DAF LF45, LF55 Series. Manual — part 227
©
200508
5-1
Clutch
DIAGNOSTICS
ΛΦ45/55 series
3
1
5. CLUTCH
5.1 FAULT-FINDING TABLE
SYMPTOM: CLUTCH PEDAL FAILS TO RETURN
Possible cause
Remedy
Broken pedal return spring
Replace spring
Worn clutch pedal bearings
Check bearings and replace if necessary
Dirt in hydraulic system
Clean system and fill with fresh fluid
Incorrect fluid in hydraulic system
Replace with fluid of correct specification
Air in hydraulic system
Bleed the system
SYMPTOM: CLUTCH PEDAL STICKS WHEN PRESSED
Possible cause
Remedy
Leak in hydraulic system
Check system
Air in hydraulic system
Bleed hydraulic system
Release bearing incorrectly fitted
Fit the release bearing correctly
Fork hinge points or fork itself worn
Check hinge points and fork; replace if necessary
Defective clutch servo
Repair and/or replace clutch servo
Gearbox front cover worn or broken
Check, replace gearbox front cover
SYMPTOM: PEDAL FORCE TOO HIGH
Possible cause
Remedy
No or insufficient pressure in circuit 4 of the brake
system
Check circuit 4 of the brake system
Kinked air pipe
Check pipe and replace if necessary
Kinked hydraulic pipe
Check pipe and replace if necessary
Worn clutch pedal bearings
Check bearings and replace if necessary
Defective clutch servo and/or main cylinder
Repair or replace clutch servo and/or main cylinder
Note: In the case of a swollen seal, clean the
system and re-fill with new fluid
SYMPTOM: RESIDUAL PRESSURE IN CLUTCH SYSTEM
Possible cause
Remedy
Bleed vent in reservoir cap closed off
Check bleed vent in cap
Compensation bore in main cylinder closed off by
swollen seal or insufficient free thrust pin travel.
Check free thrust pin travel or repair/replace main
cylinder
Note: In the case of a swollen seal, clean the
system and re-fill with new fluid
DIAGNOSTICS
5-2
©
200508
Clutch
1
ΛΦ45/55 series
3
SYMPTOM: FLUID LEAK VIA VENT OPENING
Possible cause
Remedy
Leak through piston seal in clutch servo
Repair or replace clutch servo
Note: A drop of oil in the vent opening is a normal
situation and is not a reason to repair/replace the
clutch servo
SYMPTOM: CLUTCH PLATE SLIPS
Possible cause
Remedy
Worn lining
Replace lining
Oil on lining
Replace linings and check engine and gearbox
sealing rings
Dirt on clutch plate and flywheel
Clean plate and surrounding area
Burnt clutch plate
Check entire clutch and replace if necessary
Clamping force of clutch release assembly too low
or absent
Check clutch release assembly and replace if
necessary
Clutch release assembly is not released
Check clutch release assembly
SYMPTOM: CLUTCH RELEASE ASSEMBLY FAILS TO RELEASE
Possible cause
Remedy
Fluid level in hydraulic system too low
Top up fluid
Incorrect pedal setting
Check setting and adjust if necessary
Air in hydraulic system
Bleed hydraulic system
Leak in hydraulic system
Check hydraulic system
Fingers of clutch release assembly broken
Replace clutch release assembly
Wrong clutch release assembly has been fitted
Fit correct clutch release assembly
Clutch fork is broken
Replace fork
Clutch release assembly badly soiled
Clean entire clutch
Defective clutch servo
Check clutch servo and replace if necessary
Thrust bearing incorrectly fitted
Fit thrust bearing correctly
Clutch housing disconnected from gearbox
Tighten the clutch housing bolts to the correct
torque
©
200508
6-1
Prop shafts
DIAGNOSTICS
ΛΦ45/55 series
3
1
6. PROP SHAFTS
6.1 FAULT-FINDING TABLE
SYMPTOM: VIBRATION IN DRIVE LINE AT LOW SPEED
Possible cause
Remedy
Universal joint angle too large, caused for example
by excessive caster
Check universal joint angle
Play in universal joints
Replace universal joint
Play in suspension bearing
Replace suspension bearing
Play in slide coupling
Replace prop shaft
Forks not in line
Align forks
SYMPTOM: VIBRATION IN DRIVE LINE AT HIGH SPEED
Possible cause
Remedy
Prop shaft imbalance
Balance prop shafts or replace if necessary
DIAGNOSTICS
6-2
©
200508
Prop shafts
1
ΛΦ45/55 series
3
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