Operation Description
50
2.19.2 Gearbox Fault and Troubleshooting
Table 2-5 Gearbox Faults and Troubleshooting
Fault
Causes
Solutions
Putting the tractor
into gear is difficult
or impossible
(1) Clutch has not disengaged completely
(2) Gearshift interlocking rod is too long
(3) The shift lever fork is severely worn
(4) The end face of the engagement sleeve or
the end face of the gear is worn or broken
(1) Troubleshoot according to the
clutch type
(2) Shorten the gearshift
interlocking pull rod
(3) Replace the shift lever
(4) Replace or repair
Gearshift disengages
automatically
(1) The gearshift interlocking rod is too short
(2) The locating slot of the shifting fork shaft
is severely worn
(3) The spring pressure of the interlocking
latch is insufficient
(4) The bearing on the gear shaft is worn,
making the shaft tilt
(5) The spline of the tooth holder is worn
(1) Lengthen the gearshift
interlocking pull rod
(2) Replace the shift fork
(3) Adjust or replace the
interlocking pin spring
(4) Replace the bearing
(5) Replace the tooth holder
Random gear shifting
(1) The shift lever fork is worn
(2) The gear guide plate is severely worn
(3) The fork slot of the shifting fork and the
meshing bush are worn
(4) Locating pin of interlocking pin and shift
fork is severely worn
(1) Repair or replace the
shift lever
(2) Replace the gearbox
guide plate
(3) Replace the shifting fork and
the meshing bushing
(4) Replace the interlocking pin
and the shift fork shaft
Noise or impact sound
from the gear box
(1) The gear is excessively worn and/or the
tooth surface has chipped off
(2) The bearing is badly worn or damaged
(3) The lubricating oil is insufficient or oil
quality does not conform to
the specifications
(1) Replace the gear
(2) Replace the bearing
(3) Fill or replace lube oil
Oil goes into gearbox
body or clutch housing
(1) Failure of the rear oil seal of the engine
crank shaft
(2) No. 1 bearing oil seal seat or No. 1
transmission shaft failure
(1) Replace
(2) Replace
Oil coming from
gear shift lever
(1) Plugged air filter element for the rear axle
or for the gearbox cover
(1) Clean or replace filter