Spicer Single Drive Axles Service Manual: 34DS, 34RS, 38DS, 38RS, DS340, RS340, DS380, RS380, DS400, RS400, DS3 - Manual (Page 29)

Adjustments
26
Ser
vice Procedure
3. Apply press load (see chart below) 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 from 10-20 in. lbs.. This
specification is translated into spring scale readings in the chart below.
4. If necessary, Adjust Pinion Bearing Preload by changing the pinion bearing spacer. A thicker spacer will decrease preload. A
thinner spacer will increase preload.
Once correct bearing preload has been established, note the spacer size used. Select a spacer
0.001” 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. The trial
build-up will result in proper pinion bearing preload in three of four cases.
Do not assume that all assemblies will retain proper preload once bearings are pressed on pinion
shank. Final preload test must be made in every case.
Specifications for Pinion Bearing Trial Build-up Preload Test (“Press-fit” Outer Pinion Bearings)
Nominal Bearing Spacer
Thickness Press
Loads Spring Scale Reading (without pinion
seal) (for 10-20 in. lbs. torque) (1.1-
2.3 N.m)
Axle Models in. mm Tons Metric Tons lbs. Kgs.
Forward Axles
D340, 380(P),
400-P 0.638 16.21 13.5 - 15.5 122- 140 3-7 2-3
D341, 381, (P),
401-P, 402(P),
403(P), 451-P 0.496 12.60 17 - 19 154 - 172 3-7 1.4-
32
Rear Axles 0.638 16.21 14 - 15 127 - 136 4-8 18-
36
IMPORTANT