Table 4-1. Unit Preventive Maintenance Checks and Services (PMCS).
H Hours of operation
W - Weekly
M - Monthly
S - Semiannually
A - Annually
Fuel Strainer and
Open drains on fuel strainer and primary and
secondary fuel filters. Drain water and
sediment. Allow to drain until fuel runs
Open drains on main fuel tank and day tank.
Drain water and sediment. Allow to drain
until fuel runs clean.
Clean or replace, as necessary, fuel strainer
in bottom of fuel pump.
Perform a hydrometer test on batteries every
100 hours. Refer to TM 5-6115-464-12
for test procedures.
Inspect for worn, frayed, cracked or oil-
soaked belt. Check adjustment. If necessary,
adjust for a 1/2-inch deflection when belt
is depressed at a point midway between
alternator and water pump pulley.
Replace filter elements every 100 hours
Clean fuel strainer every 300 hours of
Change lubricating oil and filters every 300
hours of operation or six months.
Inspect for damage. Clean breather and tube
at oil change interval.
Drain and refill (para 3-97,
Replace filter (para 3-97,
Clean filter (para 3-98,