DAF CF65, CF75, CF85 Series . Manual - part 97

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 200346

2-3

Cab suspension

DIAGNOSTICS

ΧΦ65/75/85 series

1

1

SYMPTOM: CAB LOCK CANNOT BE OPENED

Possible cause

Remedy

Damaged or broken pipe.

Replace pipe or connection.

Jammed piston in locking mechanism.

Repair or replace the locking mechanism.

SYMPTOM: CAB CANNOT BE TILTED

Possible cause

Remedy

Jammed piston in cab locking mechanism.

Repair or replace the locking mechanism.

Pump fails to generate pressure.

Check the operation of the pump.

DIAGNOSTICS

2-4

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Cab suspension

1

ΧΦ65/75/85 series

1

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3-1

Seats

DIAGNOSTICS

ΧΦ65/75/85 series

1

1

3. SEATS

3.1 FAULT-FINDING TABLE, ISRINGHAUSEN 6800 SERIES

SYMPTOM: SEAT FAILS TO RISE

Possible cause

Remedy

Insufficient system pressure.

Check air supply to the seat.

Blocked bleeding system.

Check bleeding system.

The level control valve pins do not touch the 
running surface of the control discs.

Place seat in its highest position.

SYMPTOM: SEAT MOVES UP AND DOWN INDEPENDENTLY (LOADED)

Possible cause

Remedy

Leaking pneumatic system 

Check level control valve, air suspension and air 
pipes for leakage. Replace components or repair 
air pipe.

Cylinder in control disc unit fails to return to the 
original position.

Loosen cylinder attachment screws and tighten 
slightly (2 Nm).

Not a functioning fault, but excessive resistance in 
the system itself.

SYMPTOM: SEAT HEIGHT CANNOT BE ADJUSTED FOR HEIGHT

Possible cause

Remedy

Adjustment cylinder does not move.

During upward operation of the height control 
valve, check whether the pipe (16) blows off and 
during downward operation, whether the pipe (16, 
17) blows off.
If so, replace the adjustment cylinder.

Defective height adjustment valve (E).

Detach air pipes (9) and (11) from valve (D). Check 
whether air is blown off during operation. If not, 
check whether the control button is controlling the 
valve.
Replace the valve or control button (depending on 
the fault).

Defective switch valve (C).

Disconnect air pipes (5) and (6) and operate height 
control up and down.
If air escapes from the pipes (5) and (6), replace 
the valve (C).

SYMPTOM: SEAT MOVES TO TOP-MOST POSITION AND IS NOT SPRUNG

Possible cause

Remedy

Air connections not installed according to diagram. Correct the incorrect connection(s).

DIAGNOSTICS

3-2

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Seats

1

ΧΦ65/75/85 series

1

SYMPTOM: BLOWS OFF CONTINUOUSLY AND IS PERMANENTLY IN TOP POSITION

Possible cause

Remedy

Air connections not installed according to diagram. Correct the incorrect connection(s).

SYMPTOM: SEAT FUNCTIONS BUT CANNOT MOVE DOWN

Possible cause

Remedy

Kinks in air pipe.

Check the air pipes for kinks.