Grain Systems Bucket Elevtors, Conveyors, Series II Sweeps PNEG-1204 - Manual (Page 23)

18 PNEG-1204 Enclosed Belt Conveyors
Motor Assembly
13. Assemble the V-belt driven sheave to the
input shaft of the shaft mount reducer. Insert
the bushing into sheave hub. Match holes in
bushing and hub (not threads). Put screws
into holes that are farthest apart. Slip entire
unit with key onto shaft. Align the driver and
driven sheaves and tighten the retaining
screws. During tightening, it is possible for
the sheave to move out of alignment or
become out of square. For maximum V-Belt
life, the driven sheave should remain both
perpendicular to the drive shaft and aligned
with the drive sheave. Slip the V-belts over
both the driver and driven sheaves.
14. Adjustment of V-belt tension is achieved by
tightening the hex nuts located on the four (4)
jackscrews of the motor base. Adjust motor
base equally at all four jackscrews to
maintain shaft alignment. Belts are
designed to fit loose upon installation. When
the V-belt tension is correct, tighten the top
nut on the jackscrews to lock the motor base
in position. Proper tension is 1/64" of
deflection per one (1") inch of sheave centers
on one side of belt, centered between
sheaves. (See diagram below.)
V-Belt Adjustment
Too much tension shortens belt life.
Check belt tension frequently during
the first 24-48 hours of operation.
Sheaves and Belts
Sample Deflection Problem:
3-1/2' Span = 21/32" of Deflection (Approximately 11/16")
1. 3-1/2' = 42"
2. 1/64" = .015625"
3. 42" x .015625" = .65625"
4. .65625" = 21/32" of Deflection