GMC 1976 ZEO 6083 Maintenance Manual page 179

3C- 1 6
FINAL DRIVE
Figure 42-Checking Inner Flange Of Housing
checked any time the following parts have been re-
placed :
a. Ring gear and pinion .
b. Pinion bearings (front or rear).
c. Rear bearing retainer .
d. Final drive housing.
2 . Position pinion bearing race on pinion bearing
and install Tool J-22587-1 as shown in Figure 41 .
Using a feeler gauge check thickness between bearing
race and Tool'J-22587-1 . Loosen bolts holding Tool
Figure 43-Checking Outer Flange Of Housing
J-22587-1 so that pinion bearing shim can be in-
stalled. Shims are available in sizes from .036" to
.070" in increments of .002" . Add shims until a pre-
load of 2 to 5 in . lbs. for used bearings, 2 to 5 in. lbs.
for new bearings is obtained . RECORD FINAL
SHIM THICKNESS .
3. Remove Tool J-22587-1 .
4. With dial indicator J-8001 and extension J-
7057, attach existing dial indicator post to Tool J-
22587-2 . (figure 42) While holding contact studs
(three) of Tool J-22587-2 firmly against shoulder of
bearing housing, position dial indicator as shown in
Figure 42 and rotate dial to ZERO .
5. Carefully lift dial indicator assembly over
flange of bearing housing and position assembly as
shown in Figure 43 . With the three contact studs
held firmly against shoulder of bearing housing, read
the dial indicator deflection . RECORD THIS DE-
FLECTION .
The following is an example offinding the correct
pinion bearing pre-load with information obtained
above.
(Shims recorded in Step 2) . . . . .... .... . . .... . ...... . . . .053"
(Diff. in housing - Step 5) ..... . .... . .... . . ... . .. ... + . .024"
..... .... . . . ... . .... . .... . . ... . . .... . .... . .... . . .... ..... . . . . . . . . . . . . ... .077,
(Built in step in Tool J-22587-1) ... . . ... . .... . .. -.025"
..... ..... . . ... . .... . .... . . ... . ..... . . ... . .. . . . . .... .... . . . ... . .... .. .. . .052"
(To compensate for increase in pre-load when
installing housing) . . ..... . .... . . .... . . .... . . ..... ..... . . ... - .002"
(Actual pinion bearing pre-load shim
required) . . .... . ..... .... . . . ... . . . .... ...... . .... . . .... . . .... . ..... .050"
Figure 44-Installing Pinion Rear Bearing Outer Race