82.3-0000010 OM
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6.3 Possible failures in the electronic control system for rear axle differential lock,
front driving axle drive, rear power take off shaft and instructions for troubleshooting
The list of possible failures in the ECS for rear axle DL, FDA drive, RPTO and instruc-
tions for troubleshooting are shown in Table 6.3.1.
Table 6.3.1
Failure,
external manifestation, cause
Troubleshooting
The FDA or rear axle DL drive fails to turn on in forced mode, the rear PTO drive
fails to turn on
Voltage is not supplied to the corre-
sponding distributor solenoid
Check voltage supply to the corresponding solenoid
according to the wiring diagram
Jammed spool of the corresponding
distributor
The drives (FDA, rear axle DL, rear PTO) fail to turn on
No pressure in the transmission hy-
draulic system
Troubleshoot the transmission hydraulic system
There is no power supply to the
Transmission Electronic Control
System
- check the serviceability of the corresponding fuse;
- check the serviceability of the electrical circuit ac-
cording to the wiring diagram
As the PTO drive has been turned on, the control lamp is on, but the shaft end
doesn’t rotate
Make sure that the spool moves in
the distributor when turning the PTO
on and off
Press the distributor spool. Further, if the spool in the
distributor moves when the PTO is turned on and off,
then the distributor is in good order. When the PTO is
engaged, the shaft end must rotate
The rear axle DL fails to turn on in automatic mode when the steering wheels are
in the straight position
The electrical circuit to the steering
wheel angle sensor is open
Check the electrical circuits according to the wiring
diagram
Steering wheel angle sensor is in-
correctly adjusted
Adjust the sensor - adjust the working gap between
the face of steering wheel angle sensor 7 (figure
6.3.1) and the protrusion at the end of pivot axle 9
with the required number of shims 8 so that when the
axle is turned relative to the middle position in both
directions by an angle of (13±2)°, sensor 7 is trig-
gered. An increase in the number of spacers leads to
a decrease in the angle of the sensor's response,
and a decrease - to an increase.
As you brake the tractor (press both brake pedals at the same time), the FDA
drive fails to not turn on or the rear axle DL fails to turn off (when either of the brake
One or both sensors VK 12-21 for
brake activation (response of the
brake pedals) are faulty
Simulate the response of the sensors one by one
closing the contacts in the blocks of the wire harness
going to the sensors, replace the faulty sensor
Wire harness connected to sensors
VK 12-21 is faulty
Check the harness for serviceability according to the
wiring diagram
Relay in the circuit for turning on the
FDA drive and turning off the rear
axle DL during braking is faulty
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