DAF CF65, CF75, CF85 Series . Manual - part 96

©

 200346

1-1

Cab heating

DIAGNOSTICS

ΧΦ65/75/85 series

1

1

1. CAB HEATING

1.1 FAULT FINDING TABLE, CAB HEATING

SYMPTOM: CAB TEMPERATURE TOO HIGH

Possible cause

Remedy

Heater valve cannot be fully closed.

Check the setting of the heater valve.

DIAGNOSTICS

1-2

©

 200346

Cab heating

1

ΧΦ65/75/85 series

1

©

 200346

2-1

Cab suspension

DIAGNOSTICS

ΧΦ65/75/85 series

1

1

2. CAB SUSPENSION

2.1 FAULT-FINDING TABLE, CAB SUSPENSION

Air-sprung cab

SYMPTOM: SUSPENSION TOUCHES BUMP STOP

Possible cause

Remedy

Incorrectly adjusted suspension.

Check setting.

Leaking spring element.

Replace spring element.

Defective height control valve.

Replace height control valve and adjust 
suspension.

Defective valve.

Replace valve.

SYMPTOM: INSUFFICIENT LATERAL DAMPING

Possible cause

Remedy

Worn or damaged horizontal dampers at the rear 
of the cab.

Replace both dampers.

Worn or damaged silentblocks in front cab 
suspension.

Replace both silentblocks.

SYMPTOM: AIR LEAKAGE

Possible cause

Remedy

Damaged air bellows.

Replace air bellows.

Leakage in line connections.

Check line connections. 

Internal leakage of height control valve.

Replace height control valve.

DIAGNOSTICS

2-2

©

 200346

Cab suspension

1

ΧΦ65/75/85 series

1

2.2 FAULT-FINDING TABLE, CAB TILTING MECHANISM

SYMPTOM: TILTING CYLINDER FAILS TO RESPOND

Possible cause

Remedy

Damaged or broken pipe. 

Replace pipe or connection.

Pump reservoir empty.

Top up reservoir and check for leaks.

Worn or damaged cylinder seal.

Replace the cylinder or fit a reconditioning set.

SYMPTOM: PUMP ROD REBOUNDS

Possible cause

Remedy

Return stroke leakage.

Replace the tilting pump.

SYMPTOM: PUMP ONLY FUNCTIONS IN THE LAST PART OF THE STROKE

Possible cause

Remedy

Low oil level in oil reservoir.

Top up oil reservoir.

Leaking inlet valve (ball).

Remove the two-way valve and check the inlet 
valve. Clean it or fit a reconditioning set. 

Polluted inlet strainer.

Clean reservoir and strainer.

SYMPTOM: PUMP OPERATES WITH DIFFICULTY, CYLINDER DOES NOT RESPOND

Possible cause

Remedy

Two-way valve incorrectly fitted after repair.

Remove the notched pin from the two-way valve 
and turn it 180

|. Refit the notched pin in the two-

way valve.

SYMPTOM: PUMP FAILS TO GENERATE PRESSURE

Possible cause

Remedy

Reservoir level too low.

Top up the reservoir.

Leaking inlet valve (ball).

Remove the two-way valve and check the inlet 
valve. Clean it or fit a reconditioning set.

Worn or damaged O-rings on the two-way valve.

Fit a reconditioning set.

Pressure limiting valve incorrectly set.

Check the pressure limiting valve (using a 
pressure gauge only) and adjust, if necessary.