If you are planning to replace the shaft;
if your able to loosen the 2 square headed bolts( which must be done to allow for shaft movement) do so, then after bearings and pulley are off emerycloth (smooth no burrs or rust) the shafts 2 ends and get grinder and cut thru the shaft on the inside of squirrel cage area as close to the edge of cage as possible drive the shortened pieces of the shaft inward( oil this pieces to help ease movement thru blower wheel) until they are removed replace shaft with new shaft and re-install parts and or replace as needed bearings and blower wheel. I am getting ready to do this very job myself ( take measurements of shaft on each side to ensure your back where you started when done)
Sand the shaft to where it is shiny metal from hub to the shaft end. File off any burrs off the shaft. Use penetrating oil such as liquid wrench, knock 'er loose. Put the unsanded end of the shaft in a long tube or pipe up to the fan's hub. Now it's time to break the shaft and fan hub journals free. Any burr or shaft disfiguration must be filed off or the shaft will become stuck on the hub. Striking, jolting force, hammer the shaft or pipe/tube by use of wood protecting from direct blows as to push/drive the shaft thru the hub. Once it breaks free, remove burrs and keep wet with penetrating oil. Do not bend the fan hub disk to squirrel cage. Keep things plumb and straight and deburr to keep shaft-hub from sticking/hanging up.
Some units too far gone with rust will not budge and stay frozen together, will get destroyed if not meant to be. Carefully, shinny clean, square plumb driven under well lubricated condition, demurred, will have better luck in coming apart.
SOURCE: Do not know how to work/maintain swamp cooler
Make sure you have water to the unit, the water pump is on and the fan is working. No water=no cooling.
Hello
Looking at a image of this unit.You will need to remove the top cover of the shell of the unit.Usually 1/4 sheet metal screws.
Once the top cover is off you need to unbolt the housing the fan sits in and remve it all as on peice.Then you can get the fan out of the shroud it sits in.
I dont understand why you want too remove the fan.Usually the bearings and shaft the fan rides on can be replaced without removing the fan.Unless something damaged the balance of the fan.
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