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CHAPTER VI COMMON FAULTS AND TROUBLE-SHOOTING
Fault
Cause
Action
Diesel engine cannot
start to run.
Shift is not geared on.
Switch for gearing again, or re-adjust the
variable speed handle of the system
Oil level of the gearbox is too low.
Fuel to the regulated oil level.
Handle rod of the speed changing valve cannot
return to original position.
Find out the reason not returning to right
position and remove.
Speed changing oil pump is damaged or oil
seal is leaking.
Replace oil pump or oil seals
Oil Pump is in poor sucking conditions.
Inspect whether the Oil sucking Pipe fails or
not.
Lack of driving force
Low pressure of the oil outlet port of the torque
converter is low, and the torque converter
voltage fails.
Inspect oil level of the gearbox, clean the oil
filter of the oil pan and oil filter of the outlet.
Engine speed is insufficient.
Inspect engine speed.
Clutch slips
Inspect the speed changing oil pressure and
the oil seal of the piston.
Oil temperature of the torque converter is too
high
When the oil temperature of the torque
converter is higher than 120
℃
, stop the car
for cooling down.
Pressure for changing
speed is too low
Pressure release Valve group fails.
Find out the reasons and perform
maintenance
Oil filter is blocked
Clean the oil filter
Pump Failure
Replace oil Pump
Oil seal of the clutch is leaking oil seriously.
Change oil Seal
Oil level of the
gearbox is increased
Oil flying out from the end of the steering pump
Replace the oil seal of the shaft side of
steering pumps.
Oil flying out from the end of the shaft of the
working pump of the hydraulic system
Replace the oil seal of the shaft ends of the
steering pump.
Oil temperature of
torque converter is too
high.
Oil level of the Gearbox is too high or too low
Fuel to the requested oil level
Clutch slips
Inspect the oil pressure of the clutch
Filter is blocked
Clean oil filter screen and oil filter of the oil
pan of the gearbox.
Speed changing pump is in bad oil suction
condition
Inspect speed changing pump to confirm the
oil hose is offset or blocked
Speed changing pump wears, fuel supply is
insufficient.
Inspect the speed changing pump to confirm
that there is any leakage or not, and remove
it.
Oil cooler partially is blocked
Inspect and clean oil cooler of the gearbox.
Oil deteriorates
Inspect oil used for double change (add
volume and fuel quality) to confirm it meets
the requirements or not
Inspect the oil returning pressure of the
torque converter is not too high or not,
hydraulic resistance is too high may lead to a
rapid increase of the oil temperature in the oil
return system.
Inspect whether the oil temperature meter
and oil temperature sensor are accurate or
not.
