Possible Failures In The Electronic Control System For Rear Axle Differential Lock, Front Driving Axle Drive, Front Power Take Off Shaft, Gb Reduction Gear And Instructions For Their Troubleshooting - Belarus 2022.6 Operator's Manual

6.3 Possible failures in the electronic control system for rear axle differential
lock, front driving axle drive, front power take off shaft, GB reduction gear and
instructions for their troubleshooting
The list of possible failures in the electronic system for rear axle DL, FDA drive,
FPTO (if mounted), GB reduction gear and instructions for their troubleshooting are shown
in Table 6.3.1.
Table 6.3.1
Failure,
external manifestation, cause
FDA drive or rear axle DL can not be engaged in the forced mode, or GB reduction
unit can not be shifted to the higher pass, FPTO drive can not be engaged
Power supply voltage is not trans-
ferred to the respective distribution
valve solenoid
Jamming of the respective distribu-
tion valve spool
None of the drives (FDA, rear axle DL, FPTO) can be engaged and GB reduction unit
There is no pressure in the trans-
mission hydraulic system
When the front PTO drive is engaged, indicating lamp lights up but the PTO shaft end
Make sure that the cylinder pin is
moving while engagement
Check the adjustment of FPTO
brake band tightening
Rear axle DL or FDA drive can not be engaged in an automated mode when guide
Big clearance between the bracket
and the butt end of the left or right
sensors correspondingly for guide
wheels turning angle
Breakage in the supply circuit "mi-
nus" or in the circuit "signal" of left
or, correspondingly, right sensors for
turning angle
Faulty left or, correspondingly, right
sensor for turning angle
While tractor slowing down (depressing both brake pedals simultaneously), FDA
drive can not be engaged and rear axle DL can not be disengaged (depressing either
Faulty one or both brake actuation
sensors ВК 12-21 (actuation of
brake pedals)
Cable of connection to sensors ВК
12-21 is faulty
Faulty relay in FDA drive actuation
circuit and rear axle DL deactivation
circuit while slowing down
Automatic activation sensor is not
properly adjusted or out of order
Check according to the electric circuit diagram if the
power supply voltage is transferred to the respective
distribution valve solenoid
Rinse the distribution valve
can not be shifted to the high gear
Eliminate the failure in the transmission hydraulic
system
extension fails to rotate
If the cylinder rod is moving, FPTO shaft electric con-
trol is operating in a proper manner
Adjust, if necessary
wheels are in the forward motion position
Adjust the clearance within the limits 3±0.2 mm by
means of rotating nuts 6 and 7, as shown in figure
6.3.1.
Check electric circuits according to the electric con-
nections diagram
Replace the faulty sensor
of the brake pedals)
Simulate sensor actuation one-by-one by means of
contact closure in cable sockets to the sensors. Re-
place the faulty sensor
Check the cable for operability according to the elec-
tric circuit diagram
Replace the relay
FDA drive fails to operate in an automated mode
Adjust the automatic activation sensor or replace it
Troubleshooting
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2022.6-0000010 OM