BELT TENSION
Belt tension is highly important. When in operation both tight and slack strands of the belt
should be in a straight line from sheave to sheave; a very small sag or bow could be
acceptable at the slack strand. Check belt tension after eight (8) hours operation, followed
by periodic inspections to be sure belt is under sufficient tension and that belt is not
slipping or jumping from the groove.
Proper Tension is found when a
force of one pound is applied to the
center of the belt span, and a
deflection between .18 (minimum)
and .25 (maximum) inches is
present. The maximum value is
indicated for “New Belt” and new
belt should be tensioned at this
value to allow for expected tension
loss.
Used
belts
should
be
maintained at the minimum value of
deflection. For reference please see
right diagram.
BELT DEFLECTION
An excessive belt tension could produce non-desirable effects, as shorter life of bearings
(engine and blower), power reduction, higher temperature, etc.
Do not install a new belt on worn sheaves. Such sheaves should be replaced to insure a
proper fit of the belt in the grooves and prevent slippage and premature belt wear.
If sheave(s) change is required, they are sold already assembled with the shaft (for the
blower) or on the shaft adapter (for the engine). Under normal conditions, the sheaves will
last hundreds of hours before a change could be required.
Do not force belt over sheave grooves. Slack off drive for easy mounting of belt. Adjust
drive and check that belt operates free and clear of all obstructions.
Keep belt clean. Do not use belt dressing. If belt slips, clean and readjust belt tension.
Keep extra belts stored in a cool, dark and dry place.
CAUTION
Because of the possible danger to person(s) with accidents which may result in
the use of this belt transmission, is important to install the belt guard before to run
the engine. Do not use the machine if the belt guard is not installed.
27
DEFLECTION
BELT SPAN
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