952.5-0000010 OM
173
Table 6.1 continued
Malfunction, external manifestation Troubleshooting
On tractors with hydraulic lift rear PTO doesn’t transmit full torque or keeps on
rotating after switching off
Failure of control adjustment due to signifi-
cant wear of friction facing of brake band or
for other reason.
Make necessary adjustments of PTO con-
trol mechanism
Fail of hydraulic control system
Address skilled specialist.
Front driving axle
The front driving axle disengages automatically at rear wheels slipping
when moving forward
Parts of freewheel clutch of transfer box are
worn out
Replace freewheel clutch
Locking grooves of external cage of freewheel
clutch become dirty with oil decomposition and
parts wear products
Remove clutch and wash clutch parts
The springs of rollers press mechanism be-
come deformed
Remove clutch and wash clutch parts
Overload clutch in intermediate bearing
doesn’t transmit necessary drive torque
Adjust clutch for drive torque transfer of
50…70 kgs m (500…700 Nm) by tightening
flange nut from the transfer box side.
Drive and driven discs of overload clutch
are worn out
Replace discs
Disc springs have lost resistance or are
broken
Replace springs
Control rod of transfer gearbox has exces-
sive length
Adjust the length of transfer gearbox rod.
High wear and flaking of front wheels’ tires
The air pressure in front and rear wheel
tires doesn’t correspond to the recom-
mended rates.
To prevent failures maintain air pressure in
front and rear wheel tires according to the
recommended rates.
The toe-in adjustment is disturbed
Adjust wheels’ toe-in
FDA is constantly engaged because of
breakdown or jamming in transfer box con-
trol.
Do the following:
- check operation of FDA forced engage-
ment, eliminate failure;
- adjust transfer box control mechanism
Increased noise and heating in the main gear zone
Play in bearings of main gear pinions
Adjust pinions’ bearings.
Wrong engagement of main gear pinions
Check and, if necessary, adjust engage-
ment by contact pattern.
Noise at maximum angle of wheels turn
Wrong mode of FDA operation. FDA oper-
ates in the forced mode.
Check the switching mode of FDA and set
switch to position ‘Switched on” or ‘Auto-
matic’.
Wrong extreme angle of wheels turn
Check and make adjustment of FDA gear
unit angle turn.
