Spicer Single Drive Axles Service Manual: Single Reduction & Single Reduction with Differential Lock - Manual (Page 21)

18
Pinion Assembly
Ser
vice Procedure
Adjust Pinion Bearing Preload - (Trial Buildup)
1. Assemble pinion bearing cage, bearings, spacer and
spacer washer (without drive pinion or oil seal). Cen-
ter bearing spacer between two bearing cones.
Lubricate bearing cups and cones.
Note: When new gear set or pinion bearings are used, select
nominal size spacer from the specification chart below.
If original parts are used, use spacer removed during
disassembly.
2. With the bearings well lubricated, place the assembly
in the press. Position sleeve so load is applied
directly to the back-face of the outer bearing cone.
3. Rotate pinion cage while applying press load to the
assembly and check rolling torque. Wrap soft wire
around the bearing cage, attach spring scale and
pull. Preload is correct when torque required to
rotate the pinion bearing cage is within the specifica-
tions listed in the chart below.
Read only the torque value after the bearing cage starts to
rotate.
4. If necessary, adjust pinion bearing preload by chang-
ing the pinion bearing spacer. A thicker spacer will
decrease preload. A thinner spacer will increase pre-
load.
Note: Once correct bearing preload has been established,
note the spacer size used. Select a spacer .001" larger
for use in the final pinion bearing cage assembly. The
larger spacer compensates for slight “growth” in the
bearings which occurs when they are pressed on the
pinion shank.
Do not assume that all assemblies will retain proper pre-
load once bearings are pressed on pinion shank. FINAL
PRELOAD TEST MUST BE MADE IN EVERY CASE.
Bearing
Cup
Washer
Cage
Cup
Cone
3
1
2
1 - Press ram
2 - Sleeve must apply pressure to
back face of outer bearing cone
3 - Spring scale
CAUTION
CAUTION