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Re-assembly - installation of pinion in axle case
1.
Add the collapsible spacer to the pinion assembly and place
the new oil seal in the pinion housing. Place the pinion assembly in the
pinion housing and replace the pinion flange and the nyloc nut.
Figure 13 Determining pinion to crown wheel backlash using a
dial gauge
2.
Using a torque wrench, progressively collapse the spacer
starting at 6.91 kg/m (50 lb/ft). Preload begins when end float is
eliminated at approximately 11.06 kg/m (80 lb/ft).
3.
Turn the pinion to ensure that the pinion rollers are
correctly seated.
4.
Using a torque meter, check the torque required to turn the
pinion nut. This should be set at 0.150 to 0.184 kg/m (13 to 16 lb/in).
Re-assembly - determining the correct backlash, crown wheel to
pinion
1.
Replace the differential assembly complete with the
dummy bearings into the differential housing and secure the two
halves of the axle case together.
2.
If removed, refit the push rods of tool No. RT8732 as for
setting the differential end float. Slacken the right-hand side and then
screw in the left-hand push rod as before, using a torque wrench set
to 0.28 to 0.55 kg/m (2 to 4 lb/ft) maximum. This will give minimum
backlash. Screw up the gauging nut lightly to the face of the disc and
lock in position with the lock nut as before.
3.
Unscrew the left-hand side and screw in the right-hand side
until the correct backlash is obtained. This should be checked at the
pinion flange as follows:
Setting the correct backlash, pinion to crown wheel, using a dial
gauge
1.
With pinion flange horizontal, scribe a centre line on the
top end of the flange and a line 7/8 in on either side of it. (Figure 13).
This represents the overall diameter of the pinion.
2.
Set up a dial gauge indicator on a magnetic base as shown
in Figure 13.
3.
Using a screwdriver through the level/filler aperture, lock
the crown wheel by wedging it in between the pinion flange and the
bolt heads.
4.
Rock the pinion flange and read off the backlash readings.
This should measure 0.006 to 0.008 in.
5.
Screw in the left-hand side until a stop is felt, screw up
right-hand side until contact is made. Measure minimum backlash.
Unscrew left-hand rod and tighten right-hand rod at approximately
half turn intervals until the correct backlash is obtained.
Figure 14 Replacing the differential bearing using special tool and
universal handle
1.
Replacer tool
2.
Universal handle
6.
Measure the gap between the gauge nut and the disc and
record the figure. This figure represents the amount of shims, taking
in to account the bearing width variation plus the manufacturers'
preload, that must be fitted to the right-hand differential carrier
bearing. The remainder of the shims from the overall end-float, taking
in to account again any variation in bearing width, will be fitted to the
left-hand or pinion side of the differential.
Example
To give correct backlash, shims required on right-hand side equals
0.030. therefore shims on right hand side will be 0.050 minus 0.030
equals 0.020. These figures have been obtained using the dummy
bearings. Separate the axle cases, remove the differential and proceed
as follows:
Measure and compare each dummy bearing with the overall width of
the new taper bearing assembly to be fitted on each end. Ensure that
the rollers are settled by rotating before measurement. The plus
readings from the dummy bearings width are subtracted from the
selected shims. The minus readings are added to the selected shims.
Right-hand side
Dummy bearing width example 0.710
Taper bearing width example 0.715
Actual shims required 0.30 minus 0.005 = 0.025 plus 0.002 which
represents the manufacturers' preload allowance. Therefore total
shims required = 0.027.
Left-hand side
Dummy bearing width example 0.712
Taper bearing width example 0.710
Actual shims required 0.020 plus 0.002 = 0.025 plus 0.022 which
represents the manufacturers' preload allowance. Therefore total
shims required = 0.024.
Page 62
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