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Page 6 F00633
ALIGNMENT
Drive belt can catch and trap clothing
or body. Belt guard must ALWAYS be in
place when pump is running. Belt guard is not shown for
pictorial clarity.
• Drive and pump shaft centerlines (A) must be parallel
as shown. Belt centerlines (B) must be straight as
shown.
• When installing belts, move the driver toward the
pump to allow belts to be placed on pulley. Then,
move the driver away from pump to obtain proper belt
tension as described below.
TENSION
• Multiple belt spans must be equal tension in all belts.
Proper belt tension varies with the size of belt being
used, however a general rule is:
Belts are properly tensioned when one belt can be
depressed one belt thickness at the center of the
span when pressing with thumb.
Another method is that a properly tensioned belt can
be rotated (twisted) one-quarter revolution at the
center of span.
NOTICE: Belts must be tight enough to prevent slip-
ping during operation. Loose belts result in early belt
failure and reduced performance. However, excessive
tightness of belts will result in overheating of the belts
and excessive bearing load in the pump and driver.
• Most Vee-belts will stretch slightly after initial
installation. After a short period of operation, re-
check belt tension and adjust as necessary.
Belt Drive
Installation
Alignment/Proper Belt Tension
A
A
B
B
B
B
A
A
Centerline
Centerline
Incorrect
Centerline - A of each shaft and pulley must
be parallel for proper alignment.
Incorrect
Centerline - B represents center of belt and
pulley.This centerline must be straight for
proper alignment.
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Slack should not be more
than one belt thickness.
Proper tension allows one-
quarter revolution of belt.
A
A
A-A
Center of span.
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