IM-995
Installation, Operation & Maintenance Manual
14
Drive Mounting
(refer to safety section)
1.
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
the belt cords. Tighten the belts to the proper tension. Ideal
tension is just enough tension so that the belts do not slip
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
Placing fan sheave on motor can overspeed impeller and cause
structural failure.
CAUTION
WARNING
When working around belts and pulleys, keep hands away from
pinch points.
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Sheave Installation video
Twin City Fan
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