Section II. OVERHAUL OF DRIVE AXLE AND ADAPTER

TM 10-3930-609-35

screw-type terminals on seat switch, pump motor switch

harness with clips and clamps, assure that sufficient

clearance is maintained between harness and all

and on brake stoplight switch. Insulate other exposed

terminals with vinyl tubing.

moving parts. Hand form harness where required to

obtain clearance. Apply silicone rubber to exposed

Section II. OVERHAUL OF DRIVE AXLE AND ADAPTER

3-4. Description of Adapter and Drive Axle

i. While holding gear cluster, push out shaft; then,

The adapter provides a gear reduction between the

lift out gear cluster (with bearings and spacer) and

travel motor and pinion and the drive axle pinion

washers.

gearshaft. The gears are mounted in a gear case with

j. Remove bearings and spacer from bore in gear

flanges for mounting the travel motor and for mounting

cluster.

to the drive axle differential housing. The travel motor

drives a bearing-mounted gear cluster which in turn

3-8. Disassembly of Drive Axle (fig. 3-2)

drives an input driven gear. The pinion gearshaft is

a. Drain lubricant from axle (LO 10-3930-609-12).

spline engaged in the input driven gear.

b. Remove front wheels (TM 10-3930-609-12).

c. Remove hub cap, cotterpin, nut and hub, and

The drive axle contains a differential gear arrangement

key from outer end of each axle shaft. Use a wheel

which is driven by the adapter pinion gearshaft. The

puller to withdraw hubs from tapered ends of axle

pinion gearshaft engages a ring gear secured to the

shafts.

differential case.

The two axle shafts are spline

engaged in the two side gears. The two axle housings

d. Disconnect brake tubing at adapters, being

provide mounting for the front wheel brake assemblies.

careful not to dent or kink tubing. Protect ends of tubing

to prevent entrance of foreign matter.

3-5. Removal of Adapter

e. Remove nuts and washers from studs holding

Removal of the adapter is required prior to disassembly.

brake assemblies to axle housings and withdraw brake

Refer to paragraph 2-24 for removal procedure.

assemblies. Oil seals will be retained in bores of brake

assemblies. Remove oil seals.

3-6. Removal of Drive Axle

f. Pull axle shafts out of axle housings; then,

Many parts which comprise the drive axle can be

remove both bearing cone and rollers and outer bearing

removed without removal of the axle from the truck.

cup from each axle shaft.

However, for general overhaul, remove the axle as

g. Pull inner bearing cups from recesses in axle

described in paragraph 2-24.

housings.

h. Remove screws and washers holding axle

3-7. Disassembly of Adapter (fig. 3-1)

housings to differential housing; then, withdraw axle

a. Remove cover screws and washers. Then

housings and shims.

remove cover and gasket from case.

i. Measure and note thickness of shims removed

b. Remove cotterpin from pinion gearshaft. While

from each side of differential housing for reference at

holding outer toothed end of gearshaft with a padded

reassembly and adjustment.

wrench, unscrew nut from threaded end of gearshaft.

j. Remove screws and nuts holding differential

c. Tap pinion gearshaft forward while holding input

housing halves together, then separate halves,

driven gear and withdraw gearshaft with front cone and

removing differential assembly, differential case

rollers.

bearings, and gaskets.

d. Lift input driven gear out of case.

k. If no match marks are visible on differential

e. Remove shims and spacer, rear bearing cup

case halves, lightly match mark parts with a punch or

and rear cone and rollers.

chisel before proceeding.

f. Remove retaining ring from groove in case.

l. Remove screws which secure case halves

g. Press front bearing cone and rollers from pinion

together; then, separate case halves, removing side

gearshaft.

gears, thrust washers, spider pinions and cross.

h. Remove packing, spacer, and seal from front of

m. Remove screws which secure ring gear to

case.

differential case half and withdraw ring gear.

n. Use a bearing puller to remove cones and

rollers from differential case halves.

3-2