DAF 95XF. Manual — part 443
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DIAGNOSIS
Contents
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Hydraulic gearbox control (HGS)
DIAGNOSIS
1-1
1. HYDRAULIC GEARBOX CONTROL (HGS)
1.1 FAULT-FINDING TABLE
FAULT: GEARS CANNOT BE ENGAGED
Possible cause
Remedy
Fluid level too low
Check for leaks
Use of incorrect hydraulic fluid
Replace by hydraulic fluid with correct
specification
Use of mineral oils and/or grease
Change entire system
Air in the system (identified by spongy feeling)
Top up and bleed the system
Cylinders disconnected from gearbox
Check attachment and tighten, if necessary
FAULT: NOT ALL OF THE GEARS CAN BE ENGAGED
Possible cause
Remedy
Fluid level too low
Check for leaks
Air in the system (identified by spongy feeling)
Top up and bleed the system
External leakage
Check for external leakage
Displacement of gear lever because of internal
leakage along plungers/pistons
Replace defective cylinder or gear-lever unit
Cylinders disconnected from gearbox
Check attachment and tighten, if necessary
FAULT: DISPLACED POSITION OF GEAR LEVER
Possible cause
Remedy
Internal leakage along plungers/pistons
Replace defective cylinder or gear-lever unit
Displacement of gear lever because of
temperature increase
Slowly move gear lever from rear right (4/8 gear)
to front left (1/5 gear) a number of times
External leakage
Check for external leakage
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DIAGNOSIS
Hydraulic gearbox control (HGS)
1-2
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Mechanical gearbox control (MGS)
DIAGNOSIS
2-1
2. MECHANICAL GEARBOX CONTROL (MGS)
2.1 FAULT-FINDING TABLE
FAULT: GEAR LEVER VIBRATES
Possible cause
Remedy
Excessive play at control hinge points
Check/repair all points in the control
Too much play on the silentblock in the control
rod (loose or defect)
Check silentblock and replace, if necessary
FAULT: ENGAGING GEARS IS HEAVY
Possible cause
Remedy
Gearbox control pivot and hinge points
dry or worn
Check/repair all points in the control
Mechanical problem in gearbox
See fault-finding table “Gearbox, mechanical”
FAULT: GEARS CANNOT BE SHIFTED
Possible cause
Remedy
Gearbox control pivot and hinge points
dry or worn
Check/repair all points in the control
Too much play on the silentblock in the control
rod
Check silentblock and replace, if necessary
Mechanical problem in gearbox
See fault-finding table “Gearbox, mechanical”
FAULT: GEARBOX JUMPS OUT OF GEAR
Possible cause
Remedy
Incorrect control setting
Check/set all points in the control
Mechanical problem in gearbox
See fault-finding table “Gearbox, mechanical”
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