Maintenance
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OAU-SVX005C-EN
Lubrication of motors should be done while the motor is
warm and at a standstill. Remove and clean all grease
plugs and insert a grease fitting in the upper hole in the
motor casing at each end (viewed as if motor were sitting
horizontally on its base). There may be one or two plugs in
each end casing of the motor. Add a small amount of a
clean, good grade ball bearing grease (such as Exxon
®
Polyrex™ EM or equal, with a low pressure grease gun.
Run the motor five minutes before removing the grease
fittings and replacing the plugs.
Note:
On totally enclosed fan cooled (TEFC) motors, the
rear end fan housing must be removed to expose
the grease plugs.
Pillow Block Bearings
Pillow block bearings are used on supply blower(s).
Bearings have been pre-lubricated with a number 2
lithium based greased. Re-lubrication should be done with
a similar grease using a low pressure grease gun. Wipe all
grease fittings clean before adding grease. Grease should
be added slowly, in small amounts at frequent intervals
while the shaft is being manually rotated.
A slight showing of grease at the seals with accompanying
normal bearing temperature indicates proper lubrication.
Normal temperature can range from “cool” to “hot to the
touch” depending on size, speed and surrounding
conditions. Excessive bearing temperature indicates
faulty lubrication. An insufficient amount of grease is
suggested by a bearing showing no grease at the seals,
and a higher than normal temperature and noise level.
Excessive leakage of grease at the seals, and a high
operating temperature suggest too much grease.
Important:
Grease twin blower inner bearing on same
schedule as two outer bearings.
Frequency of Lubrication
Frequency of lubrication depends upon operating
conditions. The bearing operating temperature is the best
index for determining a re-lubrication schedule.
gives the frequency of re-lubrication based upon
continuous operation for various operating temperatures
and can be used as a satisfactory guide for determining
when all ball and roller bearings should be lubricated.
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 weight machine oil on each blade bearing, and linkage
ball joint. Do not over lubricate, and wipe any excess from
the area. Ensure to note that dampers over 49 inches long
have intermediate bearings which require lubrication.
Air Filters
All filter banks should be equipped with a manometer or
differential pressure switch to indicate when the filters are
dirty. Filters should be replaced when the differential
pressure across them reaches the manufacturer’s
recommended final value. Dirty filter elements should be
replaced with a clean element of the same type and size. In
addition, it is strongly advised that the air filters be
checked every 30 days and replaced with new filters
(throw-away type) or cleaned (washable type) as required.
Cleanable filters should be given new application of filter
coating after washing to maintain optimum performance.
NOTICE:
Bearing Overheating!
Excess grease could result in overheating the bearings
which could result in equipment damage.
Table 9.
Frequency of lubrication
Speed
(rpm)
Temp.
(°F)
Cleanliness
Interval
100
Up to 125
Clean
6 Months
500
Up to 150
Clean
2 Months
1000
Up to 210
Clean
2 Weeks
1500
Over 150
Clean
Weekly
Any Speed
Up to 150
Dirty
1 Week
Any Speed
Over 150
Dirty
Daily to 1 Week
Any Speed
Any Temp.
Very Dirty
Daily to 1 Week
Any Speed
Any Temp.
Extreme Conditions
Daily to 1 Week
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
AVERTISSEMENT
Risque d’électrocution!
Le non-respect de cette consigne peut entraîner des
blessures graves, voire mortelles. Avant toute
intervention, coupez l’alimentation électrique, y
compris aux sectionneurs à distance. Suivez
scrupuleusement les procédures de verrouillage/mise
hors service préconisées pour empêcher tout
rétablissement accidentel de l’alimentation électrique.