Greenheck USGF (462077) - Manual (Page 7)

7 Model USGF Ultimate Steel Grease Fan
®
8. Always loosen tension enough to install belts without
stretching, see figure 15.
9. For units with two groove pulleys, adjust so the
tension is equal in both belts.
10. If adjustments are made, it is very important to check
the pulleys for proper alignment. Misaligned pulleys
lead to excessive belt wear vibration, noise and
power loss, see figure 16.
11. For all USGF units, belt tension can be adjusted
by loosening four fasteners on the drive frame,
see figure 17. The motor plate slides on the slotted
adjusting arms and drive frame angles in the same
manner.
12. Belt tension should be adjusted to allow 1/64 inch
(0.397 mm) of deflection per inch of belt span. For
example, a 15 inch (381 mm) belt span should have
15/64 inch (0.234 mm) (or about 1/4 inch (6 mm)) of
deflection with moderate thumb pressure at mid‑point
between pulleys, see figure 18.
13. The adjustable motor pulley is factory set for the
RPM specified. Speed can be increased by closing
or decreased by opening the adjustable motor
sheave. Two groove variable pitch pulleys must be
adjusted an equal number of turns open or closed.
14. Any increase in speed represents a substantial
increase in the horsepower required by the unit.
15. Motor amperage should always be checked to avoid
serious damage to the motor when speed is varied.
Figure 16
Do not force belt(s). Forcing the
belt(s) will break the cords and
cause belt failure
.
Belts
Figure 15
IMPORTANT
Over tightening will cause excessive bearing wear and
noise. Too little tension will cause slippage at startup
and uneven wear.
IMPORTANT
Adjust (tighten) belt tension after the first 24‑48 hours
of operation.
Fasteners
(4) *Fasteners
*Identical fasteners on
opposing side must also be
loosened.
Figure 17
WARNING
The fan has been checked for mechanical noises at the
factory prior to shipment. If mechanical noise should
develop, suggested corrective actions are offered in the
Troubleshooting section.
Clockwise
Airflow
Counterclockwise
Airflow
Wheel Rotation for all Models
All USGF fans
have clockwise
wheel rotation
when viewed
from top of fan.
Figure 13
Wheel Overlap Dimensions
Figure 14
G
Model
G Overlap
inches (mm)
USGF‑140 thru 160 1/4 (6)
USGF‑180 thru 200 1/2 (13)
Belt Span
Deflection = Belt Span
64
Clockwise
CORRECT WRONG WRONG WRONG
Deflection
Figure 18