892-0000010B OM
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3.4.5.2 Hydraulic control of rear axle differential lock
The differential lock control consists of a lock valve, a pedal mounted on the cab floor,
oil lines and hydraulic fittings.
The differential lock is controlled from the cab by pedal 1 (Figure 3.4.3), which acts
on the lock valve located under the cab floor through the levers.
1 – differential lock control pedal; 2 - dashboard
Figure 3.4.3 Rear Axle Differential Lock Control
Lock valve 2 (Figure 3.10.1) of the differential is built into the HSC drain hydraulic line
and controls the flow of oil supplied to the lock clutch. The diagram of the lock hydraulic
control in the BELARUS-892/892.2 tractors is shown in Figure 3.10.2.
Pedal 1 (Figure 3.4.3) of differential lock control has two positions:
- "Lock off" - the uppermost position of the pedal (the pedal is not pressed);
- “Lock is forced on” - when you press the pedal all the way and hold it in this position.
It is used for short-term locking of the rear wheels when overcoming road obstacles in the
field and transport operations and when performing various work with a significant relative
slipping of the rear wheels. The position is not fixed - when the pedal is released, it returns
to its original "Off" position.
In the off position (the pedal is not pressed), oil from the steering dosing pump freely
passes through lock valve 2 (Figure 3.10.1) and drains into oil tank 3.
As you press pedal 12 (Figure 3.4.4), levers 13, 20 turn spool 34 of lock valve 1,2,
23-35, which directs the oil flow into the locking clutch under pressure of 9-13 kgf/cm2, and
the differential gets locked.
As you release the pedal, return spring 18 raises the pedal, the spool rotates to its
original position, oil from the locking clutch is drained into the oil tank of the hydraulic system
through the lock valve, and the clutch gets unlocked.
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