12
Sheaves must be aligned so that when a straight edge is held across the face of the
driven and driver sheaves there is less than .025” gap between the straight edge
and the face of the sheaves. Shafts should be parallel.
Always use a matched set of new belts purchased from manufacturer.
Use only the same section of belt (Example: 3VX) that the sheave was designed
for.
Slack off sheaves until belts can be placed in grooves by hand – without forcing.
Never use a screwdriver, crowbar or other implement. Do not install on the same
sheave some belts with slack side on tope and others with slack side below. Have
slack in all belts on the same side.
Adjust take-up until belts are snug and then tension the drive properly. The
following tensioning information are general guidelines for equipment supplied by
the factory. For specific tensioning data, consult the factory or belt manufacturer.
Measure the span (distance between centerlines of sheaves). The deflection at
mid-span should be 1/64” per in of span. (i.e., for a span of 24”, the deflection is
3/8”). Using a V-belt tension tester, the mid-span face per belt after break-in should
be:
Motor HP/Belt
Force (lb)
3 – 5
2 – 3
6 – 8
3 – 4
9 – 10
3-1/2 – 5
25
8 - 12
Check belt tension and alignment several times during the first few days of operation
with new belts.
Never use a belt dressing.
WARNING
ALL GUARD AND PROTECTIVE DEVICES MUST BE INSTALLED BEFORE THE
PUMP IS STARTED. CONTACT WITH UNGUARDED BELTS, SHEAVES, OR
COUPLINGS COULD RESULT IN INJURY.
