DAF 95XF. Manual — part 766
9
DIAGNOSTICS
Leaf suspension
2-2
SYMPTOM: BROKEN SPRING
Possible cause
Remedy
Regular overloading.
Adjust vehicle loading.
Driving too fast over bad roads.
Adjust speed when the road is bad.
Notching effect due to welding or grinding
activities.
Cover spring assembly when welding or
grinding.
Spring damaged due to impact of a steel
hammer.
Never hit the springs using a steel hammer or
some other hard tool.
Incorrect repair of a spring leaf which has
broken before.
When replacing a broken spring leaf, always
replace the leaf above and below the broken
leaf, or replace the entire spring assembly.
Spring has been heated.
Replace spring assembly. Springs should never
be heated.
SYMPTOM: SPLAYING OF THE SPRING ASSEMBLY (BROKEN SPRING CLAMPS)
Possible cause
Remedy
Incorrect pre-tension of the U-bolts.
See symptom: Loose U-bolts.
SYMPTOM: SPRING HITS END STOP
Possible cause
Remedy
Vehicle overloaded.
Adjust vehicle loading.
Sagged spring assembly.
Check spring opening of both spring assemblies.
Replace spring assemblies.
Broken spring.
See symptom: Broken spring.
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9
Leaf suspension
DIAGNOSTICS
2-3
SYMPTOM: SHIFTING OR BREAKING OF CENTRE BOLT
Possible cause
Remedy
Incorrect pre-tension of the U-bolts.
See symptom: Loose U-bolts.
SYMPTOM: BUMPING OR CHATTERING OF THE SPRING
Possible cause
Remedy
Shackle pin bearing play at air-sprung front axle.
Replace shackle pin/bearing bush.
Loose U-bolts.
See symptom: Loose U-bolts.
Loose shackle pin locking at air-sprung front
axle.
Secure the shackle pin locking.
Spring bracket is loose.
Secure the spring bracket.
Spring comes into contact with other
components during spring action.
Check freedom of movement of spring.
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9
DIAGNOSTICS
Leaf suspension
2-4
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9
Rear axle alignment
DIAGNOSTICS
3-1
3. REAR AXLE ALIGNMENT
3.1 FAULT-FINDING TABLE
SYMPTOM: AXLE MISALIGNMENT
Possible cause
Remedy
Axle suspension clearance.
Check the axle suspension. Replace the worn
parts.
Loose U-bolts.
Check the tightening torques of the U-bolts.
Tighten the nuts to the specified tightening
torques.
Shifted centre bolt.
Check the centre bolt. Check the tightening
torques of the U-bolts.
Loose or shifted front spring bracket.
Check the spring brackets. Fit the spring bracket
as specified.
Incorrect spring bracket fitted.
Fit the spring bracket as specified.
Sagged spring assembly or spring assembly
with broken spring leaves.
Check opening of both spring assemblies.
Replace spring assemblies.
Difference in length between the spring
assemblies.
Measure the centre-to-centre distance between
shackle pin and centre bolt.
Adjust the alignment or replace the spring
assemblies.
Misalignment of the vehicle due to wrongly
adjusted or defective height adjustment.
Check / replace sensor. Recalibrate.
Bent torque rod (air suspension and tandem
axle).
Check the torque rods. Replace if necessary.
Incorrectly fitted torque rods (air suspension and
tandem axle).
Check the torque rods. Fit the torque rods
correctly.
Difference in length between the torque rods at
the vehicle’s left and right sides (air suspension
and tandem axle).
Measure the length of the torque rods. Adjust
the difference in length.
Bent axle housing.
Check the straightness of the axle housing. If
possible, adjust by changing the axle alignment.
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