Belarus 820 - 7.8 Possible failures of front driving axle

80-0000010B OM
358
7.8 Possible failures of front driving axle
A list of possible failures of the front driving axle and instructions for their trouble-
shooting are given in Table 7.8.1.
Table 7.8.1
Failure,
external manifestation, cause
Troubleshooting
Front axle does not engage automatically when rear wheels are slipping on
tractor forward travel
Parts of free travel clutch of trans-
fer box are worn out
Replace the free travel clutch
Jamming slots of outer sleeve of free
travel clutch are clogged with prod-
ucts of oil oxidation and part wear
Remove the clutch and rinse the clutch parts
Springs of roller clenching mecha-
nism are distorted
Remove the clutch and rinse the clutch parts
Safety clutch in intermediate sup-
port does not transmit the required
torque
Adjust the clutch for transmission of 400 to 800
Nꞏm torque by tightening the flange nut from the
side of transfer box
Driven and driving disks of safety
clutch are worn out
Replace the disks
Disc springs have lost flexibility or
have broken
Replace the springs
Transfer box control rod has an
increased length
Adjust the length of transfer box rod
Premature wear or tread and delaminating of front tyres
Noncompliance of air pressure in
front and rear tyres to the recom-
mended standards
To prevent faults, maintain the air pressure in front
and rear tyres according to the recommended
rates
Improper toe-in adjustment of
wheels
Adjust the wheels’ toe-in
FDA is constantly engaged due to
breakage or sticking in transfer box
control
Do the following:
- check the operation of FDA forced engagement,
eliminate the fault;
- adjust the control mechanism of the transfer box
Increased noise and heating in the area of the main gear
Gap in the main gear bearings Adjust preload in bearings of driving gear of master
drive
Wrong mesh of master drive
gears.
Check and, if necessary, adjust the mesh accord-
ing the contact patch