TM 55-1930-209-14&P-21
Section VII.
Maintenance Of Brake
4-18. Brake System
a.
Brake band retainer fitting and brake actuating air chambers are located behind and below axis of drum shaft on
rear drum. Brake band retainer and brake actuating air chamber on front drum are level with and behind axis of drum
shaft. All other front brake band adjusting screws and related hardware are located approximately 20° clockwise facing
chain case side of winch.
b.
All drum brake components, except brake band attaching hardware are interchangeable. Refer to figure 4-7.
CAUTION
DO NOT interchange hardware from one drum to another. Wear patterns established after
extended use dictate that brake bands remain matched to their respective drums.
c.
All brake adjustment settings and adjustment screw settings are the same for front and rear drums.
NOTE
Remember that adjustment screws are rotated approximately 20° clockwise on front drum.
d.
Brake band actuating air chambers are dual direction air chambers. A large spring in mounting end of chamber
drives actuating piston outward to set parking brake. When air pressure is applied it counteracts spring and releases
parking brake. When air pressure is applied at end of chamber it forces piston forward against air pressure in parking
brake chamber and acts as service (working) brake. If air is shut off, pressure will bleed off both chambers and spring
will actuate parking brake side of air chamber and set parking brake.
4-19. Brake Assembly Removal
a.
Remove brake drum dust cover.
WARNING
Wear eye protection when using compressed air to avoid serious eye injury from blowing dust and
dirt.
b.
Use compressed air to blow all dust and dirt out of brake mechanism.
c.
Perform a preliminary inspection of the brake assembly.
(1)
Insure that parking brake is set.
(2)
Examine brake drum and brake band to insure that both drum and bands are round.
(3)
Examine brake band friction pads for evidence of uneven wear.
4-18
