Bearing Installation

TM 5-4210-233-14&P-1

4-9. GENERAL MAINTENANCE PROCEDURES - Continued

i. Oil Seals. Install oil seals with seal lip 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 gauge sheet metal over the splines. Make sure the edges are bent slightly inward

to prevent these damaging the seal.

j. Bearing Installation.

CAUTION

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 freeze for a longer period of time.

CAUTION

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.

k. Lubrication. Lubricate bearings with the type of lubricant normally used before assembly (e.g., gear lube in

gear box bearing). This will provide lubrication during first run-in until system lubrication can reach bearings.

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