TM 9-2350-247-20-1
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING
LUBRICATION INSTRUCTIONS — Continued
0128 00
WARNING
Air pressure in excess of 30 psi (207 kpa) can injure personnel. Do not direct pressurized air at
yourself or others. Always wear goggles.
m.
INSERTS. Blow out insert holes with compressed air.
n.
GASKETS. If a gasket is being removed, scrape old gasket material and sealant off mating surface. Clean mating
surface with cleaning compound (WP 0542 00, Item 9). Dry with wiping rag (WP 0542 00, Item 45).
3.
INSPECTION
All removed parts must be inspected with care. Replace parts if damage or wear exceeds allowable limits.
a.
GENERAL. Procedures for inspection will be the same for most parts. General inspection procedures are given in
steps b through q below. Special inspection procedures are covered in the task as needed.
b.
CASTINGS.
1) Inspect all castings and forgings for breaks, cracks, and wear or scoring that would impair function.
2) Inspect machined surfaces for nicks, burrs, and raised metal. Mark damaged areas for repair.
3) Use straightedge to check all mounting flanges on housings and supports for bends. Inspect mating flanges for
stains which would indicate oil leakage.
4) Inspect all threaded parts for damaged or stripped threads.
c.
BEARINGS. Inspect bearings for free and smooth rotation, and broken or missing rollers. Also look for tightness of
fit in bearing bores. Inspect bearing races for wear and color changes due to heat. See TM 9-214 for inspection
procedures.
d.
STUDS. Inspect all studs for stripped or damaged threads, bent or loose condition, and signs of stretching.
e.
GEARS. Inspect gears for burs, wear, cracked or broken teeth, and pitting at tooth contact areas.
f.
BUSHINGS AND BUSHING-TYPE BEARINGS.
1) Check all bushings and bushing-type bearings for secure fit in casting. Check for color changes which could
mean overheating. Inspect for size, scoring, out-of-roundness, burs, sharp edges, and signs of seizing.
2) Check for dirt in oil holes and in bushing-type bearings. Oil holes and grooves must be clean and not damaged.
g.
OIL SEALS.
1) Inspect feather edge of oil seals for tears, fraying, hardening, and cracking.
2) Replace metal-covered oil seals when there are signs of damage or oil leakage.
h.
CORE HOLE PLUGS. Inspect core hole plugs for signs of leakage. Replace damaged core hole plugs.
i.
INSERTS.
1) Inspect inserts for cracks and stripped or damaged threads.
2) Check inserts for loose fit.
j.
GREASE SEALS, PREFORMED PACKINGS, AND GASKETS.
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