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

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Sterling D48160s manual Check the Pulley Alignment, Measure the Belt Span, Calculate the Allowable Belt Deflection