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200508 2-1
Pneumatic gearbox control
DIAGNOSTICS
ΛΦ45/55 series
3
1
2. PNEUMATIC GEARBOX CONTROL
2.1 FAULT-FINDING TABLE
COMPLAINT: 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
Faulty downshift protection valve Replace valve
Defective high/low range engaging cylinder Check cylinder and replace if necessary
COMPLAINT: HIGH/LOW RANGE ENGAGING CYLINDER ENGAGES LOW AT TOO HIGH A
SPEED
Possible cause Remedy
Incorrect VIC frequency value Adjust value
COMPLAINT: HIGH OR LOW RANGE ENGAGING IS SLOW
Possible cause Remedy
Air pressure too low Check air supply of circuit 4
Piping blocked Check piping and clean, if necessary
Defective neutral position valve Replace valve
COMPLAINT: HIGH/LOW RANGE ENGAGING CYLINDER WORKS THE WRONG WAY ROUND
Possible cause Remedy
Air pipes on the high/low range engaging cylinder
are incorrectly connected
Connect engaging cylinder air pipes correctly
COMPLAINT: NOT POSSIBLE TO ENGAGE LOW RANGE
Possible cause Remedy
VIC defective Check VIC and replace, if necessary
Incorrect vehicle speed signal Check vehicle speed signal
DAF LF Gearboxes and Clutch Service Manual
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