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TM 5-2420-222-34
3-15.
IDLER GEARS REPLACEMENT (Con’t).
b.
DISASSEMBLY
CAUTION
Do not remove spring pins unless damaged.
Removal may damage parts.
NOTE
Step applies to either upper or lower idler
gearshaft. Lower idler gear-shaft is shown.
Drive spring pin (4) our of lower idler gearshaft (3).
c.
CLEANING AND INSPECTION
WARNING
Dry cleaning solvent, P-D680, is toxic and flammable. Always wear protective
goggles and gloves, and use only in a well-ventilated area. Avoid contact with
skin, eyes and clothes, and DO NOT breathe vapors. DO NOT use near open flame
or excessive hear. The solvent’s flash point is 100àF - 138àF (38C-59C). If you
become dizzy while using cleaning solvent, immediately get fresh air and medical
help. If solvent contacts eyes, immediately wash your eyes and get medical aid.
1.
Clean upper and lower idler spur gears with dry cleaning solvent.
2.
Clean oil passage holes with nonelectrical wire and flush with dry cleaning solvent. Dry with clean rags.
3.
Clean all other parts with dry cleaning solvent. Dry with clean rage.
4.
Inspect all metal parts for cracks, bends, or breaks. Replace all defective parts.
5.
Inspect all threaded parts for damaged threads. Restore damaged threads using screw threading set.
6.
Inspect upper and lower idler spur gears for burrs, abnormal wear, and damaged teeth. Remove burrs with
sharpening stone. Replace if defective.
7.
Using micrometer caliper set, measure width of upper and lower idler spur gears at hub. Width must be 0.8650-
0.8690 in. (21.9710-22.0726 mm).
NOTE
If upper or lower idler gearshaft needs replacing, spring pin must also be replaced.
8.
Using vernier caliper, measure outside diameter of upper or lower idler gearshaft (3 or 14). Outside diameter
must be 1.7495-1.7515 in. (44.4373-44.4881 mm).
TA701279
3-91
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