Main Drive; Differential; Rear-Axle Drive; Final Drive - Belarus 1822.3 Operator's Manual

3.5.2 Main drive

The main drive is bevel with spiral teeth, it consists of a driving bevel gear, made as
all-in-one piece together with the GB secondary shaft, and a driven gear 1 (figure 3.5.1),
secured by bolts 2 between the differential bodies 10, 11a, 12a.
The main drive backlash shall stay within 0,25 to 0,55 mm. The tooth contact shall
make not less than 50% of surface with print location in the tooth middle part or closer to
cone vertex. The backlash shall be adjusted before installing the final drives by way of re-
locating gaskets from under the cage 7 and 16 flanges without changing their total num-
ber.

3.5.3 Differential

The differential is a closed-type, taper, it consists of three bodies 10, 11a and 12a
(figure 3.5.1), joined by the bolts 2, the cross 11, four satellite gears 12 with spherical
washers. The differential body assembly is installed in the rear axle body 36 on two ta-
pered roller bearings 14. The rear axle differential is locked by electrohydraulically-
controlled dog clutch (34, 35), installed on the bushings 33 and 39 of the drive pinions 9
and 15, which locks the axle-shaft gears 3 and 13 of the differential through the shafts 6,
19.
The tapered roller bearings 14 shall be adjusted with preload. Force, applied to the
driven gear 1 tooth outer face, to turn the differential in the bearings shall make 30 to 50 N.
The adjustment shall be carried out by changing the amount of gaskets the flanges of the
cages 7 and 16.

3.5.4 Rear-axle drive

The rear-axle drive consists of two pairs of spur gears 9, 38 (figure 3.5.1) and 15,
23. The drive pinions 9, 15 are fitted on the splined shafts 6, 19, which are mounted on the
roller bearings 8 in the cages 7, 16. The splined joints of the pinion drive shafts 6, 19 con-
nect the differential side gears with the pinions of the axle shaft drive and disks of the
brakes 4, 17. The driven gears 23 and 38 are fitted on the splined bushings 33 and 39,
mounted on the roller bearings in the rear axle body 36 and the cages 41 and 44, accord-
ingly. Between the flanges of the cages 7, 16 and the rear axle body 36 adjusting shims
with a thickness of 0,2 mm and 0,5 mm are mounted, changing their amount it is possible
to adjust the axial clearance in the roller bearings 14 as well as the backlash of the main
drive gears.

3.5.5 Final drive

The final drive consists of two spur planetary drives, located in the tubes 5, 25 (fig-
ure 3.5.1) and the splined shafts 43, 40, joining the driven gears 23, 38 with the planetary
drives.
The planetary drive consists of a stationary crown wheel 32, fitted on the teeth of
the cage 44, the carrier 31, the sun gear 30, four satellite gears 20, rotating on the satellite
gear centers 22 on the roller bearings 21.
The tapered roller bearings 45 of the semi-axles 24, 42 are adjusted by matching a
set of gaskets 27 with a thickness of 0,2 mm and 0,5 mm, mounted between the semi-axle
end and the washer 26.
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