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Fig. 3-66. Undoing the drive gear nut:
1 - tool to fix the drive gear flange; 2 - box wrench; 3 - drive gear flange;
4 - bracket
- turn the differential side gears and differential pinions so
that the last ones will roll out from the differential openings, then
take them out;
- remove the differential side gears with support washers.
Inspection of reduction gear components
Before inspection carefully wash all parts. It will help to locate
wear and damages.
Check for damages on the final drive gear teeth and for prop-
er location of the bearing pattern between the teeth. In case of
inadmissible wear renew the parts; find the reason for wrong
teeth mesh.
Note. As spare parts the driving and driven gears are deliv-
ered in a complete set matched by noise and mesh, therefore
both should be replaced in case of damage.
Fig. 3-67. Removing the drive gear rear bearing inner ring using puller
A.40005/1/7:
1 - puller; 2 - drive gear; 3 - bearing ring; 4 - fixture A.45008
90
Inspect the differential pinion apertures and the shafts;
insignificant surface damages smooth with fine sandpaper, and
renew in case of serious damages.
Inspect the surfaces of the axle shaft gear journals and their
bores in the differential box, check the condition of box apertures
for differential pinion shafts. The revealed damages should be
eliminated as described above, if necessary, replace worn or
damaged parts.
Examine the surfaces of the differential side gear support
washers, even insignificant damages should be eliminated.
When replacing, match the new washers by thickness.
Examine the roller bearings on the drive gear and the differ-
ential boxes; they should have smooth working surfaces and no
wear. Replace bearings in slightest doubt in their serviceability,
as bad condition of bearings can cause noise and teeth jamming.
Check for deformations or cracks on the casing and on the
differential box, renew if necessary.
Reduction gear - reassembly
The reliable operation of the reduction gear is provided by
strict observance of following guidelines on reassembly and
adjustment.
The reduction gear components are shown on fig. 3-69.
Differential reassembly. Grease the differential side gears
with support washers and the differential pinions with transmis-
sion oil and establish them through the openings in the differen-
tial box. Turn differential pinions and differential side gears so
that to align the rotation axis with the opening axis in the box,
then insert the differential pinion shaft.
Check the axial gap in each differential side gear: it should be
0-0.10 mm, and the moment of resistance to rotation of the dif-
ferential gears should not exceed 14.7 N•m (1.5 kgf•m).
In case of an excessive gap resulting from wear of differen-
tial parts, replace the support washers of the differential side
gears by others of greater thickness. If the specified clearance
Fig. 3-68. Removing the differential housing bearing inner ring using
puller A.40005/1/6:
1 - puller; 2 - bearing inner ring; 3 - differential housing; 4 - rest A.45028
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