Differential Lock Mechanism; General Information; Differential Lock Mechanism Adjustment - Belarus 1822.3 Operator's Manual

3.5.7 Differential lock mechanism

3.5.7.1 General information

The electrohydraulically-controlled differential dog clutch is mounted on the splined
bushings 2 and 6 (figure 3.5.3) of the driven gears 1, 7 of final drives and consists of a half
clutch 4, secured on the bushing by a pin 3, and a shifting half-clutch 5, fitted on splines of
a bushing 6 and contolled by the electrohydraulic system.
The differential is locked by way of the half-clutch 5 shifting under the influence of
the fork 13, moved by the piston 11 as the oil is supplied under pressure to channel "A" of
the rear axle upper cover 14. The piston with the fork and Belleville springs 12 are
mounted in a bracket 8, attached to the rear axle cover. As the half-clutches are turned on
the splined bushings 2, 6 and the pinions of the planetary final drives close with each
other.
The differential is unlocked automatically under the influence of the Belleville
springs 12 as the channel "A" opens into the drain (pressure relieved).

3.5.7.2 Differential lock mechanism adjustment

The adjustments are not required during running. After carrying out repair opera-
tions adjust the clearance of 1,5 to 2,0 mm between the ends of the jaws of the half-
clutches 4 (figure 3.5.3) and 5, proceeding as follows:
-arrange the jaws of the half-clutch 4 against the jaws of the half-clutch 5 with the
bracket 8 removed;
- mount and fasten the bracket and loosen the lock screw 9;
- undoing the screw 10, bring the shifting half-clutch 5 until is stops against the jaw
end of the stationary half-clutch 4 and then do the screw in by 1...1,25 rev. to provide a
required clearance, tighten the screw 9.
1, 7 – driven gear; 2, 6 – splined bushing; 3 – pin; 4, 5 – half-clutch; 8 – bracket; 9 –
lock screw; 10 – adjusting screw; 11 – piston; 12 – spring; 13 – fork; 14 – rear axle upper
cover.
Figure 3.5.3 – Differential lock mechanism
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