Spicer Tandem Drive Axles Service Manual J340-S, J380-S, J400-S, W460-S - Manual (Page 22)

PINION POSITION
in thousandths of an inch (.001) to be added or
subtracted from the nominal dimension for the best
running position for that particular gear set.
EXAMPLE:
If pinion is etched +3, the required mounting distance is
more than nominal by .003 in. (.076 mm). This means
the pinion would require .003 in. (.076 mm) thicker shim
between pinion bearing cage assembly and carrier
housing that a pinion etched with "0". If the pinion is
marked -3, the shim required between pinion gearing
cage assembly and carrier housing would be .003 in
(.076 mm) thinner than if pinion was etched "0".
5 . Pinion shims are available in the following thicknesses.
Inches MM
.005 .127
.010 .254
.030 .762
6. Position shims on carrier housing so oil return holes
align properly. Use a minimum of three shims in a
pack. If the pack is made of different shim thick-
nesses, install the thinnest shims on both sides of the
pack for maximum sealing.
NOTE: Be sure mounting surfaces and shims are free of dirt
20
PINION SETTING
and nicks prior to assembly or leaks will occur and pinion
position can be affected.
7. Install pinion and pinion cage assembly into carrier.
NOTE: Studs can be used to assist in alignment.
8 . Tighten pinion cage to carrier bolts. (See Torque
Specifications Chart, Pgs. 33-34)
9 . An alternative to using the pinion setting gauges is to
follow the procedure described in the following section.
Pinion Position Complete
When a new gear set is being installed, use a micrometer to
measure the thickness of the old pinion position shims.
Measure each shim separately and add together to get the
total thickness of the original build-up.
Pinion
Pinion Positon Shims
Nominal Mounting Distance
Ring Gear
NOTE: If old shims are bent or mutilated they should be
replaced.
If a new gear set is being used, notice the (+), (–) or "0"
etching on both the old and the new pinions, and adjust the
thickness of the shims to compensate for the difference of
these two figures (as shown in table on next page).
For example, if the old pinion is etched +2, and the new pinion
is –2, subtract .004 in. from the thickness of the original shims
used to position the pinion.
If either or both the pinions are etched beyond the values on
this chart, follow the same procedure to establish correct
pinion position.
For example if the old pinion is etched –12 and the new pinion
is etched +9, add .021 in. to the thickness of the original
shims.
After determining the new total build up of pinion position
shims, round the figure off to the nearest multiple of .005 inch.
Use the Pinion Setting Chart on the next page as a guideline to
set the pinion.