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SETTINGS AND ADJUSTMENTS
SECTION 4-19
Drive Belt Replacement Or Adjustment
CHECK THE PULLEY ALIGNMENT
Tug outward on the pulleys to verify that they are tight on
their shafts.
Check the pulley alignment by holding a straight edge
against the edge of the large pulley and verifying that it is
aligned with the edge of the small pulley. If the edges of
the pulleys do not align, perhaps because the small pulley
doesn't have as many grooves, use a tape to measure from
the straight edge to the belt on each pulley.
MEASURE THE BELT SPAN
Measure the belt span between the contact points on the large and
small pulleys as shown.
CALCULATE THE ALLOWABLE BELT DEFLECTION
The allowable belt deflection is obtained as follows.
Allowable belt deflection =Belt Span in inches (or mm) divided by 64
Another way to show that relationship: allowable belt deflection = Belt Span (in inches or mm}
64
MEASURE THE DEFLECTION FORCE
A gage to measure belt tension greatly facilitates this
measurement. You may purchase one from Cumberland
Engineering, or from the belt manufacturer.
NOTE: Check the instructions supplied with the belt tension gage
for proper setting of the scales.
Use the belt gage to measure the force required to deflect
the belt to the allowable dimension