York YPAL 051 User Manual

JOHNSON CONTROLS

FORM 100.50-NOM6 (1207)

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.

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. Figure 
4-5 is a typical bearing with a setscrew-type locking 
de vice. The various locking devices can be clas si fi ed 
un der  ba sic  types:  ec cen tric locking type, concentric 
lock ing type, and Skwezloc type.

An eccentric self-locking collar is turned and driven 
with a punch in the direction of shaft rotation to lock 
the bear ing inner ring to the shaft. See Figure 4-7.

When the eccentric collar is engaged to the cam on the 
bearing inner ring and turned in di rec tion  of  ro ta tion,  it 
grips the shaft with a positive binding action. The collar 
is then locked in place with the setscrew provided in 
the collar.

The self-locking collar is placed on the shaft with its 
cam adjacent to the cam on the end of the bear ing’s wide 
inner ring. In this position, with collar and bear ing cams 
dis en gaged,  the  col lar’s bore is con cen tric with that of 
the bearing’s inner ring. The wide inner ring is loose 
on the shaft. By turning the collar in the direction of 
normal shaft ro ta tion, the eccentric re cessed cam will 
drop over and engage with the cor re spond ing  cam  on 
the bearing inner, causing it to grip the shaft tightly with 
a  pos i tive  binding  action.  See Fig ure 4-6 & 4-7. Make 
sure the two cams engage smoothly and the locking 
collar is down fl at against the shoul der of the inner ring. 
The wide inner ring is now locked to the shaft. Using 
a punch or similar tool in the drilled hole of the collar, 
tap the tool lightly to lock the collar in the di rec tion  of 
nor mal  shaft  rotation.

As a fi nal step, the setscrew is tightened. Torque per 
Table 4-2. It exerts a wedging action to hold the collar 
always in the engaged po si tion, even under shock and 
reversing loads.

To disassemble, loosen the setscrew and tap the collar 
in the direction opposite shaft ro ta tion.

LD06357

00418VIP

Seal

Set
Screws

Lube 
Fitting

Lock
Ring

Pillow
Block

Inner
Race

Outer
Race

RECESSED CAM OR SELF-

LOCKING COLLAR

SELF LOCKING COLLAR

CAM OR INNER RING

BALLS AND RACEWAY

INNER RING

OUTER RING

SEAL ASSEMBLY