DAF CF75 Series - Pneumatic Section of Gearbox

3
CF65/75/85 series Pneumatic section of gearbox
DIAGNOSTICS
3-1
3. PNEUMATIC SECTION OF GEARBOX
3.1 FAULT-FINDING TABLE
SYMPTOM: NOT POSSIBLE TO ENGAGE HIGH OR LOW RANGE
Possible cause Remedy
Air pressure too low Check air supply of circuit 4
Neutral position valve defective or incorrectly
connected
Connect valve properly or replace
Defective downshift protection valve Replace valve
Defective high/low range engaging cylinder Check cylinder and replace if necessary
SYMPTOM: HIGH/LOW RANGE ENGAGING CYLINDER ENGAGES AT TOO HIGH A SPEED
Possible cause Remedy
Incorrectly programmed VIC Report the incorrect or altered configuration
SYMPTOM: HIGH OR LOW RANGE ENGAGING IS SLOW
Possible cause Remedy
Air pressure too low Check air supply of circuit 4
Pipes blocked Check pipes and clean if necessary
Defective neutral position valve Replace valve
SYMPTOM: THE HIGH/LOW GROUP ENGAGING WORKS IN REVERSE
Possible cause Remedy
Air pipes on the high/low range engaging
cylinder are incorrectly connected
Connect engaging cylinder air pipes correctly
SYMPTOM: NOT POSSIBLE TO ENGAGE LOW RANGE
Possible cause Remedy
No power supply to the downshift protection
valve
Check the wiring
Incorrect vehicle speed signal Check vehicle speed signal
Faulty VIC electronic unit Replace VIC if necessary
1
ᓻ 200337
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