NTN - Plummer Blocks


Handling the Plummer Blocks and Bearings

9.6 Maintenance and inspection

To be able to use a bearing to its design life and avoid

any accident, check the following points at regular


(1) Running sound on bearing

(2) Temperature on bearing or plummer block

(3) Vibration on shaft

(4) Leaking grease or worn oil seal

(5) Loose tightening and mounting bolts

(6) Trouble-free operation of the lubrication system, and

loosening or leakage with piping

9.7.2 Cylindrical bore bearing

Usually, a cylindrical bore bearing is interference-fitted.

Thus, the bearing is simply drawn out by placing a jig to

the face of the inner ring and exerting a force as

illustrated in Fig. 9.29 with a hand press. However, be

careful not to apply a force to the outer ring. A puller such

as that shown in Fig. 9.30 is often used. When using this

tool, make sure that the jig is fully engaged with the face

of the inner ring.

If the bearing arrangement must be inspected while it is

at a standstill, check it for the following points:

(1) Check appearance the of bearing for any


(2) Fouling of grease, or contaminants (dust or steel

dust) in grease

(3) Loose adapter sleeve

(4) Worn or damaged seal

9.7 Bearing disassembly

9.7.1 Bearing with adapter

Straighten the bent tab on the washer, and loosen the

nut by two to three turns. Place a drift to a face of the nut.

Lightly tap the drift to turn the sleeve (Fig. 9.28). Once

the sleeve is shifted in the axial direction, the bearing can

be easily removed.

Note, however, when the nut has been excessively

loosened and only a few ridges remain engaged, and if

the nut is further tapped, the threading on the sleeve or

nut may be stripped.

Fig. 9.29

Fig. 9.30

Fig. 9.28


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