– 27 –
24. Monitor for excessive heat or vibration during
operation.
25. All bearings are pre-lubricated and should
not require greasing. Refer to the bearing
manufacturer’s instructions or the unit
manufacturer’s instructions for proper bearing
maintenance.
Note: Drive side Sleevlock bearing installation
(SPB-2115-C2).
1. Mount all the bearings and leave all the bolts
and setscrews loose
2. Tighten setscrews on Sleevlock bearing to
the tightening pattern as described in the
installation sheet that comes with the bearing
to a fi nal 65 inch lbs while rotating the shaft.
Check to make sure the insert of the bearing is
centered in the bearing housing and then bolt
bearing down.
3. Tighten down the bolts and setscrews on
the remaining bearings per installation sheet
starting from the end bearing back toward’s the
Sleevlock while rotating the shaft.
3. Dampers – Dampers should be inspected monthly
(daily in icy weather)
for securely fastened linkages,
and smooth operation. If dampers are binding or
excessively noisy, then lubrication may be required.
Place one drop of #20 wt. machine oil, silicone spray,
graphite or equal on each blade bearing, and linkage
ball joint. Do not over lubricate, and wipe any excess
from the area. Be sure to note that dampers over 49
inches long have intermediate bearings which require
lubrication.
C. Air Filters
All
fi
lter banks should be equipped with a manometer
or differential pressure switch to indicate when the
fi
lters are dirty. Filters should be replaced when
the differential pressure across them reaches the
manufacturer’s recommended
fi
nal value. Dirty
fi
lter
elements should be replaced with a clean element of
the same type and size. In addition, the factory not
only suggests, but insists, that air
fi
lters be
checked
every 30 days
and replaced with new
fi
lters (throw-
away type) or cleaned (washable type) as required.
Cleanable
fi
lters should be given new application of
fi
lter coating after washing to maintain optimum
fi
lter
performance.
The frequency of cleaning and replacing air
fi
lters
applies twelve months of the year,
where blowers
are used for ventilation and heating.
D. Belt Tensions and Adjustments
Belt tension is adjusted during the initial run-in and test
periods at the factory. However, the belts are run as
slack as possible to prevent excessive damage to the
bearings, yet tight enough to prevent slippage.
It is necessary, therefore, to tighten all belts during the
fi
rst few months of operation, and to
check for proper
tension weekly during
the
fi rst 60 days,
after which
30-day check intervals are suf
fi
cient.
NOTE: Turn off all power to the equipment before
checking belt tensions.
CAUTION: Do not attempt to tighten any belt or belts
by changing the pitch of an adjustable pulley, as this
will change the speed of a driven pulley, causing the
unit to be rendered OUT OF AIR BALANCE. Do not
overtighten belts.
Suggested Belt Tension Method
1. Check tension frequently during the
fi
rst 24-48
hours of run-in operation. Ideal tension is the
lowest tension at which the belt will not slip under
peak load conditions. Over tensioning shortens belt
and bearing life.
2. To properly tension a conventional V-belt drive use
the following procedure:
a. Measure the span length.
b. At the center of the span, apply a force perpen-
dicular to the span to de
fl
ect the belt 1/64 inch
for every inch of span length. For example, for a
40 inch span, apply a force that will de
fl
ect the
belt 40/64 or 5/8 of an inch.
c. Compare the force you have applied with the
values given in the table below. If the force is
between the values for normal tension and 1-1/2
times normal tension, the belt tension should be
satisfactory. If the belt tension is not within this
range, it can be adjusted by loosening the motor
mounting bolts, and adjusting the position of the
motor along its base.
B Section
small
Pounds
pulley
Pounds Force
for
diameter
Belt Force
for
1
1
/
2
times
range in
Manufacturer
Normal
Normal
Inches
&
Type
Belt
Tension Tension
3.4-4.2
Gates
Hi-Power
4.4
6.6
4.4-4.6
Gates
Hi-Power
4.9
7.4
5.8-8.6
Gates
Hi-Power
5.8
8.7
Note: For recommendation of other types of belts,
consult respective manufacturers.
E. Optional Coils And Related Items
1. Coils – Coil surfaces must be kept clean of dirt
and lint in order to operate at rated ef
fi
ciency.
Coils should be inspected on a regular basis and
cleaned as required.
