ARMY TM 9-6115-639-13 AIR FORCE TO 35C2-3-386-51 MARINE CORPS TM 10155A-13/1 Table 4-2.  Unit Level Preventive Maintenance Checks and Services for MEP 831A / 832A Item No. Interval Location: Item to Check/ Service Procedure Not Fully Mission Capable If: 1 100 hours Engine lubricating oil system NOTE:   First service occurs after 25 hours of engine operation.  Follow 100 hours intervals thereafter. Service engine lubricating oil and clean filter.    Refer to Lubrication Instructions (Para. 4-1).   Engine oil has not been changed or filter has not been cleaned. 2 100 hours Engine air filter a.  Open enclosure cover  to gain access to      engine air filter case. b.  Remove air filter (Para. 3-9). c.  Inspect air filter for dirt, clogging, or      obstruction.  Replace as required. d.  Install air filter (Para. 3-9). e.  Close enclosure cover and lock using      latches. Air filter is clogged, dirty, or damaged. 3 100 hours Battery electrolyte level Check battery electrolyte and gravity level (wet cell battery only).  Service as required (Para. 4-44). Battery electrolyte level is low. 4 300 hours Fuel filter / water separator Remove and replace filter / separator element (Para. 4-49). Filter / separator element has not been replaced.   5 300 hours Electrical system Inspect electrical receptacles for damage, corrosion, or evidence of electrical short. Check for bent, broken, or missing pins. Clean deposits from receptacles. Receptacles are damaged or burned. 4-10