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Tension the Fan Belt
Notice
Belt Over-Tension!
Over-tensioning the belt could result in equipment
damage as it reduces fan and motor bearing life,
accelerates belt wear, and can cause shaft failure.
Notice
Belt Under-Tension!
Under tensioning the belt could result in belt failure.
Belts should not squeal at startup. Recheck belt tension
after 8 hours, 24 hours, and 100 hours of operation and
monthly thereafter.
Proper belt tension is required to ensure maximum bearing
and drive component life and is based on motor horsepower
requirement. A label located on the bearing support on the
drive side of the unit lists all drive parts, the proper belt tension,
and deflection for that tension for the specific drive
If the drive is changed from the original, proper belt tension can
be estimated using
Table
16.
The correct operation tension for a V-belt drive is the lowest
tension at which the belts will not slip under the peak load
conditions. It may be necessary, however, to increase the
tension of some drives to reduce excessive belt flopping or to
reduce excessive startup squealing.
Figure 63. Tension drive belt label
V-BELT DRIVE KIT
PURCHASE ORD. NUMBER B24597-061 H5D073B A
CUSTOMER'S KIT # H5D073B A-012-0400
MTR HP.= 10.0
FAN RPM = 1458 CD = 9.4 AT 3.00 TRN OPN
TENSION INFO - 3.86 LB., 0.14 IN.
DRIVE'S BELTS - B40
MOTOR SHEAVE - 2VP75X 1 3/8
MOTOR BUSHING - NONE REQUIRED
FAN SHEAVE - 2B5V80
FAN BUSHING - B 1 7/16
Check the fan belt tension at least three times during the first
days of operation because there is a rapid decrease in tension
until the belt settles in. To measure belt tension, use a belt
tensiometer (see
Figure
64). Determine actual deflection by
depressing one belt with the belt tensiometer and measuring
the deflection relative to the other belts or to belt line (see
Figure
65). Adjust the belt tension to the correct pounds force
and tighten all bolts to the proper torque. See
62
(Figure
1627373
MODULE 0400
Table 19, p.
Figure 64. Belt tensioner
Large O-ring
63).
Figure 65. Belt tension measurement
Belt Span
Deflection =
72.
Force scale
Small O-ring
Span scale
64
Belt Span
CLCH-SVX009L-EN
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