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TM 5-4210-220-34
k.
Oil Seals
Install oil seals with lip seal facing the source of oil. Install by carefully applying an even force on the outer
edge of the seal. If oil seals are to be installed over a keyed or splined shaft, use a guide.
This will prevent the sharp edges of the shaft damaging the lip seal. Make a guide by cutting and shaping
very thin gage sheet metal over the splines. Make sure the edges are bent slightly inward to prevent these
from damaging the seal.
I.
Bearing Installation
To prevent personal injury or premature bearing failure when removing or installing bearing races, always exert
force on the tight ring of the bearing.
To assist in bearing installation procedures it is acceptable to heat or cool bearing races. Outer bearing races can
be cooled to reduce the race diameter. Place bearing In a deep freeze for about two hours prior to assembly. It
is acceptable to leave bearing in deep grease for a longer period of time.
To avoid bearing failure, never heat a bearing using an open flame. Inner bearing races can be heated to
increase the race diameter. An electrically-heated-type oil bath is recommended. Do not allow oil temperature to
exceed 275 deg. F (135 deg. C). The preceding procedure can also be used to help during installation of gears
on shafts. If accessible, shafts may be cooled to reduce outer diameter, and gears may be heated to increase
inner diameter.
m.
Lubrication
Lubricate bearings with the type of lubricant normally used before assembly (e.g. gear lube in gearbox
bearing). This will provide lubrication during first run-in until system lubrication can reach bearings
n.
Electrical Items
Replace broken, worn or burned electrical wiring with wire of the same carrying capacity. Always refer to tags
and sketches made at removal.
p.
Testing
Test operation of any system after installation or repair. Inspect for leaks, vibration, noise, misalinement or
other problems. Recheck after a few hours of normal operation.
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