892-0000010B OM
101
Tapered roller bearings 10 must be adjusted with a preload. The force applied to the
outer end of the teeth of driven gear of the main drive 6 for turning the differential in the bearings
should be within the range of 30 to 50 N when measured after turning the differential by 4 ... 5
full turns. When tightening the bearings, the differential must be rotated periodically. Adjustment
is carried out in the following order:
- install two sets of adjusting shims under the flange of the right cage, then tighten the
bolts with a torque of 80 to 100 Nm;
- picking up shims under the flange of the left bearing cage 37, set the required preload
in the bearings.
The side clearance in the gear engagement of the main drive should be from 0.2 to 0.55
mm but not more than 0.25 mm per pair. The side clearance in engagement is checked with an
indicator acting on the tooth of the driven gear in at least three of its positions. The adherence
of the teeth (contact) must be at least 50% of the tooth surface. The location of the imprint should
be in its middle part or closer to the top of the cone. In case of unsatisfactory imprint, it is nec-
essary to check the installation of the drive gear and adjust its position. Adjustment of gears
should be made only after adjustment of tapered roller bearings.
ATTENTION: WORN-OUT GEARS OF THE MAIN DRIVE SHOULD BE REPLACED AS
A PAIR ONLY. REPLACEMENT OF ONE GEAR IS NOT ALLOWED!
3.4.3 Differential
The differential consists of case 5 and cover 9 (Figure 3.4.1), cross 3, four planet gear
washers 2, two axle shaft gears 40 and two support washers 39 of axle shaft gears.
The case and the cover of the differential are interconnected by eight fit bolts 11, which
are locked in pairs with a safety wire to avoid turning. The holes for the installation of the
cross are processed after assembling the case and the cover of the differential. Therefore,
marking is made on the differential case and cover by applying the same serial number.
When assembling the differential, it is necessary to align these numbers on the mating parts.
The teeth of planet gears 4 are in constant engagement with both axle shaft gears 40.
The axle shaft gears are connected the drive gears of the final drives 1 and 12 with their
splines. Washers 39 made of hard tin bronze are installed under the faces of the axle shaft
gears. To avoid turning, these washers are fixed in the differential housing and cover by
means of their projections.
3.4.4 Final drives
To increase the torque and transfer rotation from the differential to the drive wheels
of the tractor, final drives are used, which are two pairs of cylindrical gears with straight teeth
and are located on the right and left sides of the rear axle.
Drive gears of final drives 1 and 12 (Figure 3.4.1) are made as one piece with splined
shafts and are mounted on two bearings 36 in bores of cages 37. One splined end of gears
1 and 12 is connected to differential axle-shaft gears, the other one is used for the installation
of connecting disks 18 of the brakes. Under the flanges of cages 37, adjusting shims 38 with
a thickness of 0.2 and 0.5 mm are installed. These shims are used to adjust the clearance
in tapered roller bearings 10 of the differential and the lateral clearance between the teeth
of the main drive gears.
Driven gears of the final drives 13 are mounted on the splines of axle shafts 23, each
of which rotates on two ball bearings 14 and 26. Axle shafts are fixed in the axial direction
with caps 25 through bearings 26.
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