Wheel Bearings

(4) Inspect the bearing cones for pitting,

c. Installation. Install the wheel and tire assembly

scoring, wear, cracked cages, and for rough or binding

by reversing removal procedure. Refer to para 4-56 for

operation. Replace damaged bearings.

torquing of wheel bearings.

(5) Inspect the bearing cups for scoring,

scratches, nicks, and other damage. If damaged, drive

4-56. Wheel Bearings

the cups from the wheel hub using a soft drift.

a. Removal and Disassembly

Press in new bearing cups, taking care not to damage

Warning: Block the truck before attempting

the cups or hub.

to remove the wheels.

c. Packing Bearings. Pack the bearing cones and

(1) To raise the front end of the truck for

the interior of the hub with the lubricant recommended

wheel and tire replacement, tilt the mast back as far as

by the lubrication order. Take care to prevent dirt or grit

possible and install a wooden block under the mast

from contaminating the grease.

assembly. Tilt the mast forward to raise the front of the

During reassembly, pack the ring gear of the drive

truck. To raise the rear wheels for wheel and tire

wheels with grease.

replacement, use a jack or hoist. Place blocking under

d. Reassembly.

the frame.

(1) Reassemble the bearings and hub on the

(2) Remove the wheel and tire assembly as

spindle or steering knuckle in the reverse order of

directed in paragraph 4-55.

disassembly.

(3) Remove inner wheel bearing (9, fig. 4-53).

(2) Tighten drive wheel bearing nuts as

b. Cleaning and Inspection.

follows. Using a torque wrench, tighten nuts (5, fig. 4-

(1) Clean the bearing cones by flushing up

53) to a torque of 120 ft.-lbs. Just before maximum

and down in a cleaning solvent. If necessary, tap the

torque is applied turn wheel six times in each direction,

large side of the bearing against a soft wooden block to

then back nut off 300 minimum to 60 maximum so

dislodge solidified grease. Dry the bearings with clean,

cotter pin can be installed. While tightening the steer

dry compressed air. Direct the stream of air at the

wheel nut, rotate the wheel six times in each direction

bearing so that the rollers and cage will not spin. Dip

while torquing nut to 50 ft. lbs. Back nut off to 0 ft.-lbs.,

the bearings in light oil immediately after cleaning.

then retorque to 25 ft. lbs. while turning the wheel.

(2) Clean the hub and spindle (10) with a

Finally back nut off 30 o minimum to 60 maximum and

cloth dampened with cleaning solvent.

install the cotter pin.

(3) For the drive wheels, clean the ring gear

(3) Remove the blocking and lower the truck

and pinion with a cleaning solvent and dry with

to the ground.

compressed air.

Section XVI. MAINTENANCE OF THE STEERING SYSTEM

4-57. General

The rear wheels are used to steer the truck. Steering is

done by' a steering handwheel through the steering

valve, power steering cylinder, and the steer axle. The

steer axle is located beneath the engine at the rear of

the truck. The steering valve is mounted on the chassis

in front of the operator. Through the power steering

cylinder and pivot arm, the operator can turn the steer

wheels to control the direction of the truck.

4-58. Tie Rods

a. Removal and Disassembly.

(1) Remove the cotter pin and loosen the

adjusting plug in the end of the tie rod. Remove the tie

rod from the pivot arm. (fig. 4-54.)

(2) Remove the cotter pin nut and washer

from the tie rod at the steering knuckle. Refer to figure

4-55.

(3) Disassemble as shown in figure 4-56.

Figure 4-54. Tie rod removal (pivot arm end).

4-45