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CHECK FOR WEAR
• Inspect belts, sheaves and/or sprockets for
wear. See illustrations to assist with
inspection. For details on replacing belts, see
Servicing Belts section of this manual.
• V-Belt-drive efficiency depends on full
contact between the belt and the sheave
walls. As a sheave wears, the walls
where the belt should ride go from
being flat to being "dished" or concave.
Therefore, worn sheaves dramatically
reduce the efficiency of the drive.
VISUAL CUES. The worst sheave
wear will be a highly-polished track in
the sheave wall, deep enough that you
can feel it with your finger. Lesser (but
no less important) wear may be harder to
spot with just your eyes. A sheave gauge,
usually consisting of plastic wedges
shaped like a new belt, can be inserted
into the groove. If the gauge doesn't fit
squarely into the groove and you can see
daylight around the edges, your sheave is
worn and must be replaced.
• Inspect sprocket grooves for unusual or
excessive wear. Check for excessive wear
by both visually inspecting the grooves and
by running your finger along the sprocket
grooves. If you can feel or see noticeable
wear, the sprockets are worn and should be
replaced.
!
WARNING
Severely worn surfaces on sheave or sprocket
faces may become very sharp. Wear gloves
for protection from nicks or sharp surfaces.
SP6016
The sheave should be replaced when more
than 1/32-inch gap is visible past the
appropriate gauge or straight edge.
MACHINE MAINTENANCE
30
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