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 TM 55-1905-223-24-1
(3)
Replace a worn or broken ring gear (2) as follows:
WARNING
Wear protective clothing to prevent personal injury from burns.
CAUTION
Adjust the torch to a,good heating flame. Do not use a cutting flame (blue flame) to heat the ring
gear. Damage to the flywheel can result.
(a)
Use a torch to heat the ring gear (2).
NOTE
If a torch is not available, the ring gear can be removed with a brass drift and hammer. If this
method is used, support the gear ring on a wooden block.
(b)
Use a brass drift and hammer and drive the old gear (2) from the flywheel (3).
(c)
Inspect the flywheel (3) (the ring gear seat area) for damage.
WARNING
Use protective clothing to prevent personal injury from burns.
CAUTION
Do not attempt to install the gear without using heat. Do not exceed the specified temperature.
Damage to the gear will result.
(d)
Heat the new ring gear (2) in an oven to 450 (235 ) from 1 to 6 hours, or use a heating torch
F
C
not a cutting torch -- from the inside diameter of the gear so the heat travels outward to the teeth.
(e)
Stroke the gear while heating with a Tempilstick crayon, 600 (316 ) several times to prevent
F
C
overheating.
NOTE
The crayon will leave a chalk mark up to 6000F (316 ), then will leave a liquid smear.
C
CAUTION
Overheating the ring gear to 660 (349 ) will soften the gear and make it useless.
F
C
4-78
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