TM 5-3825-225-14&PSection V. BRAKE SYSTEM MAINTENANCE5-12. BRAKEDRUM REPAIR.a. Inspection.WARNINGDO NOT handle brakeshoes, brakedrums, or other brake components unless areahas been properly cleaned. There may be asbestos dust on these componentswhich can be dangerous if you touch it or breathe it. Wear an approved filtermask and gloves. Never use compressed air or a dry brush to clean brakecomponents. Dust may be removed using an industrial-type vacuum cleaner.Clean dust or mud away from brake components with water and a wet, soft brushor cloth. Failure to follow this warning may result in serious illness or death topersonnel.(1) Remove hub, wheel bearings, and brakedrum (see paragraph 4-25).(2) Ensure that the inside surface of the brakedrum is smooth, true, and concentric.CAUTIONThe maximum allowable eccentricity is 0.004 in. (0.10 mm) to prevent equipment damage.(3) Ensure that the brakedrum is not bulged, bell mouthed, scored, or eccentric.(4) If any of the above conditions exist, turn the brakedrum or replace them.b. Repair:CAUTIONEach time brakedrums are turned, less metal remains to absorb the heatdeveloped by braking action. Brakedrums containing less metal will operate athigher temperatures. As a result, brake fade, slow recovery, and erratic action willbe morenoticeable. The extremely high temperatures will not only shorten lininglife but can also cause heat checks and cracks to form onthe inner surfaces ofthe brakedrums. These conditions will become progressively worse until thebrakedrums fall.(1) Use the correct size cone and mount the brakedrum on the lathe. Ensure that it is centered accurately.(2) Turn the brakedrum. Take only light cuts and remove only enough material to clean up the brakedrum.(3) Grind the finished surface. Use emery cloth on a straight board if a grinder is not available. Polish theinside surface of the brakedrum.(4) Clean brakedrums with steam or hot water. Do not use solvent.(5) Brakedrums that do not need to be turned should be rubbed with emery cloth or fine sandpaper andwashed.(6) Clean any metal particles or debris from inside the brakedrum before installing it.(7) Install brakedrum, wheel bearings, and hub (see paragraph 4-25).Section VI. FRAME AND TOWING ATTACHMENTS MAINTENANCE5-13. LADDER MODIFICATION.a. The following modification is at the discretion of the unit commander.b. The fourth rung from bottom of ladder is close to the semitrailer body. Personnel can slip on this rung.5-8
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