TM 55-1930-209-14&P-21
NOTE
Before disassembling idler gear assembly, check gear, hub, and bearing assembly for any
perceptible wobble or shake when pressure is applied by firmly grasping rim of gear with
both hands and rocking. If gear is satisfactory, it will only be necessary to check pre-load
before installation.
Component parts of idler gear bearing are mated; therefore, match-mark parts during
disassembly so they can be reassembled in their original position.
e.
Remove crankshaft timing gear as follows:
NOTE
Crankshaft gear can be inspected on crankshaft and should not be removed unless
replacement is required or complete engine overhaul/crankshaft replacement is in
progress.
(1)
Remove retaining nut and rear oil seal sleeve if one is installed.
(2)
Use a three prong gear puller that can be aligned with holes in gear and pull crankshaft gear off shaft.
6-29
Gear train cleaning, inspection and repair
a.
Cleaning. Wash all parts with cleaning solvent and dry thoroughly.
b.
Inspection and Repair
(1)
Inspect bearings for excessive wear, pitting, scoring, or flat spots on roller or races.
(2)
Inspect idler gear.
(a) Examine gear teeth and bearing for scoring, pitting, or wear. If gear teeth are worn or bearing is
excessively damaged, replace assembly or install a new bearing in gear.
(b) Test pre-load (or axial load) of bushing after installation. It must sustain a 2000 lb load without
pushing out of gear.
NOTE
Bushing must not protrude beyond gear face.
(3)
Repair by replacement of defective parts.
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