DAF CF65, CF75, CF85 Series . Manual — part 294
3
CF65/75/85 series
ZF intarder
DIAGNOSTICS
8-1
8. ZF INTARDER
8.1 FAULT-FINDING TABLE
SYMPTOM: NO BRAKING MOMENT
Possible cause
Remedy
Oil level too low
Check oil level
Intarder is not filled with the specified oil
Change the oil
No pump pressure
Check system
No control pressure
Check system
No intarder pressure
Check system
SYMPTOM: INSUFFICIENT BRAKING MOMENT
Possible cause
Remedy
Oil level too low
Check oil level
Intarder is not filled with the specified oil
Change the oil
Pump pressure too low
Check system
Control pressure too low
Check system
Intarder pressure too low
Check system
Freewheeling turning torque system remains
fully or partly switched on
Check the free movement of the plungers in the
freewheeling turning torque system
SYMPTOM: CONSTANT BRAKING MOMENT WHEN INTARDER IS SWITCHED OFF
Possible cause
Remedy
Oil level too high
Check oil level
Control pressure is independent of the position
of the control lever
Check system
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DIAGNOSTICS
ZF intarder
CF65/75/85 series
8-2
SYMPTOM: DELAYED RESPONSE
Possible cause
Remedy
Air supply absent/too low
Check air supply
Intarder air supply valve is not activated
Check system
Intarder air supply valve does not empty
accumulator in spite of activation
Check system
Idle pressure too low
Check system
SYMPTOM: DELAYED SWITCH-OFF
Possible cause
Remedy
Slow decrease of intarder pressure after
switch-off
Check system
SYMPTOM: OIL LEAK
Possible cause
Remedy
Oil level too high
Check oil level
Oil leak between gearbox housing and intarder
Replace gasket
Oil leak in pump
Replace O-ring
Oil leak in proportional valve
Replace O-ring
Oil leak in the accumulator
Replace O-ring
Oil leak in the prop shaft flange
Replace O-ring
SYMPTOM: AIR LEAKAGE
Possible cause
Remedy
Air leak via intarder air supply valve
Replace O-ring
SYMPTOM: COOLANT TEMPERATURE TOO HIGH
Possible cause
Remedy
Coolant level too low
Check coolant level
Temperature adjustment
Check system
Intarder pressure present after intarder has been
switched off
Check system
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CF65/75/85 series
AS Tronic
DIAGNOSTICS
9-1
9. AS TRONIC
9.1 FAULT-FINDING TABLE
Using DAVIE, the air pressure can be examined
after the pressure regulator. The air pressure
before the pressure regulator can be measured
using a pressure gauge on the screw valve of
the AS Tronic air reservoir.
SYMPTOM: AIR SUPPLY PRESSURE TOO LOW
Possible cause
Remedy
Air supply pressure too low due to:
-
Air leakage in air pipe from air supply unit to
modulator pressure regulator
-
Pressure regulator factory setting disrupted
Check the following air connections:
-
Non-return valve at output 26 of the air
supply unit
-
Pressure relief valve on transverse support in
front of left front wheel
-
Both connections and valve on air reservoir
of AS Tronic
-
Air connection of T-piece on modulator
pressure regulator
-
Sealing ring between pressure regulator and
modulator upper cover
-
Pressure regulator set screw seal (underside
of pressure regulator under plastic cover)
-
Air lead-through sealing ring between
modulator upper and lower covers
-
Air connection on clutch unit
-
Bleed screw, clutch unit
Defective or incorrectly functioning pressure
regulator on modulator
-
Replace pressure regulator
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3
DIAGNOSTICS
AS Tronic
CF65/75/85 series
9-2
SYMPTOM: AIR SUPPLY PRESSURE TOO HIGH
Possible cause
Remedy
-
Defective or incorrectly functioning pressure
regulator on modulator
-
Pressure regulator factory setting disrupted
-
Check pressure regulator set screw seal
(underside of pressure regulator under plastic
cover)
-
Replace pressure regulator
SYMPTOM: SYSTEM NOT AVAILABLE ONCE ENGINE STARTED
Possible cause
Remedy
During the system self-test clutch conditions
cannot be stored due to:
-
jammed clutch plate on gearbox input shaft
-
clutch valves in clutch unit mechanically
locked in open or closed position
Check whether clutch is released during self-test.
-
Remove inspection cover from clutch and
check whether clutch operating unit changes
position during self-test
-
If necessary replace the clutch unit
-
If necessary remove the gearbox so as to
check the clutch parts
SYMPTOM: GEAR IS NOT ENGAGED WHEN OPERATING UNIT HAS BEEN SWITCHED ON VIA
SELECTOR SWITCH
Possible cause
Remedy
Signal of selected driving position from selector
switch not received by gear lever unit
Check whether the wire from the relevant
selector switch driving position to the gear lever
unit is interrupted.
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