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 TM 9-2520-238-34
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING
0014 00
LUBRICATION INSTRUCTIONS -- Continued
INSPECTION
All removed parts must be inspected with care. Replace parts if damage or wear exceeds allowable limits.
22. GENERAL. Procedures for inspection will be the same for most parts. General inspection procedures are given in the
following steps. Special inspection procedures are covered in the task as needed.
23. CASTINGS.
a.
Use magnetic particle inspection equipment to check ferrous castings for cracks. Use a magnifying glass and strong
light to check nonmetal castings for cracks. Check areas next to studs, threaded inserts, sharp corners, and fillets.
b.
Inspect all castings and forgings for breaks, cracks, and wear or scoring that would impair function.
c.
Inspect machined surfaces for nicks, burrs, and raised metal. Mark damaged areas for repair.
d.
Use straightedge to check all mounting flanges on housings and supports for bends. Inspect mating flanges for
stains which would indicate oil leakage.
e.
Inspect all threaded parts for damaged or stripped threads.
24. ROLLER AND BALL BEARINGS. Inspect bearing races for wear and color changes due to heat. See TM 9-214 for
inspection procedures for ball bearings.
25. NEEDLE ROLLER 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.
26. STUDS. Inspect all studs for stripped or damaged threads, bent or loose condition, and signs of stretching.
27. GEARS.
a.
Use magnetic particle inspection equipment to check all gears for cracks.
b.
Inspect gears for burrs, wear, cracked or broken teeth, and pitting at tooth contact areas.
28. BUSHINGS AND BUSHING-TYPE BEARINGS.
a.
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, burrs, sharp edges, and signs of seizing.
b.
Check for dirt in oil holes and in bushing type bearings. Oil holes and grooves must be clean and not damaged.
29. OIL/GREASE SEALS.
a.
Inspect lip seals for cracks, wear, cuts, and brittleness. Inspect springs and seal shells for damage.
b.
Replace seals when there are signs of damage or oil leakage.
30. PREFORMED PACKINGS AND GASKETS
a.
Gaskets and seals on electrical parts may be reused. Inspect gaskets and seals for wear, nicks, cuts, and torn or
missing gasket material. Replace gasket if needed.
b.
All other preformed packings and gaskets should be replaced when removed unless otherwise stated in the
maintenance task.
31. CORE HOLE PLUGS. Inspect core holes for signs of leakage. Replace damaged core hole plugs.
32. INSERTS.
a.
Inspect inserts for cracks and stripped or damaged threads.
b.
Check inserts for loose fit.
0014 00-7
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