Brake Wheel Cylinders

Air Hydraulic Cylinder (Power Brake Unit)

TM-9-2320-211-20 Truck Chassis: 5-Ton 6x6 M39 M39A2 M40 M40A1 M40A2 M40A1C M40A2C M61 M61A1 M61A1 M61A2 M63 M63A1 Manual
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185

C3, TM 9-2320-211-20

(5) Position the metal shield at the bottom of the air

hydraulic cylinder mounting brackets (fig. 2-184), install

2-193. Service Brakeshoes.

a. Removal.

four bolts and nuts, and tighten the nuts.

(1) Remove the wheel and tire assembly (para 2-

(6) Bleed the air hydraulic cylinder and wheel

207).

cylinders (para 2-190a).

(2) Remove the hub and drum assembly (para 2-

210).

2-192. Brake Wheel Cylinders.

a. Maintenance. Bleed each wheel cylinder as

(3) Install the clamp over the ends of the wheel

cylinder to hold the wheel cylinder pistons in position.

described in paragraph 2-190a.

b. Removal.

(4) Unhook the return spring (fig.2-185) from both

brakeshoes.

(1) Remove the wheel and tire assembly (para 2-

(5) Remove two retaining nuts, four cup washers,

207).

and two outer springs securing brakeshoes to guide pins

(2) Remove the hub and drum assembly (para 2-

(fig. 2-186).

210).

(3) Unscrew the connector securing the hydraulic

brake line (fig. 2-178) to the wheel cylinder at the back

side of the backing plate assembly and remove the line

from the cylinder.

(4) Unhook the return spring (fig. 2-185) from one

of the brakeshoes.

(5) Remove the two wheel cylinder capscrews (fig.

2-178) and lockwashers from the back side of the backing

plate assembly, and remove the wheel cylinder (fig. 2-185)

with its cover from the front side of the backing plate.

Figure 2-186. Removing brakeshoes and

anchor pins assembly.

(6) Remove the anchor pin locknuts (fig. 2-186) and

anchor pins from the front side of the backing plate

(7) Pull the anchor pins from tbe bore at the lower

Figure 2-185. Removing brakeshoe return spring.

end of the brakeshoes (fig. 2-186).

(8) Remove the two cup washers, two innersprings,

c. Installation.

guide pin retaining star washer and nut. Drive out old

(1) Position the wheel cylinder (fig. 2-185) with its

guide pins.

cover on the front side of the backing plate assembly,

b. Installation.

install the two wheel cylinder capscrews (fig. 2-178) with

(1) Install large end of redesigned guide pin into its

lockwashers in the holes at the back side of the backing

hole in backing plate and fasten with star washer and

plate, and tighten the capscrews.

locknut.

(2) Install the return spring (fig. 2-185) between the

(2) Hold pin with a 3/8 inch open end wrench and

brakeshoes.

tighten nut until shoulder of pin bottoms against the

(3) Position the hydraulic brake line (fig. 2-178) at

backing plate.

the wheel cylinder inlet on the rear backing plate

(3) Install anchor pins (fig. 2-186) with the anchor

assembly and tighten the connector.

pin plate in the bore at the lower end of the brakeshoes.

(4) Install the hub and drum assembly (para 2-210).

Turn the anchor pins to position the punchmarks (which

(5) Install the wheel and tire assembly (para 2-207).

indicate the high side of the anchor pin cams) toward

(6) Bleed the wheel cylinder (para 2-190a).

each other.

(7) Adjust the brakes, using the minor adjustment

procedures (para 2-188a(2)).

2-158

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