Belarus 892 - Possible Failures of Front Driving Axle

892-0000010B OM
294
7.8 Possible failures of front driving axle
List of possible failures of front driven axle and guidelines for troubleshooting are
shown in Table 7.8.1.
Table 7.8.1
Defect, external manifestation, cause Troubleshootin
g
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
A
djust clutch for drive torque transfer of
50…70 kgs m (500…700 Nm) by tightening
flan
g
e 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 sp
r
ings
Control rod of transfer gearbox has exces-
sive len
g
th
A
djust 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 recommended
rates.
To prevent failures maintain air pressure in
front and rear wheel tires according to the
recommended rates.
The toe-in ad
j
ustment is disturbed
A
d
j
ust 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;
- ad
j
ust 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.