Chapter 5: Maintenance 24 of 37
1. Verify that the alignment of the pulley is correct. Utilizing a straightedge of
sufficient length to span from one pulley to the other, place it along the sides
of both pulleys. The entire face of each pulley should fully contact the
straightedge.
2. Measure the belt SPAN with a measuring tape. Record this dimension in
your note book.
3. Using the deflection tester, apply a perpendicular force at the midpoint of any
one of the belts to deflect the belt 1/64th of an inch.
4. Calculate the deflection force:
FORCE[Lb]= SPAN[IN] X (1/64)[Lb/IN]
5. Identify the belt type and measure the small sheave diameter. Look up the
proper model belt deflection force table and find out what the force is
supposed to be.
6. The motor position should be adjusted until the actual deflection force
matches the force listed in the table.
7. In no case should the belts be over tensioned, as this can significantly reduce
belt and/or bearing life
