ARMY TM 9-6115-670-14&P 2-7 Table 2-2.  Operator Preventative Maintenance Checks and Services (PMCS) for Auxiliary Power Unit, 10 kW, 120/240 VAC, 60 Hz Location Item No. Interval Item to Check/Service Procedure Not Mission Capable If: 1 Before Generator Set Check for loose, broken or missing hardware. Check for fluid leaks. Check for any loose wires or broken meters. Level III fluid Leak exists. Before/ During Ground Cable and Connection Inspect ground rod and cable for loose connections, breaks, damage and corrosion.   Check for paint. Cable is missing or damaged or components are not free of paint. 2 Before Engine radiator Check coolant level. Coolant level should be halfway between "FULL" and "LOW" marks on radiator overflow tank; add coolant if needed (para 3.8.). Coolant level is well below radiator port. 3 Before   Radiator hose Check for leaks. Class III leak exists (para 2.2.5, 4.7.4.). 4 Before Radiator overflow tank Check coolant level.  Coolant level should be halfway between “FULL” and “LOW” marks. (Figure 2-2) WARNING Hot coolant is under pressure.  Do not remove radiator cap when engine is hot. Allow engine to cool completely before   removing   radiator   cap.      Once   cooling   has occurred,  loosen  cap  slightly  to  relieve  any  excess pressure before removing the cap completely.  Failure to observe this warning could result in burns or injury to personnel. CAUTION Be  sure  to  close  radiator  cap  securely.  If cap is loose or improperly closed, coolant may    leak    out    and    the    engine    could overheat