TM 5-4930-244-14
c.
Installation.
(1)
Install back plate (3) onto spindle (14) and install five washers (13) and five nuts (12) onto spindle (14) studs.
Tighten five nuts (12). Install rubber plug (15).
(2)
Hold brake wheel cylinder (11) in place before securing It and install brake line (9) hand tight. This will prevent
cross threading fitting threads.
(3)
Install two bolts (10) through the back of back plate (3) into brake wheel cylinder (11). Tighten.
(4)
Tighten brake line (9) on rear of brake wheel cylinder (11).
(5)
Apply GAA grease to the areas on the backing plate (3) that support the brake shoes (8) (don't use too much
grease or get It on the brake shoes (8) or brake drum.
(6)
Install pins (7) through both sides of back plate (3). Install brake shoes (8) over pins (7) securing them with
springs and cups (6).
(7)
Lubricate the threads and the sliding surface of the button of the adjusting screw (5) with GAA grease.
(8)
Install retainer spring (4) and adjusting screw (5) to brake shoes (8).
(9)
Install retainer plate (2) and shoe springs (1) to brake shoes (8).
d.
Bleeding.
NOTE
Check the fluid level often during the bleeding operation and add brake fluid as
necessary to prevent the fluid level from falling low enough to allow air bubbles
into the master cylinder.
(1)
After hub and drum is installed, remove the brake cylinder cap (16) and fill the master cylinder (17) with brake
fluid.
(2)
Install brake cylinder cap (16) hand tight.
NOTE
Make sure that free end of hose (18) is below the level of brake fluid.
When bleeding, make sure the brake fluid coming out of the bleeder is not only
free of bubbles, but clean also.
(3)
Slide one end of plastic hose (18) over wheel cylinder bleeder screw (19). Place free end of hose into container
(20). Half fill the container (20) with brake fluid.
(4)
Have your helper pump the brakes a few times to get pressure in the system, then hold the pedal firmly
depressed.
(5)
While the pedal is held depressed, open the bleeder screw (19) just enough to allow a flow of fluid to leave the
valve. Watch for air bubbles to exit the submerged end of the plastic hose (18). When the fluid flow slows after a
couple of seconds, tighten the bleeder screw (19), then have your helper release the pedal.
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