Removal and Replacement of Brake Assembly Components

TM 11-5985-334-34

e. The brake assembly is mounted on the top side

of the lower guide plate and is held in place by a

machine bolt (31), spacer (32), and self-locking nut

(30) through bosses on the guide plate.

(1) To remove the brake assembly, remove the

bolts and nuts which hold the levers to the bosses on

the guide plate.

(2) Lift each lever up to remove the spacers.

(3) Remove the brake assembly by lifting it up,

out, and over the guide plate bosses.

2-7. Removal and Replacement of Brake

Assembly Components

(fig. 2-4)

a. Remove the brake assembly.

NOTE

The brake assembly is a loose assembly.

When the bolts and nuts other than the

eyebolt (10) are reassembled, tighten

them only enough to prevent endplay of

the bolt.

Figure 2-3(2). Launcher top and guide plate assembly,

b. The front and rear brake shoes (2 and 4) each

exploded view, AB-621/G (Sheet 2 of 2).

mounts with only one machine bolt (7) through the

front and rear levers (1 and 5).

NOTE

When reassembling a brake shoe to a

When the lower roller guide assembly

lever, check to be sure that the flat

casting is replaced, a new caution plate

projections of the brake shoe point

must be mounted.

toward the brake links (9) of the handle

(12) and that they are on the bottom side

c. Three drive screws are driven through the

of the brake assembly in order to fit under

caution plate (b above) into holes located and drilled

the brake retainer on the lower guide

by using the new caution plate as a template. Spot

plate.

and drill the three holes to a depth of 3/8 inch using

a No. 51 drill (.067 inch).

c. The brake assembly is replaced onto the lower

d. A guide roller and roller axle are removed for

guide plate by tilting it in the same angle as when

replacement by removing a retaining clip at one end

removing and pushing it into place over the bosses.

of the axle.

d. Replace the tubular spacers into the pivot

(1) Hold the roller while pulling the other end of

holes of the brake shoe levers.

the axle to slide the axle out of its bearings.

e. Insert the bolts from the top and tighten the

(2) To replace the roller or axle, position the

nuts on the underside of the guide plate to complete

roller in line with the axle bearings, replace the axle,

the assembly replacement.

and snap the retaining clip into the axle groove.

f. Adjust the brake as outlined in paragraph 2-8.

2-7