TM 5-3895-370-14&PNOTE·The free stroke sets the clearancebetween the linings and brakedrum.·If when checking free stroke aspart of Preventive Maintenance,the free stroke is not withinspecifications, refer totroubleshooting (Para 4-13) tocorrect the problem prior toproceeding.·The difference betweenmeasurement B andmeasurement A is the free stroke.Free stroke must be between 5/8to 3/4 in. (16-19 mm).(5)Using a pry bar, move slack adjuster (3) so thatlinings (4) are against drum (5). Measure thedistance from center of anchor pin (6) to back ofbrake chamber (1) again (measurement B).CAUTIONDo not set free stroke shorter than5/8 in. (16 mm). If free stroke is tooshort, brake linings can drag anddamage brakes.NOTEPerform Step (6) if free stroke is morethan 3/4 in. (19 mm) or less than 5/8in. (16 mm).(6)While moving slack adjuster (3) with pry bar, turnadjusting nut (2) 1/8 turn at a time in the requireddirection and check the free stroke again.(7)Refer to a. Caging/Uncaging Brakes anduncage brake chamber (1), then attachdistributor air lines to tow vehicle (para 2-9).4-265
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