DAF 95XF. Manual — part 569
8
DIAGNOSIS
Single rear axle 1354
2-2
FAULT: VIBRATIONS IN THE DRIVE LINE
Possible cause
Remedy
Lifted trailing axle causes excessive in
spring-leafed models
-
Limit the trailing axle lifting height, see
chapter “Inspection and adjustment”
-
Install a key between the spring assembly
and the spring seat, see chapter “Inspection
and adjustment”
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Tandem rear axle 1355 T
DIAGNOSIS
3-1
3. TANDEM REAR AXLE 1355 T
3.1 FAULT-FINDING TABLE
FAULT: NOISES IN REAR AXLE AND DRIVE ASSEMBLY
Possible cause
Remedy
Oil level too low
Top up oil
Oil with incorrect viscosity
Drain oil and top up
Loosened attachment bolts or broken
differential-lock parts
Drain oil and check drained oil for presence of
pieces of metal
Pinion-bearing play
Adjust and/or replace
FAULT: OIL LEAKAGE
Possible cause
Remedy
Oil level too high
Drain oil
Oil with incorrect viscosity
Replace oil sealing ring
Leaking oil sealing ring
Clean or replace the bleeding system
Bleeding system blocked
Ontluchting reinigen of vervangen
Oil leakage between the differential housing
mating surfaces
Clean mating surfaces and apply new sealing
compound
FAULT: DIFFERENTIAL LOCK IS NOT FUNCTIONING
Possible cause
Remedy
No air pressure at engaging cylinder
Check compressed-air system
Defective pneumatic control
Check or replace pneumatic switch
Defective mechanical switch control
Check switch control
FAULT: DIFFERENTIAL-LOCK WARNING LAMP IS NOT FUNCTIONING
Possible cause
Remedy
Switch on cylinder fitted too high
Readjust switch
Switch on cylinder defective
Replace switch
Fault in electrical circuit
Check electrical circuit
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8
DIAGNOSIS
Tandem rear axle 1355 T
3-2
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Hydraulic lifting gear
DIAGNOSIS
4-1
4. HYDRAULIC LIFTING GEAR
4.1 FAULT-FINDING TABLE
FAULT: TRAILING AXLE DOES NOT LIFT, PUMP MOTOR IS NOT RUNNING
Possible cause
Remedy
Time between lowering and lifting
< 2.5
minutes, causing the time relay to be constantly
reset
After lowering the axle, wait for more than
2.5 minutes before putting the control switch
into the “lifting” position
Fault in electrical circuit
Check electrical circuit
Defective pump motor
Replace pump motor
FAULT: TRAILING AXLE DOES NOT LIFT, PUMP MOTOR IS OPERATING BUT IS SWITCHED
OFF IMMEDIATELY
Possible cause
Remedy
4/2 valve is not functioning
Check whether the 4/2 valve is activated
The 4/2 and 2/2 valve connectors have been
switched
Check the connection using the wire numbers
Piping kinked
Check piping
The pipe connections on the pump unit have
been switched
Check pipe connections
FAULT: TRAILING AXLE IS LIFTED PARTIALLY, PUMP MOTOR IS SWITCHED OFF
Possible cause
Remedy
Pressure switch activates at pressure which is
too low
Check pressure switch cut-out pressure and
replace pressure switch, if necessary
Piping kinked
Check piping
Blocked trailing axle or mechanical linkage of
lifting gear
Check the mechanical linkage
In cold weather conditions: oil with wrong
viscosity applied
Drain the oil and fill the system with the
specified oil
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