Torit Backward Inclined Fan, TBI-3 through 30
12
Motor Maintenance
TBI Fans typically use motors with greaseable bearings,
but other types of motors may have been selected for
your fan.
Side Plate Clearance
TBI
“A” Dimension (inches)
Size
60 hz
50 Hz
3
1-1/4
1-1/4
5
7/8
2-1/4
7.5
7/8
2-3/4
10
1/2
3-1/4
15
1-1/8
3/4
20
1-5/16
2-3/16
25
2-7/16
2-7/16
30
2-11/32
1-5/16
Tolerance ± 1/8”
Grease Motors
Use the following steps for greaseable motors only:
1. Inspect the motor at approximately every 500 hours
of operation or every 3 months, whichever occurs
first.
2. Keep the motor clean and the ventilation openings
clear. If the motor is not properly ventilated
overheating can occur.
3. Use an electrical insulation tester to periodically
ensure that the integrity of the winding insulation has
been maintained. Investigate any significant drop in
resistance.
4. Grease the motor bearings using a high grade
bearing grease. For standard service conditions
ExxonMobil Polyrex™ EM grease is recommended.
Under standard conditions, grease every 5,500 hours.
In severe dirt and abrasive dust conditions, grease
every 2750 hours. Under extreme conditions, such
as an environment with iron dust, grease every 550
hours.
Wheel Balance
Airstreams containing particulate or chemicals can
cause abrasion or corrosion of the fan parts. This is
often uneven and can lead to wheel imbalance over time.
When such wear is discovered, a decision must be made
to rebalance or replace the wheel.
The soundness of all parts should be determined making
sure there is no hidden structural damage. The airstream
components should also be cleaned to remove any
build-up of foreign material. Specialized equipment can
be used to rebalance a cleaned wheel that is considered
structurally sound.
Balance weights should be rigidly attached at a point
that will not interfere with the housing nor disrupt airflow.
Troubleshooting Guidelines
Use current safety practices when investigating fan or
system performance problems. General safe practices
and performance troubleshooting guidelines can be
found in AMCA Publications 410 and 202, respectively.
Fan application and field measurement procedures can
be found in AMCA Publications 201 and 203.
ExxonMobil Polyrex™ EM is a trademark of Exxon Mobil Corporation
