OMM-11-0211-page 5
D. Set Screw and Taper-lock Bushing Torque Values:
All blower wheel set screws are tightened to the proper torque prior to shipment. Some wheels may have taper-lock hubs
and split, taper-lock bushings to secure the wheel to the blower shaft.
NOTE:
Check all set screw or taper-lock bushing torques. Forces encountered during shipment, handling, rigging and tem-
perature can affect factory settings. For correct torque values, see
Tables 2
and
3
below.
Set screws should NEVER be used more than once. If the set screws are loosened, they MUST be replaced.
Use only knurled, cup-point, set screws with a nylon locking patch.
CAUTION
E. Blower Bearings:
The blower bearings have set screws to lock the bearings onto the blower shaft. The set screws should be tightened to the
torque levels as shown in
Table 2
above. Blower bearings should be lubricated in accordance with the bearing manufactur-
er’s recommendation and with the same type of grease.
See chart under B-2 on page 11. Bearings are pre-lubricated at
the factory.
The blower shaft/bearing access hole covers and belt guard should only be opened or removed for inspection
before startup or inspection or maintenance
AFTER
the power to the motor has been turned off and locked out.
The
shaft/bearing access covers and belt guard MUST be replaced before power to the motor is turned back on.
F. V-Belt Drives:
If Cincinnati Fan supplied the belts and sheaves (drives package), they were carefully selected for the specific operating
conditions supplied to us by the customer.
If the user is supplying the sheaves and/or belts, it is their responsibility to make the correct component selections for the
specific operating conditions. Their selection must also
NOT ALLOW
the blower to exceed its
maximum safe speed or
hub load.
If you do not know the maximum safe speed or hub load for this blower,
DO NOT
make any drive selection
without first consulting Cincinnati Fan or our sales office for your area.
“Timing” belts should never be used on blow-
ers.
If you are replacing belts and/or sheaves, checking belt tension or proper alignment,
see below and page 6
. Sheave
set screws or taper-lock bushing bolts should be tightened to the torque values as indicated in
Tables 1
and/or
2
above.
G. V-Belt Drive Installation:
Power to the motor must be turned off and locked out, BEFORE inspecting, installing or servicing any compo-
nents of the drives. READ THE BELOW AND FOLLOW ALL THE STEPS ON PAGE 6.
If you are installing any new belts, inspect and replace any worn or damaged sheaves, bearings or shafts while the power is
turned off and locked out.
This will eliminate additional down time later to replace any other parts that were worn or defec-
tive.
SET SCREW TORQUE VALUES
TORQUE VALUES FOR
TAPER-LOCK BUSHINGS
Diameter & Number
of Treads/Inch
Hex Wrence Size
(Across Flats)
Required Torque
(Inch Pounds)
1/4-20
5/16-18
3/8-16
7/16-14
1/2-13
5/8-11
1/8”
5/32”
3/16”
7/32”
1/4”
5/16”
65
165
228
348
504
1104
Taper-lock
Bushing Size
Required Torque
(Inch Pounds)
H
B
P
Q
R
95
192
192
350
350
Table 3
Table 2
Changing any of the v-belt drive component selections, supplied with the blower, could result in unsafe
operating conditions which could cause equipment failure, personal injury and death.
DANGER
If you are installing a complete set of new drives, the most
critical steps of the installation are alignment of the sheaves
and belt tension.
Misaligned sheaves and/or improper
belt tension will cause excessive fan vibration and
result in premature belt and /or bearing failure.
The blower and motor shafts must be parallel and the
sheaves must be in line with each other. See
Fig. 2
on the
right:
For complete drive installation
instructions, please see these
websites:
www.emerson-ept.com/catalogs/instshts/browning/form5453.pdf
OR
www.maskapulleys.com/images/produit/Product%20Training_jan09.1.pdf
Fig. 2
Shafts not parallel
Sheaves not aligned
Proper alignment