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