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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200346

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.