MAINTENANCE MANUAL - Meritor

The preload of the bearings on the drive pinion
is controlled by a spacer between the outer
bearing cone and the helical driven gear.
Adjust the preload by changing the size of the
spacer.
• To decrease the preload, use a thicker spacer.
• To increase the preload, use a thinner spacer.
• If the depth of the drive pinion is changed,
the thickness of the spacer must also be
changed the same amount. See the following
examples.
• If a 0.003 inch (0.076 mm) shim is ADDED to
the shim pack to INCREASE the depth of the
drive pinion, a 0.003-inch (0.076 mm) larger
spacer must be installed to keep the preload
on the bearings.
• If a 0.003-inch (0.076-mm) shim is RE-
MOVED from the shim pack to DECREASE
the depth of the drive pinion, a 0.003-inch
(0.076 mm) smaller spacer must be installed
to keep the preload on the bearings.
NOTE:
The helical driven gear and the spacers are
installed when the bearing preload on the
drive pinion is inspected and adjusted.
1. If you are installing a new ring gear and drive
pinion, the correct thickness of the shim pack
between the pinion inner bearing cap and the
differential must be determined. See the procedure
in this section before temporarily assembling
and installing the drive pinion assembly.
• If you are installing the original ring gear and
drive pinion, temporarily install the drive pinion
assembly.
2. If removed, use a press and a sleeve to install
the inner bearing cone onto the drive
pinion. Place the sleeve on the inner race of
the bearing. Apply pressure until the bottom
of the cone touches the shoulder on the pinion.
Figure 5.5.
MAINTENANCE MANUAL
Assembly and Installation
3. Apply axle lubricant to the bearing caps and
cones.
4. If removed, install the shim pack and the inner
bearing cap of the drive pinion.
A. Place the differential case into a press so
that the bearings caps are toward the TOP
of the press.
B. Install the correct amount of shims into the
bore for the inner bearing cap of the drive
pinion. Figure 5.6.
Bearing caps
PRESS AND
SLEEVE
Figure 5.5
SHIMS
Figure 5.6
C. Place the cap into the bore. Figure 5.6.
D. Place supports under the differential case
so that the case is level.
E. Place a sleeve or a installation tool into the
caps and press the caps into the bore until
the bottom of the cap touches the shims.
If a press is not available, use a sleeve, a
brass drift or a installation tool and a hammer
to install the cap. Figure 5.7.
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