BEARING AND LUBRICATION PART 3

[jack moor]

BEARING AND LUBRICATION PART 1

 

BEARING AND LUBRICATION PART 2

 

 Removal Of Bearing

 In case that the bearing is so damaged as to hinder motor operation, the bearing is to be removed in the following manner.

Remove the bearing housings such as the bearing end cover, the bracket, the bearing housing, etc.

Remove the grease runner or ring nuts by loosening the set screws, if
provided, or by removing the washer stopper if the ring is tightened by
means of the screws or binding nuts.

Draw out the bearing as shown in Fig. 1-5.

 

Fig. 1-5 Removal Of Bearing

Caution

In carrying-out disassembly, place
the disassembled parts in order on a clean work table, and protect them
against dust and dirt. Prepare various jigs necessary for removal
depending on the type of machine.

Fitting Of Bearing

The bearing is to be fitted in the following manner

Caution

The
anti-friction bearing is of higher precision than other mechanical
parts, and so a due care is to be given to its handling to prevent them
from becoming dusty, stained, scratched and marred.

Before fitting the bearing in
position, its neck and threaded parts are to be made perfect, and
cleaned completely by means of cleaning oil. the ring nut is to be
temporarily fitted to the shaft beforehand to see if it is perfectly
matched to it.

The end cover, grease runner, ring nut and locking washer are to be cleaned beforehand.

The bearing is to be heated in oil for expansion of its inner diameter.

Caution:
The heating temperature should not exceed 120ºC. The temperature higher
than this will reduce the load tolerance of the bearing steel, thus
resulting in the shorting of its durability.

The heated bearing is to be set in place after the inside and cover has been fitted.

The inner ring of the bearing is to
be tightened fully against the shoulder part of the shaft after the
ring nut has been tightened. After the bearing has cooled down to room
temperature, the ring nut is to be tightened again and locked with a
washer.

Fill the space between the bearing
races and the balls with grease. Inject grease into the inside end
cover space, the grease amounting to 1/2 to 1/3 of the capacity.

The housings such as the bracket, bearing housing, etc. are to be fitted in position.

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