IM-995
Installation, Operation & Maintenance Manual
14
Drive Mounting
(refer to safety section)
Mount drives as follows:
1. Slip (do not pound) proper sheave onto corresponding
shaft. Most drives utilize tapered bushings. Draw the
bushing up evenly tightening in steps. To minimize bearing
loading, mount sheaves as close to bearings as possible. It
is preferable to use alignment tools that align the grooves
of the sheave.
2. Laser alignment is common. The mechanic must be familiar
with the alignment tool he is using. Otherwise, align
sheaves with straightedge extended along sheaves, just
making contact in two places on outside perimeters of
both sheaves. This “four-point” alignment may also be
checked with a string tied to the shaft behind one of the
sheaves. The string is then pulled taut over the faces of the
sheaves to check the alignment at the four points at the
outside perimeters. Each sheave should be rotated about
one-half revolution during this check to look for excessive
runout or a bent shaft. Unless there is a bent shaft, runout
can be corrected by adjustments to the bolt torque of the
taper bushing.
3. Install and tighten the belts. Run the drive for a few
minutes to seat the belts. When fitting the belts, slide
the motor in to fit the belts on. Do not use a pry bar, as
this may damage the belt cords. Tighten the belts to the
proper tension. Ideal tension is just enough tension so
that the belts do not slip under peak load or acceleration.
Many drives are provided with tensioning data which
identifies the load to apply at the center of the span and
the allowable deflection from this force. A belt tension
gauge is recommended for precise tensioning.
4. After initial installation of belts, recheck belt tension again
after a few days of operation to adjust belt tension. (New
belts require a break-in period of operation.)
Placing fan sheave on motor can overspeed wheel and cause
structural failure.
CAUTION
WARNING
When working around belts and pulleys, keep hands away
from pinch points.
Click To View Our
Sheave Installation video
Twin City Fan
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