DAF CF65, CF75, CF85 Series . Manual — part 292
3
CF65/75/85 series
Automatic gearbox
DIAGNOSTICS
5-9
Main code
Sub-code
RECOMMENDED PROCEDURES
Range test when using coupling C3
57
11
22
44
66
88
99
Check the following points:
a. Output shaft engine speed sensor and rev sensor are connected.
The connectors are undamaged and clean.
b. No interruptions or short circuits between wires or earth in sensor
wiring.
c. Let the engine idle in neutral while the vehicle is on the brake.
Check the following points:
1. Specified dip stick.
2. Oil level.
d. Check that there is no interruption or short circuit between the wiring
or earth connection in the coupling 3 pressure switch wiring.
e. Check the following points:
1. Main connector is properly connected, is clean and undamaged.
2. ECU connector is properly connected, is clean and undamaged.
3. Rev sensor is properly connected, is clean and undamaged.
If all points are in order, contact your Allison dealer.
Fault in ECU
69
12,13
14,15
16,21
22,23
24,25
26,32
33,34
35,36
1. Delete the fault codes and try to re-start the vehicle.
2. If the fault re-occurs, replace the ECU.
3. If the fault has not been cleared, contact your Allison dealer.
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DIAGNOSTICS
Automatic gearbox
CF65/75/85 series
5-10
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CF65/75/85 series
Clutch
DIAGNOSTICS
6-1
6. CLUTCH
6.1 FAULT-FINDING TABLE
SYMPTOM: CLUTCH PEDAL FAILS TO RETURN
Possible cause
Remedy
Broken pedal return spring
Replace spring
Worn clutch pedal bearing
Check bearing 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 bearing
Check bearing 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.
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DIAGNOSTICS
Clutch
CF65/75/85 series
6-2
SYMPTOM: RESIDUAL PRESSURE IN CLUTCH SYSTEM
Possible cause
Remedy
Bleed in reservoir cap closed off
Check bleed 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.
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 lining 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
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