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Sec. 2
Page 24
GM COACH MAINTENANCE MANUAL
REAR AXLE
Figure
6-Measuring Drive
Gear Run-Out
(flanged) section of differential case (11).
3. Lay right-hand section of case on bench
with flange upward, place differential pinions (42)
and pinion thrust washers (3) on differential spider
(1), place pinion and spider assembly on side gear
(9), then install remaining side gear (9) and thrust
washer (10).
4.
Place left-hand section of differential case
on right-hand section with alignment marks posi-
tioned as shown in figure 3, then insert case bolts
(43) downward through left-hand section.
5. Install nuts (4) on bolts (43), tighten to
minimum torque (155-200 foot-pounds).
Tighten
each nut until next castellation of nut lines up
with hole in bolt, then install lock wire through
all bolts.
6.
Position drive gear
(1)
on differential case
(11) flange, then install attaching bolts (13). Tight-
Figure
7-Differential Bearing Preload
Adjustment
en bolts securely, then install lock wire (12)
through bolt heads in such a manner that lock
wire will become tighter if bolts loosen.
7.
Press differential side bearings (39) on
hubs of differential case (14) until bearing cones
seat firmly.
DIFFERENTIAL AND DRIVE GEAR
INSTALLATION (Fig. 3)
1.
Coat differential side bearing cones (39)
and cups (40) with lubricant specified in LUBRI-
CATION (SEC. 13).
2.
Place bearing cups (40) over bearing cones
(39), then position differential and gear assembly
in differential carrier (14).
3. Insert bearing adjusting rings (38) and turn
hand tight against bearing cups (39).
4.
Place differential bearing caps (41) over
studs with alignment marks in line, then tap lightly
into position.
CAUTION: If bearing caps do not seat easily
and properly, adjusting rings
may be cross-
threaded. Remove bearing caps and reposition ad-
justing rings. Forcing caps into position will re-
sult in irreparable damage to differential carrier
or to bearing caps.
5. Install washers and nuts on bearing cap
studs, tighten nuts snugly, then back nuts off until
bearing adjusting rings (38) can be turned.
6. Tighten adjusting rings (38), alternately,
until bearings (39) are seated in bearing cups (40).
Revolve differential assembly after each tightening
to keep bearing cups straight in bores.
7. After side bearings (39) are firmly seated,
tighten left-hand adjusting ring one or two notches,
then check drive gear run-out in manner shown
in figure 6. Run-out should be within limits given
in "Specifications" at end of this section.
DIFFERENTIAL BEARING PRELOAD
ADJUSTMENT
1.
Using dial indicator at back face of drive
gear (1) as shown in figure 7, loosen bearing ad-
justing ring (38), on side opposite bearing, enough
to notice end play on dial indicator.
2. Tighten the same adjusting ring until .000"
end play is obtained.
3. Tighten adjusting rings (38) one notch each
from .000 end play position to impose correct pre-
load on differential side bearings (39).
NOTE: After adjusting bearing pre-load, pro-
ceed with tooth contact and backlash adjustment
as directed in following paragraph.
GEAR TOOTH CONTACT ADJUSTMENT (Fig. 8)
Drive pinion (29) is adjusted for tooth contact
by means of shims (15) between pinion cage (23)
and differential carrier (14).
Drive gear (1) is
adjusted by means of adjusting rings (38).
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