TM 9-2330-203-14&P
4-21. SERVICE BRAKE ASSEMBLY REPLACEMENT (LATE MODEL M197A1 AND M198A1) (Con't).
b. CLEANING AND INSPECTION
WARNING
DO NOT handle brake shoes, brake drums, or other brake components unless area has been
properly cleaned. There may be asbestos dust on these components which can be dangerous
If you touch it or breathe it. Wear an approved filter mask and gloves. Never use compressed
air or a dry brush to clean brake components. Dust may be removed using an industrial-type
vacuum cleaner. Clean dust or mud away from brake components with water and a wet, soft
brush or cloth. Failure to follow this warning may result In serious Illness or death to
personnel.
Dry cleaning solvent, P-D-680, Is toxic and flammable. Always wear protective goggles and
gloves, and use only In a well-ventilated area. Avoid contact with skin, eyes, and clothes, and
DO NOT breathe vapors. DO NOT use near open flame or excessive heat. The solvent's flash
point Is 1000F-138F (380C-590C). If you become dizzy while using cleaning solvent,
Immediately get fresh air and medical help. If solvent contacts eyes, Immediately wash your
eyes and get medical aid.
1.
Clean all parts with dry cleaning solvent. Dry thoroughly.
2.
Inspect all parts for damage. Replace any damaged parts.
3.
Inspect brake shoes for cracks, distortion, and excessive wear. Brakeshoe lining should have a minimum
thickness of X in. (3.2 mm). Replace brakeshoe assembly if cracked or if brakeshoe lining thickness is less than X
in. (3.2 mm).
4.
Inspect brakeshoe lining rivets (20) for looseness. Rivets should be at least 16 in. (1.6 mm) below surface of
brakeshoe lining. If rivets are less than 16 in. (1.6 mm) below surface of brakeshoe lining, replace brakeshoe
assembly.
5.
Inspect sleeve bushing (21) in each brakeshoe for damage or wear. If damaged or worn, drive out and replace.
c.
INSTALLATION
1.
Install backing plate (12) on axle using ten new bolts (19) and new locknuts (16).
2.
Install wheel cylinder (6) and shield (7) using two screws (15) and new lockwashers (14) (para 4-23).
3.
If removed, install two shouldered pins (13) through backing plate (12). Install compression spring (11) and
adjusting cam (10) on each shouldered pin. Peen end of shouldered pin to hold cam and compression spring in
place.
4.
Install spring tension washer (9) on each shouldered pin (13).
5.
Install headless pin (4) in each brakeshoe (5) using two new cotter pins (3).
6.
Install two brake shoes (5). -
7.
Install each pivot pin (22) using new lockwasher (17) and nut (18).
8.
Install anchor link (23) over pivot pins (22) and secure with two slotted washers (24).
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