Greenheck BDF (458341) - Manual (Page 6)

Belt Drive Duct Fan 6
®
PROBLEM CAUSE CORRECTIVE ACTION
Excessive
noise or
vibration
Wheel unbalance
Clean all dirt off wheel. Check wheel balance, rebalance in
place if necessary.
Bad bearings Replace.
Belts too tight or too loose Adjust tension, See Figure 7.
Wheel improperly aligned and
rubbing
Center wheel on inlet.
Loose drive or motor pulleys Align and tighten. See “Pre-Startup Checks”, pages 4-5.
Foreign objects in wheel or housing Remove objects, check for damage or unbalance.
Reduced
airflow
System resistance too high
Check system. Proper operation of backdraft or control
dampers, obstruction in ductwork, clean dirty filters.
Unit running backwards Correct as shown in Figure 4.
Excessive dirt buildup on wheels Clean wheel.
Improper wheel alignment Center wheel on inlets.
Table 1: Suggested Fan Bearing Greasing Intervals
Interval
(months)
Type of Service
1 to 3
Heavy duty in dirty, dusty locations; high ambient
temperatures; moisture laden atmosphere; vibration.
3 to 6
12 to 24 hours per day, heavy duty, or if moisture is
present
6 to 12
8 to 16 hours per day in clean, relatively dry
atmosphere
12 to 18 Infrequent operation or light duty in clean atmosphere
Table 2: Grease Manufacturers
Manufacturer Grease (NLGI #2)
U.S. Electric Motors Grease No. 83343
Chevron U.S.A. Inc Chevron SRI Grease #2
Mobil Oil Corporation
Mobilith
Mobil 532
Texaco, Inc.
Premium BRB #2
Texaco Multifak #2
Amoco Oil Co. Rykon Premium #2
Exxon Unirex N2
Shell B Shell Alvania #2
Recommended Relubrication Frequency
in Months
NOTE: If unusual environment conditions exist (extreme
temperature, moisture or contaminants) more frequent
lubrication is required.
A good quality lithium base grease, conforming to NLGI
Grade 2 consistency, such as those listed here may be
used.
Belt/Bearing Maintenance
1. Belts tend to stretch after a period of time. They
should be checked periodically for wear and
tightness. When replacing belts, use the same type
as supplied with the unit.
2. Matched belts should always be used on units with
multi-groove pulleys.
3. For belt replacement, loosen the tensioning device
enough to allow removal of the belt by hand. Do not
force belts on or off. This may cause cords to break,
leading to premature belt failure.
4. Once installed, adjust belts as shown in “Pre-Startup
Checks.”
5. Shaft bearings can be classified in two groups:
relubricating and non-relubricating. Bearings on sizes
80 through 180 are factory lubricated and require
no further lubrication under normal use (between
-20° and 180°F (-29°and 82°C) in a relatively clean
environment. Bearings on size 200 are relubricatable.
These bearings will require frequent lubrication.
Caution should be employed to prevent overpacking
or contamination.
6. Grease fittings should be wiped clean. The unit
should be in operation while lubricating. Extreme
care should be used around moving parts.
7. Grease should be pumped in very slowly until a slight
bead forms around the seal. A high grade lithium
base grease should be used.
WARNING
Before taking any corrective action, make certain unit
is not capable of operation during repairs.
AVERTISSEMENT
Avant d’entreprendre toute action corrective, s’assurer
que l’appareil ne pourra pas fonctionner durant les
réparations.
Troubleshooting