Lada Niva 4x4, Service Manual

Page: 38 / 81

Differential housing bearings preload and adjustment of
the side gap in final drive gears mesh
These operations are carried out simultaneously using tool
A.95688/R and key A.55085.
Fix the tool on the reduction gear casing (see fig. 3-77) with
screws 1 and 6, having screwed them in the bolt apertures for the
adjusting nut lock plate.
Move bracket 7 along the tool guide rail until arm 5 will touch
the outer side surface of the cover and tighten screw 8.
Loosen screws 1 and 3 (fig. 3-78) and place bracket 4 so that
the leg of indicator 2 will be based on the side surface of the dri-
ving gear tooth near the tooth edge, then tighten screws 1 and 3.
Turn the adjusting nuts and make the preliminary adjustment
of the side gap between the teeth of the driving and driven gears
within the limits of 0.08 - 0.13 mm. The gap is check by indicator
2 while rocking gear 6. Bearings should have no preload. The
adjusting nuts should be only in contact with bearings, otherwise
the accuracy of preload measurement is affected.
Evenly tighten both adjusting nuts of the bearings, the differ-
ential bearings covers will go apart and, hence, distance "D" (fig.
3-79) will increase by 0.14 - 0.18 mm.
Having established the exact preload of the differential hous-
ing bearings, finally check the side gap in the final drive gears
mesh, which should not change.
If the gears mesh gap is more than 0.08 - 0.13 mm, move the
driven gear closer to the driving gear or move it away, if the gap
is below this value. To maintain the bearings preload, move the
driven gear, tightening one of the bearing adjusting nuts and
loosen the other one by the same angle.
To fulfill this procedure correctly, watch the indicator 9 (see
fig. 3-77), which shows the size of the previously set bearing pre-
load. After tightening one of the nuts the indication will change, as
distance "D" (fig. 3-79) between the covers and the bearings pre-
load increase. Therefore, the other nut should be loosened until
the indicator arrow will return to the initial position.
93
Fig. 3-73. Final drive gears:
1 - driven gear; 2 - serial number; 3 - allowance in hundredth of mm to nominal;
4 - drive gear
Fig. 3-74. Fitting the rear bearing inner ring on the drive gear:
1 - roller bearing ring; 2 - tool A.70152; 3 - shim; 4 - drive gear
Fig. 3-75. Dynamometer 022.7812.9501:
1 - movable indicator; 2 - torque limit indicator; 3 - body; 4 - handle; 5 - rod with
sleeve adapter
Fig. 3-76. Checking the drive gear bearing preload:
1 - dynamometer 02.7812.9501; 2 - casing; 3 - sleeve