Belarus 1025/1025.2/1025.3 Section I. Possible malfunctions
I18
Control of DI and FDA (electrical part)
Malfunction, symptom Correction method
Rear axle DI or FDA drive are not 1. No voltage is supplied to corresponding
switched on in the forced mode. electromagnet of electric-hydraulic distributor.
Check voltage supply to electromagnet by
connections’ electric wiring (fig.1, 2).
Check electromagnet winding (winding
resistance should be 4…5 Ohm)
2. No oil pressure at distributor outlet
Check pressure at the distributor outlet.
Correct malfunction in the hydraulic
system.
Rear axle DI doesn’t switch on in the Sensor (switch BK 12-51) of drive wheels
automatic mode with drive wheels turning angle, located on the FDA left side,
position “straight” doesn’t operate.
Check serviceability of circuit to the sensor
according to diagram (fig. 1, 2).
Check sensor operation:
- with position of driving wheels “straight” ,
sensor contacts should be closed;
- when driving wheels turn by an angle
over (13+/-2) degrees, sensor contacts
should open.
If necessary, adjust sensor operation with
adjusting spacers 50-1702048.
FDA drive doesn’t switch on Sensor (switch BK 12-15) of FDA drive
automatically when rear wheels slip. automatic control, located under the
distributor, doesn’t operate.
Check serviceability of circuit to sensor by
diagram (fig. 1). Check sensor operation:
- with no rear wheels slippage sensor
contacts should be open;
- when rear wheels slip sensor contacts
should close.
If necessary, adjust sensor operation with
adjusting spacers 50-1702048.
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