37
There are various degrees of self-alignment in bear ings
of the same man u fac tur er. The force required for the self-
alignment of the bear ings used in YORK man u fac tured
units has been spec i fi ed and is close ly monitored at the
fac to ry. If it is nec es sary to purchase a bearing locally,
be sure it can be worked around in the housing with a
short shaft made of wood or other soft material placed
in the bearing.
Prior to installing the bearing on the shaft, it should
be worked around in the housing to make sure that
self-alignment will be obtained where the bear ing is
in stalled. After the shaft journal has been in spect ed for
clean li ness, metal chips or burrs, the bearing is slipped,
not forced, onto the shaft. Forc ing the bear ing onto the
shaft by the use of fl ange, pillow block, or outer ring
will dam age the bearing in ter nal ly. Force ap plied in this
way transmits the load to the inner race through the balls
in the bear ing. Since the bearings are not de signed for
axial load ing, the sides of the races in which the balls
turn can be damaged. If the bear ing cannot be made to
slip onto the shaft by press ing on the inner ring of the
bear ing, check the shaft for burrs. In stall the bearing so
the part of the inner race, which receives the locking
collar or contains setscrews, is toward the outside of
the unit.
If the grease fi tting must be changed on bearings that
utilize a locking pin under the fi tting, it is important
to properly replace it. If an adapter or grease fi tting of
im prop er size and length is used, the locking pin may
be either too tight or loose and can affect the alignment
and re-lubrication of the bearing.
Bearing Locking Devices
Various types of locking devices are used to secure
bearing(s) to the fan shaft.
Refer to the instructions
packed with bearings for special information.
The
various locking devices can be classifi ed under basic
types: setscrew-type locking type, eccentric locking
type, concentric locking type, and Skwezloc type.
4
JOHNSON CONTROLS
FORM 145.05-NOM2 (807)
Summary of Contents for YSCD
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