TM 10-3930-638-24&P 2-7.  ORGANIZATIONAL  PREVENTIVE  MAINTENANCE  CHECKS  AND  SERVICES  (cont) Legend W - Weekly S - Semiannually Q - Quarterly A - Annually Item Intwerval ITEM TO BE INSPECTED No. W Q S A PROCEDURE PERFORM OPERATOR/CREW PMCS PRIOR TO OR IN CONJUNCTION WITH ORGANIZATIONAL  PMCS  IF: a. There is any delay between the daily operation of the equipment and the organizational PMCS. b.  Regular  operator  is  not  assisting/participating. 1 AIR   CLEANER WARNING If NBC exposure is suspected, all air filter media should be handled by personnel wearing protective equipment. Consult your unit NBC Officer or NBC NCO for appropriate handling or disposal proce- dures. Remove element and blow from inside out with low pressure air, replace if defective. Reset contamination  indicator. 2 PARKING BRAKE LINKAGE Check linkage for loose or missing hardware. If adjusting knob does not tighten enough, adjust linkage. 3 SERVICE BRAKE Inspect brake pads, if 3/32 inches or less, or contaminated, replace. Reference page 2-282, para 2-43a. Check that brake pedal has 1/4 -1 inch free travel and is at least two inches from floor when fully  applied. Inspect the wheel cylinders for cracks, leaks, or broken end; inspect the brake shoe for cracks, and inspect backing plates for bends, cracks and loose rivets. Ref. page 2-282, para 2-43a. In spect entire hydraulic brake system for leaks, cracked lines and worn hoses. Ref. page 2-290, para  2-43b.  Replace  all  defective  parts  as  required. Adjust service brake assembly. Reference page 2-286.1, para 2-43a. 4 AXLES WARNING DRY CLEANING SOLVENT (P-D-680), used to clean parts is toxic and flammable. Wear protective goggles and gloves and use only in a well ventilated area. Avoid contact with skin, eyes, and clothes and don’t breathe vapors. If contact with eyes is made, wash eyes with water im- mediately, and obtain medical aid immediately. Service breathers. Rmove and immerse in solvent (P-D-680); dry with compressed air. 5 CHASSIS Check chassis, brackets, and mounting and ensure that they are in good condition and secure. 6 SIDE SHIFT FRAME Check that chain pulleys are securely fastened. Check side shift bars for excessive wear. defer mation,  and  bent  condition. 7 SPARK ARRESTING MUFFLER Blow carbon and soot from muffler (para. 2- 16) 2-4 Change   5