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Models NYD & NYB • Tamper-Resistant Centrifugal Roof Exhaust Fans
®
Table 3: 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
Table 2: 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
Recommended Relubrication
Frequency in Months
NOTE: If unusual environment conditions exist more
frequent lubrication is required (extreme
temperature, moisture or contaminants).
A good quality lithium base grease,
conforming to NLGI Grade 2 consistency,
such as those listed here may be used.
Troubleshooting
WARNING: Before taking any corrective action, make certain unit is not capable of operation during
repairs.
PROBLEM CAUSE CORRECTIVE ACTION
Excessive Noise
or Vibration
Bad Bearings Replace.
Wheel unbalance
Clean and remove all dirt buildup off wheel. Check wheel
balance, rebalance in place if necessary.
Belts too tight or too loose Adjust tension, see figure 7.
Wheel improperly aligned and
rubbing
Center wheel on inlet, see figure 2.
Loose drive or motor pulleys Align and tighten. See “Pre-Starting Checks”, see page 3-4.
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, etc.
Unit running backwards Correct as shown in figure 3.
Excessive dirt buildup on wheels Clean wheel.
Improper wheel alignment Center wheel on inlets, see Pre-Starting checks and figure 2.