Motors; Fan Bearing Replacement; Fan Bearing Lubrication - Greenheck DFD Series Installation, Operation And Maintenance Manual
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Also See for DFD Series:
- Installation, operation and maintenance manual (12 pages) ,
- Manual (12 pages) ,
- Installation instruction booklet (52 pages)
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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.
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.
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.
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.
Shaft/Bearing/
Bearing Plate Assembly
Inlet
Cone
Wheel
10
Mixed Flow
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.
Recommended Fan Bearing Lubrication Schedule (in Months*)
Fan
RPM
1
⁄
2
To 250
500
750
1000
1250
1500
2000
2500
3000
*Suggested initial greasing interval is based on 12 hour per
day operation and 150º F. maximum housing temperature. For
continuous (24 hour) operation, decrease greasing interval by
50%.
•
If possible, relubricate with grease while in operation
without endangering personnel.
•
For ball bearings (operating) relubricate until clean grease
is seen purging at the seals. Be careful not to unseat the
seal by over lubricating.
•
For ball bearings (idle) add 1-2 shots of grease up to 2 in.
bore sizes, and 4-5 shots of grease above 2 in. bore sizes
with hand grease gun.
•
For roller bearings, relubricate with 4 shots of grease up to
2 in. bore size, 8 shots for 2-5 in. bore size, and 16 shots
above 5 in. bore size with hand grease gun.
•
Adjust lubrication frequency based on condition of purged
grease.
•
A high quality lithium base grease conforming to NLGI
Grade 2 consistency, such as those listed below, should
be used.
Mobilith SHC 220
Housing
Mobilith AW2
Shell Alvania #2
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.
Bearing Bore
1
15
⁄
-
16
- 1 1
1
⁄
- 1
1
⁄
1
5
⁄
- 1
7
⁄
8
2
8
8
2
3
⁄
16
6
6
6
6
6
6
6
5
6
5
4
3
6
4
3
2
5
3
2
1
5
2
1
1
5
1
1
0.5
4
0.5
0.5
0.25
4
0.5
0.25
0.25
Texaco Multifak AFB2
Texaco Premium RB
Exxon Unirex N2
IMPORTANT
2
7
⁄
3
3
⁄
-
3
15
⁄
-
16
16
16
- 3
3
1
⁄
4
1
⁄
2
2
6
5
4
4
3
3
3
2
2
2
1
1
1
0.5
0.5
0.5
0.5
0.25
0.25
0.25
0.25
0.25
0.25
0.25
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