Possible Failures In The Electronic Control System For Rear Axle Differential Lock; Rear Power Take Off Shaft And Instructions For Their Troubleshooting - Belarus 922.6 Operator's Manual

6.3 Possible failures in the electronic control system for rear axle differential lock,

front driving axle drive and front power take off shaft and instructions for their trouble-
shooting
The list of possible failures in the electronic system for rear axle DL and RPTO and in-
structions for their troubleshooting are shown in Table 6.3.1.
Table 6.3.1 - The list of possible failures in the electronic system for rear axle DL and
RPTO and instructions for their troubleshooting
Failure,
external manifestation, cause
Rear axle DL cannot be engaged in the forced mode, RPTO drive cannot be engaged
Power supply voltage is not trans-
ferred to the respective electro hy-
draulic distribution valve solenoid
Absence of oil pressure the respec-
tive electro hydraulic distribution
valve outlet
Rear axle DL can not be engaged in an automated mode when guide wheels are in the
Electric circuit breakage to drive
wheels rotation angle sensor
Drive wheels rotation angle sensor
is not adjusted properly
Faulty rotation angle sensor
When the DL or PTO switch is set in the off position, the corresponding distribution
The respective electro hydraulic dis-
tribution valve spool in stuck in IN-
position
1 – clamp; 2 – FDA beam; 3 – pipe; 4 – left wheel-hub drive; 5 – harness; 6 – cup; 7 –
drive wheels rotation angle sensor; 8 – adjusting gasket; 9 – kingpin.
Figure 6.3.1 – Installation and adjustment of the drive wheels rotation angle sensor
To facilitate the task and troubleshooting of the rear axle DL and RPTO electronic con-
trol system use the electric circuit diagram for rear axle DL and RPTO electronic control system,
attached to this BELARUS-922,6 manual (Annex B).
- Check according to the electric circuit diagram if the
power supply voltage is transferred to the respective
distribution valve solenoid;
- check the solenoid winding (the winding resistance
shall be within 4-6 О)
Check if there is pressure at the respective electro
hydraulic distribution valve outlet. Eliminate the fail-
ure in the hydraulic system
forward motion position
Check electric circuits according to the electric con-
nections diagram
Check the sensor activation:
- If the wheels are in the forward motion position the
contacts of sensor 7 (Figure 6.3.1) shall be closed;
- if the driving wheels turn at an angle of more then
(13±2)°, the sensor contacts shall open. If necessary,
adjust the sensor activation using adjusting gaskets
8.
The increased number of gaskets 8 leads to the re-
duction of sensor operating angle 7, the decreased
number of gaskets leads to the increase of sensor
operating angle.
Replace the faulty sensor
valve does not engage (the channel remains open)
bution valve in diesel fuel
Troubleshooting
Disassemble and rinse the electro hydraulic distri-
170
922.6-0000010 OM