Twin City IM-4050
7
OIL TUBES
Figure 10. Sleeve Bearing Motor Oil Tube Location
Storage
If fans are stored for any length of time, they should be stored in a clean, dry location to prevent rust and corro-
sion. Outdoor storage is not recommended. When outdoor storage is necessary, fans should be protected from the
elements as completely as possible. Cover the fan inlet and outlet and keep motors dry and clean.
For extended storage (more than 3 months) motor shafts and bearings should be rotated monthly. If stored longer
than 6 months, bearing grease in motor and fan should be purged and replaced with compatible grease. Belts should
be rechecked for proper tension. Storage records should be kept to assure proper maintenance. The factory can
advise warranty centers to provide motor and bearing service if needed.
Table 5. Suggested Fan Bearing Greasing Intervals
INTERVAL
TYPE OF SERVICE
(MONTHS)
12 to 18
Infrequent operation or light duty in clean atmosphere.
6 to 12
8 to 16 hrs./day in clean, relatively dry atmosphere.
3 to 6
12 to 24 hrs./day, heavy duty, or if moisture is present.
1 to 3
Heavy duty in dirty, dusty locations; high ambient
temperatures; moisture laden atmosphere; vibration.
Table 6. Grease Manufacturers
MANUFACTURER
GREASE (NLGI #2)
Shell
Gadus S2 V100 2 or equivalent
Exxon/Mobil
Ronex MP
12. The standard pillow block bearings on belt driven
ventilators are factory lubricated and are provided with
external grease fittings. Lubrication annually is recom-
mended, or more frequently if needed (see Table 5).
It is recommended to add fresh grease at start-
up, but do not over-grease. Use only 1 or 2 shots
of a recommended lubricant with a hand gun in
most cases (see Table 6). Maximum hand gun rating
40 P.S.I. Rotate bearings during lubrication where
good safety practice permits.
CAUTION:
Greases of different soap bases
(lithium, sodium, etc.) may not be compatible when
mixed. Prevent such intermixing by completely purg-
ing the bearing of old greases.
The most frequent causes of bearing failure are
not greasing often enough, using an excessive
quantity of grease, or using incompatible greases.
Excessive vibration, especially if the bearing is not
rotating, will also cause bearings to fail. Bearings
must also be protected from water and moisture to
avoid internal corrosion.
13. During the first few months of operation it is rec-
ommended that the bearing setscrews be checked
periodically to ensure that they are tight.
14. The rotating wheel requires particular attention since
materials in the air being handled can build up on
the blades to cause destructive vibration or weaken
the structure of the wheel by corroding and/or erod-
ing the blade metal. Regular inspection and correc-
tive action at intervals determined by the severity of
each application are essential to good service life
and safety.
Motor Lubrication
Motors which contain ball bearings are permanently
lubricated from the factory. No additional maintenance
is required.
Motors which contain sleeve bearings require lubrication
every six (6) months. Use SAE-20W lubricant and add
five (5) drops to each location shown in Figure 10. DO
NOT OVER LUBRICATE.