Greenheck Fan Fiberglass Centrifugal Fan 474051 - Manual (Page 7)

7 Model BCSW-FRP
Flexible Couplings (Arr. 8 Only)
Check for misalignment between the coupling halves.
Parallel and angular misalignment and separation gap
are illustrated below. Refer to coupling manufacturer’s
installation instructions for allowable misalignment
and separation gap tolerances. When correcting for
misalignment using shims, the shims should only be
located under the motor. Do not place shims under the
shaft bearings.
After aligning procedure, check for tightness of all
coupling component pieces and ensure that they are
clean from dirt and debris.
Parallel Misalignment
Angular Misalignment
Separation Gap
V-Belt Drives
The V-belt drive components, when supplied by
Greenheck Fan Corporation, have been carefully
selected for this unit’s specific operating condition.
CAUTION
Changing V-belt drive components could result in
unsafe operating conditions which may cause
personal injury or failure of the following
components:
1. Fan shaft
2. Fan wheel
3. Bearings
4. V-belt
5. Motor
FAN FAN
MOTOR MOTOR
Aligning sheaves with
a straight-edge
Improper sheave
alignment
Proper sheave
alignment
V-Belt Drive Installation
1. Remove the protective coating from the end of the
fan shaft and assure that it is free of nicks and burrs.
2. Check fan and motor shafts for parallel and angular
alignment.
3. Slide sheaves on shafts - do not drive sheaves on as
this may result in bearing damage.
4. Align fan and motor sheaves with a straight-edge or
string, and tighten.
5. Place belts over
sheaves. Do not pry or
force belts, as this could
result in damage to the
cords in the belts.
6. Adjust the tension until
the belts appear snug.
Run the unit for a few
minutes (see section
on unit start-up) and
allow the belts to seat
properly.
7. With the fan off, adjust the belt tension by moving
the motor base. (See belt tensioning procedures in
the maintenance section of this manual). When in
operation, the tight side of the belts should be in a
straight line from sheave to sheave with a slight bow
on the slack side.