INSTALLATION - TM-10-3930-607-150167

BRAKES

condition, can be removed by sanding with coarse

4. Place one of the return spring hooks in one shoe

sandpaper.

and stretch the spring far enough to hook to other end in

the opposite shoe.

4. The brake shoe linings should be replaced if

worn almost to the table or if the bonding agent is

5. Hook one end of the retaining spring in a brake

failing. Do not attempt to save lining with deep scores

shoe hole and the other end in the hole of the opposite

or soaked with either grease or brake fluid.

shoe.

5. Check all springs and shoe hold-down parts.

6. Back off adjusting cams.

Discard any part that is broken, rusted, twisted, nicked

or appears fatigued.

7. After making sure there is no dirt in the wheel

drum assembly, slide assembly onto the hub, being

6. Replace wheels with elongated mounting holes.

careful not to damage the stud threads. Place a tapered

Check threads on wheel studs and wheel nuts.

dowel on the proper studs and secure assembly with the

attaching nuts.

7. Check adjusting cams and cam friction lock

springs. Cams should turn easily, but must not be

8. Bleed the hydraulic system and apply the

loose. If the cam is seized, soak in kerosene or

brakes, to center the shoes.

penetrating oil to loosen.

9. Adjust the brakes. Remove the blocks.

NOTE: For best results, the new linings should be

ground concentric with the brake drums. If this is

10. Test

braking

and

inching

under operating

not done, high spots may prevent proper lining to

conditions.

drum contact and proper adjustment. Linings are

ground before or after the relined shoes are

E. BRAKE ADJUSTMENT

installed on the axles, depending upon the type of

grinding equipment in use. Regardless of grinder

type, the known drum diameter (measure with

1. Raise the drive wheels. Remove the large pipe

micrometer if unknown) is transferred to the grinder

plug from the face of the wheels.

and the shoes are mounted and advanced into the

grinder wheel as required to make one complete

2. Release the parking brake. Turn the wheel until

grinding cut the full width and length of the lining.

the large hole is in line with an adjusting cam.

D. INSTALLATION

3. Using a large screw driver, tighten an adjusting

cam; then, loosen it just enough to allow the wheel to

1. Install the wheel cylinder, if it was removed.

turn. (Fig. 6) A slight drag is permissible. Adjust the

remaining cams in the same manner.

2. Insert push rod end of each shoe in wheel

cylinder and center brake shoe on backing plate.

NOTE: To set the shoes closer to the drum, tighten the

front adjusting cams by turning them clockwise. Turn

3. Install hold-down pins, cups and springs in the

the rear cams counter-clockwise to tighten them.

reverse order of removal.

B-131