53
Should the need arise to dismantle the ball support out of the front axle case,
then use the puller bolts available in the large tool bag. For this purpose fit them
into threaded holes of the ball support flange and when screwing them in iniformly
disengage the ball support’s tail from the half-axle casing.
Check regularly the tightness of the bolts fastening the final drive to the axle
case. Bolts slackening may result in case bending.
When adjusting the final drive, adjust the taper bearing preload and check
the contact pattern in the final drive bevel gearing. For adjustment remove the final
drive from the truck. Check the preload by the torque required for cranking the
shaft. Determine resistance torque by means of a dynamometer.
Measure the torque smoothly rotating the shaft in one sense after at least five
full revolutions. Remember, maladjustment of bearings may cause damage not only of
the bearings, but also of the final drive gears.
When adjusting the final drive, proceed as follows:
1. Fit the final drive in the fixture, remove the differential and flanges.
Unscrew the bolts fastening the body of the driving bevel gear bearing. Take out the
driving gear shaft together with bearing body and gear.
Clamp the driving gear in the vice by its gear rim. Unscrew the bolts fastening
the cover and remove the latter. Unlock the lock nut and unscrew it. Remove the
lock washers. Tighten up the nut with a torque 450-500 N m (45-50 kgf m).
Fit the indicator and measure clearance in the bearings. Do not readjust the
bearings in body, if no clearance is sensed after tightening up the nut.
Estimate thickness reduction of adjusting washer 24 (see Fig. 39) (runout value
plus 0.03-0.05 mm preload). Unscrew the nut, remove the bearing and adjusting
washer. Grind or select the washer to meet the required size, fit the washer and
reassemble the bearing unit of the driving bevel gear. Torque for tightening the nuts
is 450-500 N m (45-50 kgf m). Lock the lock nut by bending out one washer edge.
Torque required for cranking the driving bevel gear in the bearings should be
0.6-1.4 N.m (0.06-0.14 kgf.m). Force on the dynamometer, when uncoiling the cord
from the body surface, is 7.5-17.5 N (0.75-1.75 kgf) (Fig .43).
2. Adjust preload of the driving spur gear bearings. Adjust the bearings by
selecting a pack of shims 8 (see Fig.39) to be placed under cap 9 of body 5. The
torque required for cranking through the intermediate shaft should be within
0.9-1.5 N m (0.09-0.15 kgf m).
Fig. 42. Constant Velocity Joint:
1-fork; 2-knuckle; 3-disc; 4-inner
half
-
axle