Instruction Manual
Inlet
Cone
Wheel
Shaft/Bearing/
Bearing Plate Assembly
Housing
IMPORTANT
Lubricate bearings prior to periods of extended
shutdowns or storage and rotate shaft monthly to aid
in preventing corrosion. If the fan is stored more than
three months, the bearings should be purged with
new grease prior to start-up.
Fan Bearing Lubrication
The bearings are carefully selected to match the
maximum load and operating conditions of the specific
class, arrangement and fan size. The instructions
provided in this manual and those provided by the
bearing manufacturer will minimize any bearing
problems. Bearings are the most critical moving part
of the fan. Therefore, special care is required when
mounting them on the unit and maintaining them.
Refer to the following chart and the manufacturer’s
instructions for grease types and intervals for various
operating conditions. Never mix greases made with
different bases. This will cause a breakdown of the
grease and possible failure of the bearing.
Fan Bearing Replacement
Replacement of bearings requires disassembly of
internal components. For this procedure, access must
be available to both the inlet and outlet ends. The
following procedure assumes belts have already been
loosened and removed. (Belts are removed by adjusting
the motor pivot plate).
Reinstall components in reverse order of removal.
Reference the Radial Gap and Alignment section to
ensure proper wheel installation.
If the bearings cannot be removed from the shaft due
to corrosion or damage, the bearing plates can be
removed from the inner chamber. The shaft/bearing/
bearing plates can be removed as a complete assembly
from the fan inlet.
1. Unbolt and remove inlet cone (inlet side).
2. Loosen set screws at the wheel hub and remove
wheel (inlet side).
3. Remove bolts from drive bearing plate (outlet side).
4. Remove bolts from wheel bearing plate (inlet side).
5. Pull shaft/bearing/bearing plate assembly out of the
fan housing (inlet side).
6. Replace bearings on shaft/bearing/bearing plate
assembly.
Maintenance - continued
Motors
Motor maintenance is generally limited to cleaning
and lubrication. Cleaning should be limited to exterior
surfaces only. Removing dust and grease build-up on
the motor housing assists proper motor cooling.
Greasing of motor bearings is only required when fittings
are provided. Many fractional motors are permanently
lubricated and require no further lubrication. Motors
supplied with grease fittings should be greased in
accordance with the manufacturer’s recommendations.
When motor temperature does not exceed 104ºF (40ºC),
the grease should be replaced after 2000 hours of
running time.
IMPORTANT
Do not allow water or solvents to enter the motor or
bearings. Under no circumstances should motors or
bearings be sprayed with steam, water or solvents.
Recommended Fan Bearing Lubrication Schedule (in Months*)
Fan
RPM
Bearing Bore
1
⁄2 - 1 1
1
⁄8 - 1
1
⁄2 1
5
⁄8 - 1
7
⁄8
1
15
⁄16 -
2
3
⁄16
2
7
⁄16
- 3
3
3
⁄16 -
3
1
⁄2
3
15
⁄16 -
4
1
⁄2
To 250 12 12 12 12 12 12 10
500 12 12 11 10 8 7 5
750 12 9 8 7 6 4 3
1000 12 7 6 5 4 3 2
1250 12 6 5 4 3 2 1
1500 12 5 4 3 2 1 0.75
2000 12 3 3 2 1 0.5 0.25
2500 12 2 2 1 0.5 0.25
3000 12 2 1 0.5 0.25
# of
Shots**
4 8 8 10 16 25 41
* Lubrication interval is based on 12 hour per day operation and
maximum 160º F housing temperature.
For 24 hour per day operation, the interval should be cut in half
** Lubricant should be added with the shaft rotating and until
clean grease is seen purging from the bearing. The lubrication
interval may be modified based on the condition of the purged
grease. If bearing is not visible to observe purged grease, lubricate
with number of shots indicated for bore size
• For conditions including high temperatures, moisture, dirt
or excessive vibration, consult the factory for a specific
lubrication interval for your application.
• Lubricant should be a high quality lithium complex grease
conforming to NLGI Grade 2. Factory recommends Mobilux
EP-2.
• The use of synthetic lubricants will increase lubrication
intervals by approximately 3 times.
• Storage periods of 3 months or longer require monthly rotation
of the shaft and purging grease prior to storage and start-up.
Mixed Flow10