DAF 95XF. Manual — part 444
3
DIAGNOSIS
Mechanical gearbox control (MGS)
2-2
1
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3
Pneumatically assisted gearbox control (Servo shift)
DIAGNOSIS
3-1
3. PNEUMATICALLY ASSISTED GEARBOX CONTROL
(SERVO SHIFT)
3.1 FAULT-FINDING TABLE
FAULT: ENGAGING GEARS IS HEAVY
Possible cause
Remedy
Servo shift unit is not functioning
Check the air pipes
Internal air leak of servo shift unit
Check the air seals in the unit
Mechanical problem
See fault-finding tables “Mechanical gearbox
control” and “Gearbox, mechanical”
FAULT: GEARBOX JUMPS OUT OF GEAR
Possible cause
Remedy
Shifting valve in servo shift unit defective
Replace servo shift unit
Mechanical problem
See fault-finding tables “Mechanical gearbox
control” and “Gearbox, mechanical”
1
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3
DIAGNOSIS
Pneumatically assisted gearbox control (Servo shift)
3-2
1
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3
Pneumatic gearbox components
DIAGNOSIS
4-1
4. PNEUMATIC GEARBOX COMPONENTS
4.1 FAULT-FINDING TABLE
FAULT: HIGH OR LOW GROUP SHIFTING IMPOSSIBLE
Possible cause
Remedy
Air pressure too low
Check air supply of circuit 4
Neutral switch valve defective or incorrectly
connected
Connect valve properly or replace
Shift-down safety valve defective
Replace valve
Gear engaging cylinder high/low group defective
Check cylinder and replace, if necessary
FAULT: GEAR ENGAGING CYLINDER HIGH/LOW GROUP SHIFTS WHEN
VEHICLE SPEED IS TOO HIGH
Possible cause
Remedy
Incorrect CTE frequency value
Adjust value
FAULT: DELAYED HIGH OR LOW GROUP SHIFTING
Possible cause
Remedy
Air pressure too low
Check air supply of circuit 4
Piping blocked
Check piping and clean, if necessary
Neutral switch valve defective
Replace valve
FAULT: HIGH - LOW SHIFTING OPERATES IN REVERSE MODE
Possible cause
Remedy
Air pipes to high/low group gear engaging
cylinder incorrectly connected
Connect gear engaging cylinder air pipes
properly
FAULT: LOW GROUP SHIFTING IMPOSSIBLE
Possible cause
Remedy
CTE defective
Check CTE and replace, if necessary
Incorrect vehicle speed signal
Check vehicle speed sensor and replace, if
necessary
Check vehicle speed signal
1
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