TM 9-2320-363-20-1 Table 2-2.  Unit Preventive Maintenance Checks and Services (PMCS) for the M915 Family of Vehicles (Cont). Location Item Item to Check/ Not Fully Mission No. Interval Service Procedure Capable if: 17 Semi- Battery Box, f. Check battery cables for frays, splits, f.  Cables are missing, (Cont) annual Batteries and breaks. frayed, split, or broken. g. Clean battery box. h. Install batteries (page 4-254). i. Coat terminals lightly with grease (Item 14, Appendix C). WARNING Exhaust     pipe     and     muffler     can become   very   hot   during   vehicle operation.    Be  careful  not  to  touch these   parts   with   bare   hands   or allow body to come in contact with exhaust pipe and muffler.  Exhaust system     parts     can     become     hot enough to cause serious burns. 18 Semi- Exhaust a. Inspect exhaust manifold, exhaust annual System pipes, muffler, and tailpipe for leaks. Check for damaged pipes, loose clamps, and damaged gaskets and seals.  Replace damaged components as needed (page 4-88). b. Check that raincap operates freely. 19 Semi- Air System, a. Fully charge air system (TM 9-2320- annual Brakes (All 363-10). Models) and Central Tire b. Listen for sounds of leaks in all air Inflation lines and at valves and fittings. System (CTIS) (M917A1/ c. With air system  full pressurized, M917A1 apply a solution of detergent (Item w/MCS) 6.1, Appendix C) and water to air lines, valves, and fittings.  Tighten loose connections.  Make repairs as needed (pages 4-401 and 4-582). d. Inspect CTIS hoses at wheels for signs of chafing, rubbing, dry rot, punctures, or cuts.  Replace hoses as needed (page 4-582). Change 3  2-18.5