DAF 95XF. Manual - part 570
8
DIAGNOSIS
Hydraulic lifting gear
4-2
FAULT: TRAILING AXLE IS LIFTED PARTIALLY, PUMP MOTOR CONTINUES TO OPERATE
Possible cause
Remedy
Not enough oil in the reservoir
Check oil level and top up, if necessary
Opening pressure of pressure-relief valve too
low or valve is leaking
Check the opening pressure of the
pressure-relief valve. Adjust or replace the
valve
The 4/2 valve is leaking
Check the system pressure and subsequently
inspect the 4/2 valve
Insufficient pump delivery due to leakage
between pump and valve block, a worn pump or
a defective motor
Check the system pressure, the pump and the
pump motor
FAULT: PUMP MOTOR CONTINUES TO OPERATE WHILE THE TRAILING AXLE HAS BEEN
FULLY LIFTED OR LOWERED
Possible cause
Remedy
Pressure-relief valve setting too low
Check the opening pressure of the
pressure-relief valve and adjust the
pressure-relief valve
Pressure switch is not functioning
Check the pressure switch and the wiring
Replace the pressure switch, if necessary
Fault in electrical circuit
Check electrical circuit
FAULT: TRAILING AXLE DOES NOT LOWER, PUMP MOTOR IS NOT RUNNING
Possible cause
Remedy
Fault in electrical circuit
Check electrical circuit
FAULT: TRAILING AXLE DOES NOT LOWER, PUMP MOTOR IS OPERATING BUT IS
SWITCHED OFF IMMEDIATELY
Possible cause
Remedy
2/2 valve is not functioning
Check whether the 2/2 valve is activated
The 2/2 and 4/2 valve connectors have been
switched
Check the connection using the wire numbers
Piping kinked
Check piping
1
ǹ 0001