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
intervals.
(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
irregularity.
(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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