TM 10-4610-239-10 TM 08580B-10/1 Table 2-2.  (Army) Operator/Crew Preventive Maintenance Checks and Services (Trailer) NOTE Within designated intervals, perform these checks in the order listed.  Perform weekly PMCS as well as BEFORE operations PMCS if: (1) You are the assigned operator and have not operated the ROWPU since the last weekly PMCS. (2) Operating the item for the first time. B-Before D-During A-After W-Weekly M-Monthly Interval Procedures: Equipment is Item Item to be Check for and have repaired not ready/ No. B D A W M Inspected or adjusted as necessary available if: 1 • • Towing vehicle Check that 24 V power supply 24 V not available. electrical system is available to trailer. 2 • • • Electrical connector Check that connector and cable Broken cable or and cable in good condition, insulation connector. unbroken, connector free of dirt and corrosion. 3 • • • • Lights Check that tail light, stoplights, Light system and blackout light work properly. inoperative. 4 • • • Chassis wiring Inspect for frayed or worn Wiring excessively spots in wiring harness. frayed, worn or deteriorated. 5 • • • • Service brake Start engine of towing vehicle to Pressure on brake system build up air pressure in brake pedal in towing system.  Check for proper operation vehicle does not of brakes activate trailer brakes. 6 • • Air hose couplers Make sure couplers are securely Couplers broken. attached to towing vehicle (or dummy couplers if trailer not attached to a towing vehicle). 7 • • • Air hoses Check for cracks, leaks, or Hoses broken or other damage. leaking. 8 • Air brake tubing Inspect for bends, dents, and Parts badly damaged reservoir, and other leaks which may interfere or leaking. components with proper operation. 9 • • Air reservoir Drain condensation by opening Draincock broken draincock; close draincock or corroded. after draining.  Check for broken or corroded draincock. 2-20