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TM 5-4210-233-14&P-1
4-9.
GENERAL MAINTENANCE PROCEDURES - Continued
4-9.3.
General Inspection Instructions
a.
Sealing Surfaces. Check all contact surfaces of gaskets, packings, or seals. Ensure there are no nicks,
burrs, or scratches. These might damage new seals during assembly. If any defect is found, correct it as
outlined in para 4-9.4 following.
b.
Ball and Roller Bearings. Check bearings for pitted balls, races, or separator. Bearings shall be rejected
if any of the following are seen in the race load area.
(1)
Cuts or grooves parallel to ball or roller rotation.
(2)
Fatigue pits (not minor machine marks or scratches).
(3)
Cracks found during magnetic particle inspection.
(4)
Serious abrasion of balls or rollers.
(5)
Serious discoloration of any part of the bearing.
c. Drain Plugs. When removing drain plugs from transmission, engine, or axles, inspect the plug. A build-
up of grit and/or fine metal particles may indicate part failure. A few fine particles are normal.
d.
Tubing and Hoses. Check all hose surfaces for broken or frayed fabric. Check for breaks or weak points
due to kinking or rubbing. Inspect metal tube lines for kinks or excessive corrosion. Inspect fitting threads
or clamps for damage. Replace any faulty part. After assembly, check all disturbed joints for leaks.
e.
Splines. Inspect shaft splines for wear. This will include pitting, peening or fatigue cracks. Perform
magnetic particle inspection if needed.
f.
Electrical Parts. Inspect all wiring for chaffed or burned insulation. Check all terminals for tightness.
Check all lamps for failure. Check for burns, or broken fittings or components.
g.
Gears. The following steps should be used to make a general visual inspection of all gears. Specific
tests for particular gears, outlined in the text, should also be carried out. It any gear looks faulty, perform
a surface temper and/or magnetic particle inspection.
(1)
Normal Wear. Loss of metal from surface of teeth. Wear must not prevent gears from meshing
or performing properly.
(2)
Initial Pitting. This may occur when gears are first put into service. It may continue until high
spots have been reduced. It will not affect contact surfaces. This pitting is not necessarily serious.
(3)
Destructive Pitting. This pitting occurs after initial pitting, often at an increasing rate. This type
will destroy the contact area and reduce the load capacity of the gear. Rapid destruction will
occur with use.
4-150
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