Quincy QGB Series Instruction Manual page 46

Section VI - Servicing
Parallel (Shafts are parallel; sheaves not in
line)
) To check, use a straight edge or
string near sheave centers.
2) To correct, loosen sheave and
relocate on shaft until all four points
touch straightedge. Tighten sheave in
position. IMPORTANT: Sheave should
be mounted as close to bearing as
possible to reduce overhung load
on bearing. Relocate equipment, if
necessary.
notiCe!
Never "pry" the belts into the
sheave grooves. This can damage
the belt cords and lead to belt
turnover, short life or actual
breakage. Without exception,
the most important factor in the
successful operation of a v-belt
drive is proper belt tensioning.
Too little tension results in
slippage, causing rapid belt and
sheave wear. Too much tension
can result in excessive stress on
belts, bearings and shafts.
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Laser Alignment Procedure
(Recommended)
) Attach a laser alignment block to
each sheave.
2) Turn on the alignment lasers on each
block.
Avoid laser contact with the eyes.
3) Check alignment. The figure
below shows how to read the laser
alignment tool. The sum of the drive
and driven misalignment should be
no greater than two marks.
Quincy Compressor-QGB
Caution!
™