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REAR AXLE
3-13
holding Tool C-3281 and tighten the nut to 240 foot-
pounds torque. Turn the tool several revolutions to
permit the bearing rollers to seat. After the bearing
rollers have been properly seated measure the bearing
preload by rotating the tool with an inch-pound
torque wrench. With the bearing lubricated with Mul-
tipurpose Gear Lubricant, the correct preload specifi-
cations are from 45 to 50 inch-pounds torque.
If the bearing adjustment does not conform to
specifications it will be necessary to change the ad-
justment by either a thicker or thinner pinion bear-
ing spacer. If the preload is too great
it
will be neces-
sary to install a thicker spacer and if the preload is
not sufficient a thinner spacer will be necessary.
When the correct spacer is selected for the drive
pinion bearing, disassemble the tool from the differ-
ential carrier housing and install the bearings, pinion
positioning spacer and bearing spacer to the pinion
and install the assembly in the housing. Measure the
turning torque, it should be 20 to 30 inch pounds
before installing the seal. I f not within specifications,
correct as necessary.
Carrier Assembly
With the shaft end of pinion facing up, install the
selected washer on the pinion stem, with the cham-
fered side of the washer facing the drive pinion gear.
Position the rear bearing on the pinion shaft. Make
sure the contacting surfaces of the washer, pinion
gear and rear bearing are perfectly clean and free
from dirt or foreign particles. Install the rear bearing
cone onto the pinion shaft with Tool DD-955. Install
the selected shim pack. Lubricate the front and rear
bearing. Insert the pinion and bearing assembly in
the carrier. Apply a light coat of sealer in the carrier
bore at the seal area. Install a new seal with Tool
C-3656 until the driver bottoms on the pinion front
bearing. Install and support the pinion gear assembly
in the carrier, and install the universal joint flange
with installing Tool C-496 or DD-999. Install the plain
washer (concave side of washer down) and nut. Tight-
en the flange nut to 240 foot-pounds torque and re-
move the flange holding tool.
Differential Bearing Preload-Without
Using
Depth of Mesh
Tool C-758
If the differential assembly was satisfactorily quiet
before being disassembled, the drive pinion may
be
assembled with the original adjusting washers and
shims.
If replacement parts are installed, or differen-
tial adjustment
i s
necessary, the proper thickness
washer must be installed between the pinion and
rear bearing. The drive gear and pinion are manu-
factured and lapped in matching sets. The adjust-
ment position in which the best tooth contact is
obtained
is
etched on the end of the pinion shaft.
To obtain the proper pinion setting in relation to
the drive gear, the correct thickness thrust washer
must be selected before the drive pinion is installed
in the carrier. The pinion bearing adjusting washers
are available from .084 inch to .lo0 inch in .002 inch
steps. To select the proper thickness thrust washer,
proceed as follows: It will be noted that the face of
the drive pinion is etched with a plus
(+)
or minus
(-)
sign, followed by a number ranging from 1 to
4,
or zero (0) marking.
Depth of Mesh
(1)
If the old and new pinions have the same mark-
ing, use the spacing washer of the same thickness as
that of the old washer.
(2) If, for example, the pinion being replaced is
marked zero (0), and the new pinion is marked plus
two
+
(2), try a .002 inch thinner washer, and if
marked minus two (-2) try a
.002
inch thicker wash-
er. Due to the fact that these washers are selected
more or less by guess, it may be necessary to change
the washer several times in order to obtain the cor-
rect tooth contact pattern (See Paragraph "Gear
Tooth Contact Pattern").
Pinion Bearing Preload
(1) With the spacer and the rear bearing installed
on the pinion, place the tubular spacer and shims on
the pinion and hold the assembly in the carrier.
(2) Install the front bearing and companion flange
(without oil seal), using Tool C-496 or DD-999.
(3) Install the washer and nut and tighten to 240
foot-pounds while permitting the assembly to rotate
and to prevent damaging the bearings.
(4)
Measure the preload (See Paragraph "Differen-
tial Bearing Preload-Pinion with Bearing Spacer").
KP
20
Fig.
33-Adjusting
Differential Bearings
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