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Fig. 3-69. Rear axle reduction gear components:
1 - drive gear flange; 2 - oil seal; 3 - oil deflector; 4 - front bearing; 5 - rear bearing; 6 - drive gear adjusting ring; 7 - axle shaft gear support washer; 8 - axle shaft gear;
9 - pinion; 10 - pinion shaft; 11 - driven gear; 12 - differential housing; 13 - differential housing bearing; 14 - adjusting nut; 15 - stop plate securing nut; 16 - stop plate;
17 - stop plate; 18 - driven gear fastening bolt; 19 - drive gear; 20 - cover securing bolt; 21 - spring washer; 22 - gasket; 23 - reduction gear securing bolt; 24 - reduction
gear housing; 25 - distance sleeve; 26 - flat washer; 27 - drive gear flange securing nut
fails to be achieved even by increasing the washer thickness,
renew the gears due to their excessive wear.
Fix the gear on the differential box.
Using tool A.70152 press-fit the roller bearing inner rings on
the differential box.
Drive gear - refitting and adjustment
The correct location of the drive gear against the driven gear
is provided by selecting the thickness of the adjusting ring fitted
between the driving gear face and the rear bearing inner ring.
Select the thickness of the adjusting ring with the help of tool
A.70184 and tool A.95690 with an indicator. The procedure is
carried out in the following sequence.
Fix the reduction gear casing on a bench, use tool A.70185
to press-fit the outer rings of the drive gear front bearing in the
casing, and tool A.70171 (fig. 3-70) - for the rear bearing.
On tool A.70184, simulating the driving gear, with the help of
tool A.70152, fit the rear bearing inner ring and insert the tool into
the reduction gear casing (fig. 3-71).
Fig. 3-70. Fitting the driving gear rear bearing outer ring using special
tool:
1 - tool A.70171
Fit the front bearing inner ring, the driving gear flange and,
while turning the tool to refit the bearing rollers correctly, tighten
the nut with torque to 7.85-9.8 N•m (0.8-1 kgf•m).
Fix tool A.95690 on tool face 4 and adjust the indicator with
a 0.01 mm scale to zero having established its leg on the same
end face of tool A.70184. Then move indicator 1 so that its leg
will be on the landing surface of the differential housing bearing.
Turn tool 4 with indicator left and right, and find a position in
which the arrow of the indicator will show the minimum reading of
"a
" (fig. 3-72) and record. Repeat this operation on the landing
1
surface of the second bearing and record the reading of "a
Define thickness "S" of the driving gear adjusting ring, which
is an algebraic difference between "a" and "b":
S = a - b
Where:
a - average arithmetic distance from the tool 1 face (fig. 3-64)
to the differential bearing journals
a = (a
+ a
) : 2
1
2
b - deviation of the driving gear from the nominal position in
terms of mm. The size of deviation is marked on the driving gear
(fig. 3-73) in hundredth of a millimeter with a plus or minus sign.
When finding the thickness of the adjusting ring pay attention
to the "b" sign and unit of measurement.
Example. We presume, that size "a", determined by the indi-
cator, is equal to 2.91 mm (size "a" is always positive), and on
the driving gear after the serial number the deviation of "-14" is
shown. To get size "b" in millimeters, we multiply the specified
size by 0.01 mm.
b = -14 • 0.01 = -0.14 mm
Determine the thickness of the driving gear adjusting ring in
millimeters.
S = a - b = 2.91 - (-0.14) = 2.91 + 0.14 = 3.05 mm
".
2
91
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