YORK INTERNATIONAL
46
REMOVAL AND INSTALLATION OF COMPONENTS
Disconnect or disable electric motor
and lock out.
Forward Curved Fans
Fan variations are shown in Figure
39.
The forward curved fan wheel must be removed through
the fan discharge opening. The location of other clamps,
fan wheel, and shaft must be marked so each of these
components can be reassembled in the same location.
See Figure 46. This will preserve the balance of the
rotating assembly. Proceed with the following steps:
1. Disconnect all duct work or guards attached to the
blower housing to permit unobstructed access.
2. Remove the cut off plate attached at the discharge
or blast area of the blower housing.
3. Thoroughly clean the shaft of all grease and rust
inhibitor. Be careful not to contaminate the bearing
grease. Use emery cloth to remove all rust or the
wheel may become “locked” to the shaft.
4. Loosen and remove set screws on both bearing lock-
ing collars. Inspect and, if necessary, replace.
5. Loosen and remove set screws from both sides of
the wheel hub. Inspect and, if necessary, replace.
6. Using a rubber mallet or brass bar, slowly drive the
shaft in one direction until the set screw marks on
the shaft are fully exposed. File the marks com-
pletely smooth. Drive the shaft in the opposite di-
rection and file smooth the set screw marks. Con-
tinue to clean the shaft of all dirt and residuals.
7. To remove the key, use a rubber mallet or brass bar
to drive the shaft and wheel in one direction. Drive
the key in the opposite direction using a nail set or
smaller size key stock until the key is completely
free of the wheel. Be sure that key does not get
bent by allowing it to ride up the key way edge.
The slightest bend will prevent quick assembly.
Should this occur, replace the key stock.
8. Remove the shaft, supporting the weight of the
wheel, particularly for larger diameter wheels. Do
not allow the weight of the shaft to be supported by
one bearing as you disassemble.
9. Remove the wheel through the discharge or outlet
area of the blower housing.
10. Reassemble in reverse order, centering the wheel
between the edges of the inlet venturi. If bearings
were removed or replaced, be sure to reuse any
shim stock found between the mounting support/
plate and bearing housings.
11. Torque all hardware.
Refer to AMCA Publication 410-90
“Recommended Safety Practices” for
users and installers of industrial and
commercial fans.
These procedures must be followed
to protect personnel and include
isolating the fan from any electrical
supply.
Maintenance should only be per-
formed by experienced and trained
personnel.
FIG. 45 –
FC FAN SHAFT AND WHEEL MARKING
LD06355
Maintenance
