Nortrac XT25 - Page 42

Operation Description
36
Fault Fault Reasons Troubleshooting
3. Tractor
shakes when
starting.
(1) Disengaging lever heads are not on the
same plane.
(2) Oil stain on the friction lining and clutch
plate.
(3) The clutch plate is severely warped.
(4) The bolt for the flywheel and the clutch is
loose.
(1) Adjust according to requirements.
(2) Clean friction lining and clutch plate.
(3) Replace driven disk.
(4) Immediately stop the vehicle and
troubleshoot.
2.16.1.2 Gearbox fault and troubleshooting
Table 2-5 Gearbox Faults and Troubleshooting
Fault Fault Reasons Troubleshooting
1 Putting the
tractor in to
gear is difficult
or impossible.
(1) Clutch is not disengaged completely.
(2) Gearbox interlocking pull rod is too long.
(3) Shift lever fork is severely worn.
(4) The meshing bush end surface and gear
end surface is worn or broken.
(1) Troubleshoot according to the clutch
type.
(2) Shorten the gearbox interlocking pull
rod.
(3) Replace the shift lever.
(4) Replace or repair.
2 Shift
disengages
automatically.
(1) The gearbox interlocking pull rod is too
short.
(2) Locating slot of the shift fork severely
worn.
(3) The pressure of interlocking pin spring is
inadequate.
(4) The bearing on the gear shaft is worn.
(5) Spline of tooth seat worn.
(1) Lengthen the gearbox 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.
3 Random
shift.
(1) Shift lever fork is worn.
(2) Gearbox guide plate is severely worn.
(3) The fork slot of the fork and meshing bush
is 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 fork and meshing bush.
(4) Replace the interlocking pin and shift
fork shaft.
5. Noise or
knocking
sound in the
gearbox.
(1) The gear
wear is severe, the tooth surface is
peeled or the wheel tooth is broken
.
(2) Bearing is worn or damaged.
(3) Lube oil is not efficient, or the quality is
not in compliance with the requirements.
(1) Replace gear.
(2) Replace bearing.
(3) Fill or replace lube oil.
2.16.1.3 Rear Axle and Brake Faults and Troubleshooting
2 Rear Axle and Brake Faults and Troubleshooting
Fault Fault reasons Troubleshooting
1. An increase
in noise in the
central drive.
(1) The bearing play of the small
conical
gear is too large.
(2) Gear engagement is abnormal.
(3) Bearing of
conical gear pair or the actual
gear is damaged.
(4) Differential gear shaft is worn or stuck.
(5) Planetary gear or gasket is worn.
(6) Differential gear broken or damaged.
(1) Adjust according to requirements.
(2) Readjust according to requirements.
(3) Replace bearing or gear.
(4) Replace the differential gear shaft.
(5) Replace the planetary gear or shims.
(6) Replace the differential bearing.