Fan And Shaft Removal - Carrier Aero 39MN MW03-110 Series Installation, Start-Up And Service Instructions Manual

12" 24"
8601
8607
8601
8607
8601
8607
8601
8607
UNIT SIZE: 58T
(12) 24" X 24" FILTERS
(4) 12" X 24" FILTERS

Fan and Shaft Removal

On airfoil fans, the fan wheel and shaft may be removed
through inlet side of fan housing. See Fig. 211. On plenum
fans, remove side, top, or end panel opposite inlet, wher-
ever ductwork is not connected. After removing panel, pro-
ceed as follows.
1. Remove drive belts as described in Fan Shaft Bearing
Removal section (page 226).
2. Block up fan wheel within housing to prevent drop-
ping when bearing bolts are removed.
3. Loosen bearing holddown bolts, block shaft up.
4. Loosen bearing setscrews and locking collar, and re-
move holddown bolts. On forward-curved fans, re-
move cut-off plate. Remove fan wheel through dis-
charge opening.
NOTE: To facilitate easy removal of setscrew fastened
wheels, sheaves or bearings, remove the setscrew com-
pletely. Taking care not to damage threads, insert a flat
ended drift or punch, tap lightly and carefully return the
material displaced on the shaft by the setscrew to its origi-
nal place.
5. Remove bearing support channels and inlet ring from
one side.
6. Remove fan shaft and fan wheel from unit.
7. Remove fan shaft from fan wheel.
8. Replace shaft and wheel into fan in the reverse order of
their removal.
9. Inspect bearings and if serviceable, replace on shaft.
24" 24"
8607 8607
8607 8607
8607 8607
8607 8607
Fig. 210 — HEPA Filter Arrangement (cont)
262
24"
24"
24"
24"
10. For airfoil and forward-curved fans, align fan wheel
and shaft assembly in fan scroll. Check cutoff location
if wheel failure damaged cutoff plate. For plenum fan,
align wheel and shaft assembly per manufacturer's di-
rections supplied with fan.
11. Tighten bearing holddown bolts, bearing setscrews,
and shaft setscrews.
Fig. 211 — Fan Shaft and Bearing Removal