DIFFERENTIAL BEARINGS

DRIVE AXLE

are on each side of the pinion shaft

through the filler port until it comes out the level port.

bearing carrier in the powershift

Operate the truck a few minutes. Add more oil, if

models. Be sure the pinion bearings

necessary.

are preloaded.

CAUTION:

1. Secure the axle assembly to the transmission

Be sure to re-check the oil level after

using the original gaskets. While the mounting nuts are

a few minutes of operation, since

being tightened, work the ring gear to make sure that

some of the oil will flow into the

backlash is present.

reduction gears.

CAUTION:

Damage to the ring gear or pinion

ADJUSTMENTS

may result if the two are drawn

together

during

the

mounting

A. PINION SHAFT BEARINGS

procedure.

1. The preload of the pinion shaft bearings in the

NOTE:

powershift transmission is not adjustable. If a slight

The ring may be worked back and

preload is not indicated, replace the bearing assembly.

forth with a screw driver inserted in

the filler, check or drain holes.

B. DIFFERENTIAL BEARINGS

2. Mount a dial indicator on the axle housing with

1. Secure one axle housing to the differential case

the indicator finger inserted into the filler hole and

with a .010 inch gasket between the flanges.

against a tooth on the ring gear. (Fig. 17) The tooth

and the finger should form an angle as close to 90 as

possible.

2. Set the other housing in place and draw the nuts

down until the tapered bearings Just seat in the bearing

cups. At this point there should be no differential

assembly end play nor any preload on the bearings.

3. Make sure the flange surfaces are parallel.

Measure the distances between the flanges with a feeler

gauge. This thickness, less the required preload, will

give the proper number of gaskets or shims necessary

for the axle flanges.

NOTE: The recommended bearing

preload is .005 to .008 inch.

4. Check ring gear for runout. If runout exceeds

.008 inch, remove differential and check for cause.

C. RING GEAR AND PINION

Figure 17.

NOTE:

Correct pinion depth and correct

3. Check the backlash between the ring gear and

backlash between the ring gear and

pinion by working the ring gear back and forth and

pinion are necessary to obtain

noting the indicator reading.

proper tooth contact. The pinion

depth is shim-adjusted. The shims

B-125