Service Brake Wheel Cylinder.

TM 10-3930-631-12

(1) Refer to figure 4-23 and assemble

4-35. Service Brake Wheel Cylinder.

adjuster assembly as follows:

a. Inspection. Refer to paragraph 4-37 and

(a) Install slide assemblies (1) with nylon

remove front drive wheel. Inspect wheel cylinder (fig. 4-

washers (2) between slides.

22) for leaks, damage and proper link movement.

(b) Secure slides with screws (5), nuts (6)

Replace wheel cylinder if necessary.

and washers (3-and 4). Tighten only finger tight.

b. Removal.

(1) Refer to paragraph 4-34 and remove

center distance of holes in ends of slides in 5 1/4 inches.

brake shoes.

(d) Tighten screws (5) to a torque of 14 to 16

(2) Refer to figure 4-20 and remove wheel

pound-inches.

cylinder as follows:

(e) Hold screws in position and tighten nuts

(a) Disconnect hydraulic brake line from

(6) to a torque of 29 pound-inches.

fitting in wheel cylinder.

(f) Check slip resistance of slide assemblies.

(b) Remove two screws and lock washers

Resistance must be 250 to 300 pounds.

securing cylinder to backing plate and remove wheel

(2) Refer to figure 4-22 and install brake

cylinder.

shoes as follows:

c. Installation.

(a) Install wheel cylinder links on bottom of

(1) Refer to figure 4-20 and install wheel

brake shoes and secure links with pins.

cylinder on brake backing plate as follows:

(b) Install adjuster assembly on brake shoes

(a) Install wheel cylinder on backing plate

and secure to brake shoes with spring pins.

and secure with two screws and lock washers.

(b) Connect brake line to fitting in wheel

links installed in ends of wheel cylinder. Hold shoes in

cylinder.

position with three return springs.

(2) Refer to paragraph 4-34 and install

(3) Refer to figure 4-21 and install dust

service brake shoes.

shield and secure with four screws and lock washers.

(3) Refer to paragraph 4-33 and bleed

(4) Refer to paragraph 4-37 and install front

brake system hydraulic lines.

drive wheels.

Section X. WHEELS

adjusted as described in paragraph 4-37.

4-36. General

4-37. Wheels and Tires

a. The front drive wheels are mounted on spindles

attached to the axles. Jackshafts, with pinion gears,

a. General. The front or drive wheel assemblies

extend through the brake assemblies and mesh with the

consist of the wheel and brake drum, tire, wheel

ring or bull gears in the wheels. Rotation of the pinions

bearings, and a ring or bull gear. The rear or steering

cause the ring gears to rotate around the spindles,

wheel assemblies consist of the wheel, tire and wheel

driving the truck.

bearings.

b. The rear steering wheels (fig. 4-26) mount on

b. Front Wheel Removal.

spindles attached to the steering axle. Action of the

(1) Raise the front of the truck until the

steering cylinder and drag link moves the pivot arm

wheel clears the floor. Tilt mast to full backward position.

assembly. Tie rods, extending to the spindles, are

Place a wooden block under the mast assembly and tilt

connected to the pivot arm. As the pivot arm moves, the

mast forward to vertical position. Movement of mast will

tie rods move the spindles, turning the wheels in the

elevate drive wheel clear of the floor.

direction of travel desired.

(2) Refer to figure 4-24 and remove front

c. Both pairs of wheels are mounted on tapered

drive wheel as follows:

roller bearings. The bearings must be greased and

4-28