ARMY TM 9-6115-670-14&P 4-7 4.8. WARNINGS, CAUTIONS, AND NOTES. Always observe WARNINGS, CAUTIONS, and NOTES appearing in your PMCS table.  Warnings and cautions appear before applicable procedures.  You must observe WARNINGS to prevent serious injury or death to yourself and others.  You must observe CAUTIONS to prevent your equipment from being damaged. You must observe NOTES to ensure procedures are performed properly. 4.9. APU LUBRICATION INSTRUCTIONS. 4.9.1. Diesel Engine Lubrication Instructions.  The APU's engine oil level shall be checked on a daily basis (para 3.1.). Engine oil shall be replenished as needed. Engine oil and oil filter shall be changed every 100 hours of operation (para 4.14. and 4.15.). 4.9.2. 10 kW Generator Lubrication Instructions.  There are no lubrication instructions for the 10 kW generator. 4.9.3. Army Oil Analysis Program (AOAP).  The APU is enrolled in the AOAP.  (Refer to AR 738-750.) Table 4-2.  Unit Preventive Maintenance Checks and Services (PMCS) Item No. Interval Item To Check/Service Procedure Not Fully Mission Capable If: 1 40H Radiator Check coolant level.  Add coolant as required (para 3.8.). Coolant is exhausted. 2 50 H Fuel pipes/clamps Inspect for loose connections or excessive wear. Hoses are loose or excessive wear or deterioration is visible. 3 100 H APU   Check entire APU for missing, loose, or damaged parts and hardware. Check for unusual wear or deterioration. Missing, loose, or damaged parts and hardware, or unusual wear. 4 100 H Engine oil Replace engine oil (para 4.14.). Used or dirty oil. 5 100 H Oil filter Replace oil filter   (para 4.15.). Clogged or dirty oil filter. 6 100 H Breather and Breather Tube Inspect breather and breather tube for damage or blockage. Clean breather and breather tube (para 4.27.). Breather or breath- er tube damaged or blocked.  Dirty breather or breather tube. 7 100 H Fuel filter   Clean fuel filter   (para 4.30.). Water or sediment in fuel filter. NOTE If the equipment must be kept in continuous operation, check  and  service  only  those  items  that  can  be checked  and  serviced  without  disturbing  operation. Make  the  complete  checks  and  services  when  the equipment can be shut down.