Page 146 - 233423 - Exhaust Fans_Neat

MAINTENANCE AND REPAIR Lubrication should be done while the fan is running if
possible, using a high quality No. 2 lithium-base
Routine inspections and preventive maintenance grease. Apply with a handgun until a slight bead of
practices are an absolute must for trouble free grease is noticeable around the bearing. Stop
operation and to prolong the life of the unit. A lubrication when the bead is formed.
preventive maintenance schedule should be DO NOT OVER LUBRICATE!
developed and followed. Records of all maintenance
inspections and repairs should always be maintained. Use the following table as a general guide for
re-lubrication.
Inspection activities should include: Lubrication Guide
Use a No. 2 Lithium-base grease or equivalent
Inspection of all hardware - structural integrity of the
Hours Suggested Lubrication Period in Weeks
unit and its foundation - cleanliness of the wheel and
Run Per 251-500 501-720 751-1000 1001-1250
motor - bearing lubrication for fan and motor - as well Day 1-250 RPM RPM RPM RPM RPM
as the condition of the drive components / couplings.
Inspections should also include checking the unit for 8 12 12 10 7 5
excessive vibration and changes in sound.
16 12 7 5 4 2
CAUTION ELECTRICAL HAZZARD
24 10 5 2 2 1
Before attempting any repair work, be certain that
all power to the motor and electrical accessories Operating Temperature:
is turned off, and where possible, locked in the
OFF position. Abnormal bearing temperature may be the result of
improper lubrication. Normal operating temperature
BEARINGS: can range from “cool to warm to the touch” up to the
All bearing and wheel set screws should be checked point of being “too hot to touch for more than a few
and tightened, and then rechecked after the first 50 - seconds”. Normal surface temperatures with grease
100 hours of operation. If a torque wrench is available, present at the seals indicates “proper” lubrication of
use the following values. the bearings. Abnormally hot surface temperatures
with grease leakage indicates too much grease, while
Set Screw Diameter Min. Torque (in-lbs)
hot, with no grease showing, indicates too little grease.
1/4 73
NOTICE
5/16 139
3/8 251 Bearings of any unit that has been stored for any
period of time MUST be lubricated before startup
7/16 383
1/2 554 Bearing Replacement:
Wheel and shaft must be supported before
5/8 1214
dismantling is attempted. Remove drives, then loosen
and remove bearing bolts. Next, loosen the bearing
LUBRICATION: set screws on the bearing collars. Remove the
bearings from the shaft only after insuring that the shaft
Normal Operation: and wheel are properly supported.
Bearings are pre-greased from the factory and ready
to run. The bearings do however, require periodic Shaft Replacement:
re-lubrication. When determining a lubrication After following the steps listed for removal of the
schedule, it is recommended that more frequent bearings, loosen the set screws in the wheel hub. With
inspections be made for high speed and high heat the wheel securely blocked, pull the shaft from the
applications. Another thing to consider, is that adding wheel.
small amounts of grease more frequently is preferred
over adding larger amounts less frequently.
PBOIPM-V05
REVISED 12/2018