TM 10-4320-307-24
4-6
SPEED INCREASER REPAIR (CONT).
2.
Inspect and repair speed increaser and components as follows:
a.
Examine all parts carefully for grit, dirt, and abrasives and reclean them if necessary.
b.
Replace cast parts or housings that are cracked.
c.
Inspect bores for wear, grooves, scratches, and dirt. Remove burrs and scratches with crocus cloth or soft stone.
Replace parts that are deeply grooved or scratched.
Death or serious injury could occur if compressed air is directed against
the skin. Do not use compressed air for cleaning or drying unless the
pressure is/has been reduced to 30 psi (2.11 kgcm2) or less. When
working with compressed air always use chip guards, eye protection, and
other personal protection equipment.
d.
Inspect oil passages for obstructions. If an obstruction is found, remove it with compressed air or by working a
wire back and forth through the passage and flushing it with dry cleaning solvent.
e.
Inspect machined surfaces for burrs, scratches, nicks, and foreign matter. If such defects cannot be removed
with crocus cloth or a soft stone, replace the part.
f.
Inspect threaded openings for damaged threads. Chase damaged threads with a tap of the correct size.
g.
Inspect studs for damaged threads and looseness. Replace defective studs.
h.
Inspect dowel pins for wear or damage. Replace defective dowels. This applies where matched set of parts is
not involved.
i.
Inspect dowel pin holes for wear due to movement between mating parts. If a dowel pin hole is worn, rebore and
sleeve the hole when possible. Otherwise, replace the part. This applies where matched set of parts is not
involved.
j.
Inspect bearings for roughness of rotation. Replace the bearing if the rotation is rough.
k.
Inspect bearings for corrosion, scored, scratched, cracked, pitted or chipped races, and for indication of
excessive wear of balls or rollers. If one of these defects is found, replace the bearing.
I.
Inspect bearing bores and shafts for grooved, burred, or galled conditions that would indicate that the bearing has
been turning in its housing, or on its shaft. If damage cannot be repaired with crocus cloth, replace the part.
m. Inspect clutch driving plates for cracked or glazed surfaces, or for cracked, worn, or broken teeth. Check for
excessive wear. Replace damaged or worn driving plates.
n.
Inspect pressure and center plates for warpage and discoloration. Replace damaged plates.
o.
Inspect gears for scuffed, nicked, burred, or broken teeth. If defect cannot be removed with a soft stone, replace
gear.
p.
Inspect gear teeth for wear that may have destroyed the original tooth shape. If this condition is found, replace
gear.
q.
Inspect thrust faces of gears for scores, scratches, and burrs. If these defects cannot be removed with a soft
stone, replace gear.
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