DAF 95XF. Manual — part 765
9
DIAGNOSTICS
Contents
2
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Shock absorbers
DIAGNOSTICS
1-1
1. SHOCK ABSORBERS
1.1 FAULT-FINDING TABLE
SYMPTOM: SHOCK ABSORBER PRODUCES NOISE (CHATTERING, BUMPING ETC.)
Possible cause
Remedy
Shock absorber is loose.
Tighten the shock absorber.
Attachment rubbers too soft.
Fit new rubbers.
Shock absorber comes into contact with other
components.
Remove components or fasten them.
Shock absorber cover is loose.
Tighten cover or replace shock absorber.
SYMPTOM: SHOCK ABSORBER DOES NOT FUNCTION
Possible cause
Remedy
Internal shock absorber defect.
Replace the shock absorber.
Shock absorber leaks oil.
Replace the shock absorber.
SYMPTOM: LEAKY SHOCK ABSORBER
Possible cause
Remedy
Defective piston rod sealing.
Caution: a thin, greasy layer is normal.
Replace the shock absorber.
SYMPTOM: SHOCK ABSORBER TOO HARD
Possible cause
Remedy
Incorrect shock absorber type fitted.
Fit correct shock absorber type.
Internal shock absorber defect.
Check shock absorber using a test bench and
replace, if required.
SYMPTOM: SHOCK ABSORBER TOO SOFT
Possible cause
Remedy
Incorrect shock absorber type fitted.
Fit correct shock absorber type.
Internal shock absorber wear.
Check shock absorber using a test bench and
replace, if required.
Shock absorber leaks oil.
Replace the shock absorber.
Vehicle overloaded.
Adjust vehicle loading.
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DIAGNOSTICS
Shock absorbers
1-2
SYMPTOM: INADEQUATE DRIVING CHARACTERISTICS/FLAT WEAR SPOTS ON THE TYRES
Possible cause
Remedy
Incorrect damping.
Check shock absorbers using a test bench and
replace, if required.
Vehicle overloaded.
Adjust vehicle loading.
SYMPTOM: SHOCK ABSORBER HITS END STOP
Possible cause
Remedy
Defective stop rubber.
Replace stop rubber.
Insufficient damping.
See under: Shock absorber too soft.
Vehicle overloaded.
Adjust vehicle loading.
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Leaf suspension
DIAGNOSTICS
2-1
2. LEAF SUSPENSION
2.1 FAULT-FINDING TABLE
SYMPTOM: LOOSE U-BOLTS
Possible cause
Remedy
Use of a U-bolt or nut of an incorrect property
class.
Use U-bolts and nuts of the correct property
class.
The tightening torque used for the U-bolt nut
was too low.
Tighten the U-bolt to the specified torque.
Reuse of a U-bolt with corroded or damaged
thread.
Fit new U-bolt.
No or inadequate cleaning of the thread (which
includes removal of paint) before reuse of the
U-bolt.
Thoroughly clean the thread when reusing it.
No oil or faulty application of oil on the thread
and the bearing surface of the nut.
Apply the oil as prescribed.
The nut has been tightened using a tool rotating
too fast. There is a risk of the nut being welded
to the thread.
Tighten the nut slowly.
Coating (i.e. paint) on the contact faces of the
connection.
Clean the contact faces before assembly.
Inadequate retorquing of the U-bolt nut or no
retorquing.
Tighten the U-bolt nut as specified.
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