Manual
4 Twin City Fan Companies Engineering Supplement 2-06
bore hubs), or for bushing bore hubs, progres-
sively tighten the bushing bolts per Table 3.
Record the measured torque value.
c. Insert shaft through opening in drive side. (If
splithoused unit, lower into position.)
d. Install bearings onto shaft. Do not tighten bear
-
ing setscrews at this time. The bearing housing
should be perpendicular and the bearing base
parallel to the axis of the shaft to prevent loads
caused by misalignment.
e. Mount assembly, bolt bearings to drive stand.
Shaft must be parallel with side of bearing
pedestal.
8. Arrangement 3 (Split-housed) units (See Figure 4):
a. Parts on DWDI units are assembled in the fol
-
lowing order as viewed from opposite drive side:
Bearing bar assembly and opposite bearing, fun
-
nel, (housing side), wheel, (housing side), funnel,
drive side bearing bar assembly, drive bearing
and sheaves. Mount bearing bar assembly to
housing. Center wheel in funnels.
b. Parts on SWSI units are assembled in the
following order as viewed from opposite drive
side: Bearing bar assembly and opposite bearing,
funnel, (housing side), wheel, (housing side),
drive side bearing bar assembly, drive bearing
and sheaves. Mount bearing bar assembly to
housing.
c. Assemble parts in above order on shaft.
d. Move assembly into position. Lightly bolt bearings
into place.
e. Shaft should be parallel with discharge of hous
-
ing. Move bearings to accommodate. Follow
bearing alignment instructions per step 5 in fac
-
tory assembled units section above.
f. Level shaft; shim bearings if required. Tighten
bearing setscrews.
9. Install motor on base. Carefully align shafts for drive
installation.
11. Check that bearings are fully lubricated and check
the oil level in the static oil lube systems (if
supplied).
12. Install any accessories shipped loose from the
factory.
Fan Installation - Disassembled Units
General instructions for industrial centrifugal fans – For Axial
fans (including mounting arrangements for inline centrifugal
fans), follow assembled fans instructions above and use
Appendix B for assembly details.
A unit is considered “disassembled” if any component
required for proper operation is shipped or supplied sepa
-
rately or in pieces. Reference earlier instructions concern
-
ing proper handling of fan components. Assembly shall
only be performed by trained personnel familiar with the
assembly of this type of equipment.
1. Move the lower half of the housing to its mounting
location (split housing).
2. Remove skids, crates, and packing materials carefully.
3. If vibration isolation is to be used, place the vibra
-
tion isolation base on mounting bolts. Line up holes
in fan base with bolts.
4. Place the lower housing on the mounting structure.
Carefully level the lower housing on the foundation
and shim as necessary using stainless steel shims
on both sides of each anchor bolt.
5. If the bearing pedestal(s) are separated they should
be installed next.
a. Move bearing pedestal(s) to mounting location.
b. Put vibration base, if any, in place. Set pedestal(s)
on bolt(s).
c. Do not distort bearing pedestal by forcing it to
align with a non-level foundation. Shim beneath
the pedestal as necessary.
d. Check the bearing centerline height. Adjust the
height to match centerline height of the hous
-
ing. High temperature units may require a lower
housing centerline when cold so that it will be
centered when hot.
e. Bring the bearing pedestal into square with the
housing using careful measurements or a large
square.
f. Bolt the pedestal into position.
6. If the wheel and shaft were shipped unassembled,
you must now install the shaft in the wheel.
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.
c. Clean the inside of the wheel bore with solvent.
Make sure the setscrews will not interfere when
inserting the shaft into the wheel bore.
7. Arrangement 1, 9 or 10: Drive Component
Assembly:
a. Insert shaft into wheel from back side of wheel
(Fig 3).
b. When shaft is flush with wheel hub, put key into
keyway and tighten wheel setscrews (for straight
Figure 3. Drive Component Assembly
Shaft
Centerline
Bearing
Pedestal
Sheave
Bearing
Inlet Funnel
Housing Side
Wheel
Assembled Bearing,
Shaft, Funnel, and
Housing. Frame
Angles Not Shown.
Figure 4. Split-housed Drive Component Assembly