Nortrac XT25 - Page 43

Operation Description
37
Fault Fault reasons Troubleshooting
2. Small conical
gear and
differential
bearing is hot.
（1）The pre-tightening force is too much.
（2）Lubrication is poor.
（3）The backlash at gear pair side of
conical gear is too small.
（1）Readjust the bearing pre-tightening
force.
（2）Check the oil level, add if necessary.
（3）Readjust the backlash.
3. Abnormal
noises from the
final drive.
(1) Bearing, gear or shaft damage. (2) Replace bearing, gear or shaft.
4. No braking
control.
(1) Free stroke of the brake pedal is too
large.
(2) Friction lining is worn severely or
unevenly.
(3) The free stroke of the pedal is too large.
(1) Readjust the free stroke of the pedal.
(2) Replace the friction lining.
(3) Adjust the free stroke of pedal according
to requirements.
5 Brakes gets
hot.
(1) Brake friction disk does not return.
(2) Friction plate and brake hub don’t
disengage completely.
(1) Replace the return spring.
(2) Adjust according to the requirements.
6. The tractor
pulls in one
direction when
braking.
(1) The travel of the left and right brake
pedals are not consistant.
(2) Brake friction lining on one side is
damaged.
(3) Pressure in two rear tires is uneven.
(1) Adjust.
(2) Replace friction lining.
(3) Check and fill tires with air according to
requirement.
2.16.1.4 Four-Wheel Drive System Faults and Troubleshooting
2-7 Four –Wheel Drive System Faults and Troubleshooting
Sequence
No.
Fault Fault Reasons Troubleshooting
1.
Front wheel tire
has excessive
wear.
(1) Front wheel rim or the spoke is
severely deformed.
(2) Toe-in of the front wheel is abnormal.
(3) Steering knuckle and two pin shafts of
the oil tank are worn.
(4) Tire pressure is not adequate.
(5) Front axle does not release before
transportation.
(6) Drive tire thread mounted backwards.
(1) Calibrate front wheel rim or
spoke.
(2) Adjust the toe-in.
(3) Replace axis pin.
(4) Fill tire with air according to
requirement.
(5) Disconnect the front drive
axle.
(6) Refit the wheel according to
the requirements.
2
Front wheel
shakes.
(1) Set nuts or bolts for the ball pin, oil
cylinder and the steering arm are
loose.
(2) Toe-in of the front wheel is abnormal.
(3) Bearing gap too large or severely
worn.
(4) Knuckle pin is severely worn.
(5) Front wheel rim is deformed.
(1) Check and tighten.
(2) Adjust the toe-in.
(3) Adjust or replace the
bearing.
(4) Replace the knuckle pin.
(5) Replace the front wheel rim.
3
Loud noise
(four-wheel drive
tractors).
(1) Engagement trace of the front central
drive gear is abnormal.
(2) Clearance between the central drive
bearing is too large or destroyed.
(3) Differential axle is worn or damaged.
(4) Planetary gear or gasket is worn.
(5) Final meshing of planeatry gear pair is
faulty.
(1) Readjust the meshing
lash.
(2) Adjust or replace.
(3) Replace the differential gear
shaft.
(4) Replace the planetary gear
or shims.
(5) Replace the planetary drive
gear.