Edition 2 Chapter 2 Page 2-9
Feb/2013 Troubleshooting
2.8 TRANSMISSION
Table 2-8
Part Problem Cause Remedy
Transmission
Control
pressures in
the full gear
range are low
a) Pressure gauge defective Replace the pressure
gauge
b) Control oil pipeline leaks Examine oil pipeline and
replace control valve
c) Oil pump pressure is not sufficient Repair or replace oil pump
d) The control valve mount bolts are
loose.
Tighten bolts
Transmission
overheating
a) Oil pump pressure is not sufficient
due to oil level to high or too low,
or incorrect oil type
Examine and adjust oil
quality & level to the
requirements.
b) Traveling on a slope over 12° for
a long period of time or exposed
to high ambient temperature
Stop the engine and lower
the oil temperature.
c) Traveling slow for a long period of
time
Stop at an interval to let
the engine and
transmission temperatures
adjust.
d) Engine RPM is too high. Examine and control the
engine control to make the
highest engine RPM agree
with the requirements.
Unusual
transmission
noise
Knocking Sound
a) Caused by bumping
between gear and tooth face
in the gear box which could
be verified by sparkle
generated by tooth face
compressing test. When the
gear is bearing load, the
noise could be more
extreme. It shows that the
gear is defected if you can
hear noise when the gear is
engaged.
Use whetstone and manual
grinding wheel to smooth
out rough spots.
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