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3-14
REAR AXLE
Installation of Differential in the Carrier
(1) Install the differential bearing cup on its re-
spective bearing, and position the assembly in the
carrier.
(2) Install the differential bearing caps, making
certain that the identification marks on the cap cor-
respond with those on the carrier. Install attaching
bolts and tighten bolts of each cap by hand.
(3) Note the identification marks on the differential
bearing adjusters and reinstall each in its respective
side.
(4) Screw the adjuster in by hand. No attempt
should be made at this time to apply any excessive
pressure. To square the bearing cups with the bear-
ing, turn the adjusters "in" with spanner wrench
Tool C-406A,'(Fig. 35) until the cups are properly
squared with the bearings and the end play elimi-
nated, with some back lash existing between the drive
gear and pinion.
(5) While facing each bearing support cap, tighten
one bolt 85 to 90 foot-pounds torque on each side.
(6) Secure dial indicator Tool C-340 or C-3339 to a
carrier flange so the pointer or indicator is squarely
contacting one of the drive gear teeth (drive side)
(Fig. 34).
Backlash
(1) Measure the backlash between the drive gear
and pinion. After the first reading is taken, move the
dial indicator away from the tooth sufficiently to ro-
tate the drive gear approximately 90 degrees and
again measure the backlash. The backlash should
be measured in four different positions to determine
the least clearance between the drive gear and pinion.
After the point of least clearance has been estab-
lished, mark the drive gear.
Do not rotate the drive
gear from the point of least clearance until
all adjust-
ments have
been
completed.
Fig. 34-Measuring
Backlash Between Drive Gear and
Pinion
DRIVE
COAST
CORRECT
ADJUSTMENT
Canter
Cantar
1 -
PINION SPACER
TOO THICK
lor.
Lor
Hael. Lon
PINION SPACER
TOO THIN
A
B
Haal. High
To. .
Hlph
-
k - 4
GEAR TOO CLOSE
TO PINION
Sllphtly Hlgher
TO.
GEAR TOO FAR
FROM PINION
Hmal
Sllghtly
Lower
1.
PINION SPACER CHANGES AFFECT THE COAST
SIDE
CONTACT
FASTER THAN THE DRIVE SIDE
2.
BACKLASH ADJUSTMENTS AFFECT THE DRIVE SIDE CONTACT
3.
ALL BACKLASH MEASUREMENTS SHOULD BE MADE AT THE
MUCH FASTER THAN THE COAST SIDE
POINT OF MINIMUM BACKLASH
NY 1022A
Fig. 35-Gear
Tooth Contact Pattern
(2) Turn both bearing adjusters equally
(in
the
same direction until the back lash between the drive
gear and the pinion is .0005 inch to .0015 inch.
This
backlash variation is given to permit alignment and
installation of the bearing adjuster lock, lock washer
and attaching bolt. The adjuster must only
be turned
in a clockwise direction and under no circumstances
should be backed
off.
(3)
Install the adjuster lock on the bearing cap on
the back-face side of the drive gear.
Preload
(1) Turn the other bearing adjuster (tooth side of
drive gear) (Fig. 34) in a notch at a time (notch re-
ferred to
is
the adjuster lock holes) until the backlash
between the drive gear and pinion is a minimum of
.006 inch to .008 inch. This will preload the bearings
and establish the correct backlash.
(2)
Tighten the remaining two bearing support cap
bolts
85
to 90 foot-pounds torque.
(3) Install the remaining adjuster lock, lockwasher
and attaching bolt. Tighten the lock retaining cap
screws 15 to 20 foot-pounds torque.
GEAR TOOTH CONTACT PATTERN
The gear tooth contact pattern (Fig. 35) will dis-
close whether the correct washer has been installed
behind the pinion rear bearing, and the drive gear
has been positioned properly.
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