Specifications

49
Assembly and Installation
MAINTENANCE MANUAL
4. Measure the outer diameter of the washer
under the drive pinion. Divide the outer diam-
eter of the washer by two (2) to get the ra-
dius of the washer. Multiply the radius of the
washer by the reading on the spring scale to
get the preload on the pinion bearings
Example
Outer diameter of the washer = 3.00 inches
(76.20 mm) scale reading = 9 lbs (4 kg)
5. The preload of the drive pinion bearings must
be within the following limits.
• Fornewpinionbearings:5-45lb-in(0.56-5.08
N.m) rotational torque
• For used pinion bearings:10-30 lb-in (1.13-
3.39 Nm) rotational torque
• Ifthepreloadisnotwithinthespeciedlim-
its, remove and replace the spacer between
the outer bearing cone and the helical driven
gear. See the procedure below.
• To decrease the preload, install a thicker
spacer.
• Toincreasethepreload,installathinnerspacer.
Spacer Replacement
NOTE:
Do not grind spacers by hand. The surfaces
must be parallel within 0.0001-inch (0.0020
mm). You must use the correct spacers.
1. Prevent the drive pinion assembly from ro-
tatingbyusing axturetoholdthe teethof
the helical driven gear or place wood blocks
between the head of the pinion and the differ-
ential wall. Remove the nut and the washer
from the shaft of the drive pinion. Figure 5.18.
2. . Place the differential case into a press so
that the threaded end of the pinion is toward
the TOP of the press. Place supports under
theangeofthedifferentialcasesothatthe
differential is level. Place a wood block under
the head of the pinion. Verify that the wood
block does not touch the head of the drive
pinion.
3. Press the drive pinion out of the bearing
cone. Remove the outer bearing cone from
the differential caser.
4. Install the correct size spacer in the shaft of
the pinion over the helical driven gear.
5. Repeat Step 20 through Step 23 under Drive
Pinion Bearing Preload in this section.
6.When the preload is within the specied
range, install the main differential case and
ring gear assembly into the differential case.
See to procedure in this section.
Assembly Main Differential and Ring
Gear
CAUTION
HEAT THE RING GEAR BEFORE SEATING IT
IN THE DIFFERENTIAL CASE. DO NOT PRESS
A COLD RING GEAR ON THE FLANGE CASE
HALF. A COLD RING GEAR WILL DAMAGE
THE CASE HALF BECAUSE OF THE TIGHT
FIT.
Figure 5.18
OUTER BEARING
CONE
DRIVE
PINION
SPACER
SUPPORT
SUPPORT
WOOD BLOCK
DOES NOT
TOUCH DRIVE
PINION
(mm) Pol.
Outer diameter of the washer (76,20) 3,00
Divide the outer diameter by
two (2) to get the radius of
the washer
(38.10) 1,50
Multiply the radius of the
washer by the spring scale
reading
1,49 N.m
13,50
lb-in