING GEAR
Inspection and adjustment
3-4
3.3 INSPECTION, INTERNAL LEAKAGE PUMP UNIT
1.
Check the setting of the pressure-relief
valve before conducting this test.
2.
Lower the trailing axle. The wheels of the
trailing axle must rest on the ground.
3.
Clean line connection B of the pump unit.
4.
Remove the line from line connection B and
plug the line.
5.
Connect to line connection B the pressure
gauge, special tool (DAF no. 0535653), in
such a way that this also blocks the line
connection.
6.
Put the control switch into the “lifting”
position. The pressure will quickly increase
and the pressure switch will deactivate the
pump motor. Release the control switch.
7.
Take the pressure reading and check the
outward leakage. Leave the pump unit in
pressurized condition, also depending on
the complaint (how quickly the trailing axle
will be lowered by itself). If the pressure
drops, the non-return valve in the 2/2
magnetic valve or the gasket of the 2/2
magnetic valve are leaking.
8.
Manually connect the 2/2 magnetic valve to
a 24V power supply following this test. The
2/2 magnetic valve will be activated,
causing line connection B of the pump unit
to become pressureless.
9.
Remove the pressure gauge and reconnect
the piping.
10. Activate the lifting gear and check the oil
level in the reservoir. Inspect the line
connections for leaks.
B
A
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