DAF LF45, LF55 Series. Manual — part 224
©
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
DIAGNOSTICS
2-2
©
200508
Pneumatic gearbox control
1
ΛΦ45/55 series
3
©
200508
3-1
Mechanical gearbox
DIAGNOSTICS
ΛΦ45/55 series
3
1
3. MECHANICAL GEARBOX
3.1 FAULT-FINDING TABLE
COMPLAINT: ENGAGING GEARS IS HEAVY
Possible cause
Remedy
Gearbox oil level too low
Top up oil level
Oil with incorrect specification in the gearbox
Fill gearbox with oil of correct specification
Problem in mechanical gearbox control
See "Mechanical gearbox control" fault-finding
table
Clutch plate is not released
See "Clutch" fault-finding table
COMPLAINT: GEARS CANNOT BE ENGAGED
Possible cause
Remedy
Retaining element fitted too deep
Check/repair retaining elements
Problem in mechanical gearbox control
See "Mechanical gearbox control" fault-finding
table
Range-change switch does not work properly
See "Pneumatic section of gearbox control" fault-
finding table
COMPLAINT: GEARBOX JUMPS OUT OF GEAR
Possible cause
Remedy
Adjustment of gearshift cover on gearbox
Mount gearshift cover on gearbox without any play
Defective retaining element or wrong type of
retaining element fitted in gearshift cover
Replace retaining element or fit other type of
retaining element
Problem in mechanical gearbox control
See "Mechanical gearbox control" fault-finding
table
COMPLAINT: SINGLE H BECOMES DOUBLE H
Possible cause
Remedy
Locking plate in control cover not positioned
correctly
Check assembly of control cover
DIAGNOSTICS
3-2
©
200508
Mechanical gearbox
1
ΛΦ45/55 series
3
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