Installation, Operation & Maintenance Manual
IM-995
11
Fan Installation – Disassembled Units With Split Housings (Cont.)
(refer to lifting/safety section)
6. If the impeller and shaft were shipped unassembled, you must now install the shaft in the impeller.
a. First use solvent to clean the protective coating off the shaft. Check all surfaces for corrosion or nicks and clean if necessary with
fine emery cloth or a stone. After thoroughly cleaning the shaft with solvent, do not touch it with bare hands as perspiration can
cause rust or pitting over time.
b. Remove keys from the shaft.
impeller bore.
d. Insert the shaft into the impeller from the back side of the impeller.
impeller set screws.
f. For Arrangement 3 fans, refer to the drawing for appropriate impeller and shaft dimensional relationship.
g. Check the assembly drawing to make sure that the impeller and shaft have been assembled correctly.
7. The rotor can now be installed in the housing. Slide the bearings on if they are solid
pillow blocks or loosely mount the bottom halves if they are split. Inlet vanes and/or inlet
funnels may need to be installed over the shaft before installing and bolting the bearings
Insert the inlets into the impeller inlet and tie them off
for lifting and placing in the housing. Refer to steps 8 and 9 for order of assembly of
components for double width and single width fans. The shaft should be cleaned and
oiled where it will contact the bearings. Carefully lower the shaft assembly into the
bearings. Use care when lowering the shaft onto the bearings so thrust bearings, collars
and liners are not damaged due to misalignment. The bearing housing should be parallel
to the axis of the shaft to prevent loads caused by misalignment. Precision shim bearings
thermal growth. Refer to bearing installation instructions in this installation manual.
housing. Center impeller in funnels.
b. Assemble parts in above order on shaft.
c. Proceed with connection of the shaft assembly to supports in step 7 above.
bar assembly to housing. Refer to the impeller-funnel overlap section.
a. Assemble parts in above order on shaft.
b. Proceed with connection of the shaft assembly to supports in step 7.
10.Install motor on the base if applicable. Carefully align shafts for drive installation. After the fan is leveled, prior to grouting, back
off leveling nuts if used.
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Rotor Installation/Removal Video
Click To View Our
Impeller Installation/Removal Video
Twin City Fan
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