Tools Required
• | J 21777-86 Side Bearing Disc, 9.5 inch
axle, 2 Required |
• | J 34925 Pinion Setting Gage and
Components |
Important: Make sure all of the tools, the differential
side bearing bores, and the pinion bearing cups are clean before proceeding.
- Lubricate the pinion bearings with axle lubricant. Refer to
Fluid and Lubricant Recommendations
in Maintenance and Lubrication.
- Install the pinion bearings into the axle housing.
- Assemble the following components into the axle housing:
• | For the 8.6 in axle, assemble the J 21777-35 (1), the J
21777-43 (2), the J 21777-42 (3), and the J 21777-29 (4) as shown. |
• | For the 9.5 in axle, assemble the J 21777-8 (1), the J 21777-43 (2),
the J 21777-42 (3), and the J 21777-85 (4) as shown. |
Notice: Refer to Fastener Notice in the Preface section.
- While holding the J 21777-43 stationary, install an inch-pound torque
wrench on the nut of the J 21777-43 and tighten the nut until a rotating torque of
1.7 N·m (15 lb in) is obtained.
- Rotate the assembly several times in both directions in order to seat
the pinion bearings.
- Check the rotating torque of the assembly. If the torque is less than
1.7 N·m (15 lb in), tighten the nut on the J 21777-43
until a rotating torque of 1.7-2.3 N·m (15-20 lb in)
is obtained.
- Assemble the following components into the differential
carrier bore of the axle housing:
• | For the 8.6 in axle, assemble the J 21777-45 (1, 2)
to the J 21777-1 (3) as shown. |
• | For the 9.5 in axle, assemble the J 21777-86 (1, 2)
to the J 21777-1 (3) as shown. |
- Install the bearing caps.
Notice: Refer to Fastener Notice in the Preface section.
- Install the bearing cap bolts.
Tighten
Tighten the bearing cap bolts to 75 N·m
(55 lb ft).
- Rotate the J 21777-1 within the J 21777-45, 8.6 inch
axle, or the J 21777-86
, 9.5 inch axle.
The J 21777-1 must rotate back and forth freely within the discs. If the J 21777-1
does not rotate freely, disassemble the components, inspect for proper seating and/or
mis-aligned components and re-assemble.
- Align the plunger of the J 21777-1 (1)
to the 8.5 inch gage block setting of the J 21777-29, 8.6 inch
axle, or the J 21777-85
, 9.5 inch axle (2).
- Install the J 8001
to the J 21777-1
as follows:
12.1. | Loosely clamp the J 8001
onto the
stem on the J 21777-1. |
12.2. | Place the contact pad of the J 8001
onto the mounting post of the J 21777-1. |
12.3. | With the contact pad of the J 8001
touching the mounting post of the J 21777-1, loosen the lock nut on the J 8001
and push down on the J 8001
until the needle the J 8001
has turned 3/4
of a turn clockwise. |
12.4. | Tighten the clamp on the J 8001
finger tight. |
- Move the plunger of the J 21777-1 back and forth until the needle
of the J 8001
indicates the greatest deflection.
The deflection is the point where the needle changes direction.
- At the greatest point of deflection, move the housing
of the J 8001
until the needle indicates zero.
- Move the plunger of the J 21777-1 back and forth again to verify
the zero setting. Adjust the housing of the J 8001
as necessary to set the needle to zero.
- Rotate the plunger of the J 21777-1 away from the J 21777-29,
8.6 inch axle, or the J 21777-85
, 9.5 inch
axle, until it no longer touches the J 21777-29 or the J 21777-85
.
- The value indicated on the J 8001
is the thickness of the shim needed in order to set the depth of the pinion.
- Select the shim that indicates the proper thickness. Measure the shim
with a micrometer in order to verify that the thickness is correct.
- Remove the pinion depth setting tools.
- Remove the pinion bearings.
- Install the pinion shim between the pinion gear and the inner pinion bearing.
Refer to
Drive Pinion Bearings Replacement
.