76
Fault Finding
CHART E1—Dumper gearbox
A
If the transmission is noisy start at check 1
B
If the transmission is overheating start at check 4
C
If the transmission will not pull start at check 12
D
If there is no drive in one or both directions start at check 17
E
If the transmission is jumping out of gear start at check 29
F
If the transmission is sticking in gear start at check 39
G
If the rations are crash changing start at check 41
Cause
Remedy
Dumper will not drive forward/reverse.
Check handbrake released.
Check FNR lever engaged.
Check fuses.
Check drive inhibit relay.
Check forward & reverse relays
Check operation of solenoid valve on top of the gearbox
Check selector lever is engaging the gears on the gearbox turret
Check handbrake sensor switch
Check transmission oil level
Check
Action
1
Is there noise when selecting direction?
YES: Check 3
NO: Check 2
2
Is there noise when running with direction selector in neutral and
ratio selector in 1st?
YES: Check 9
NO: Check 19
3
Is there air in the hydraulic system?
YES: continue running to expel air
NO: Check 4
4
Is the fluid level correct?
YES: Check 5
NO: Check level only when machine
is cold & top up as required
5
Are the oil passages restricted?
YES: Clear the restriction
NO: Check 6
6
Is the suction strainer restricted?
YES: Remove & clean strainer
NO: Check 7
7
Is pump pressure as specified?
YES: Check 9
NO: Check clutch pressure
maintenance valve is free to
operate
8
When flow testing pump is output low?
YES: Renew pump
NO: Check converter sprag clutch for
wear or slip