TM 10-4610-241-24 TO 40W4-13-42 Table 2-1.  Unit Preventive Maintenance Checks and Services Location Item Interval Item To Check/ Procedure Not Fully Mission No. Service Capable If: (5) Latches operation, tight door closure and loose mounting hardware. (6) Ground connections for Ground strap mounting looseness and completeness. screw missing for panel and box. d.        Inspect    wire    from    main control Ground wire or wire panel to ground lug on frame for mounting screw missing looseness and corrosion. 5 Semi-Annual Chemical Feed a.  Drain oil and check for metal par- Oil is milky or has metal Pump Assembly tides on magnetic plug and milky particles condition. b.    Replace  oil,  and  check  that filler Breather unserviceable cover is tight and breather is not clogged 6 Semi-Annual Generator Set, 30 In accordance with In accordance with genera- Kw TM-6115-545-12 tor TM 7 Semi-Annual Storage Tanks, In accordance with TM In accordance with tank 3000 Gallon 5-5430-227-12&P TM 8 Semi-Annual Leveling Jacks Inspect    for    broken    welds    and proper Broken welds or improper operation.  Levelingjacks.  (LO operation 10-4610-241-12) 9 Semi-Annual Airbrake System Check   that   wheels   do   not   turn when Airbrakes do not hold air pressure is relieved 10 Semi-Annual Suspension As- Inspect for broken springs, corro- Springs broken or bolts sembly sion, and missing bolts missing 11 Semi-Annual Brakes Inspect brake linings for wear, Brake linings wom cracks and glazing 12 Semi-Annual Wheel Bearings Clean, lubricate (LO 10-4610-241-12) and repack wheel bearings (para.  2-87) 2-6