139
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
the oil temperature meter, oil
temperature sensor is accurate or not.
The idle stroke of
the steering wheel
is over-sized.
Loose steering wheel nut
Make adjustment as required
Worn or damaged connection
between steering column and
steering gear
Disassemble and repair
