Your gonna need a shaft too I'll bet... Two man job. Leave the cage in. Ain't bad. Get the cage to spin on the old shaft first. Sand paper, WD, worst case scenario Portable band saw, well that might be over kill.
Shaft is ground down. Looks to be around 2" diameter and about 4-4 1/2 feet long. Kinda need to know the weight. Hatch is like 2 blocks away from the unit. Customer asked if I can rope it up...lol. NOT! I sprayed it with WD before I left.
assuming you are prepared with lots of oil and scratch cloth, it shouldnt be bad. two of my guys just did two units in a day last tuesday. prep work is the hard part,cleaning rust off, oiling, etc other than that, nut and bolt work. a clean shaft will make you curse a whole lot less. make it shine before you even try to move the cage.
Hard to tell from the picture. 2" shaft is usually a balloon shaft and much lighter than it looks. If it's a solid shaft & rusted badly I would cut it out and replace the blower wheels, too. That's a lot of work to do only to find out the wheels are out of balance when you're done.
Blower wheels are less expensive to replace when doing shaft & bearings, I would encourage you to replace them. They are a lot more expensive if you have to tear the unit down again. The shaft, if it's solid is really only about 40 lbs or so.
Solid shaft. Unit is only 5 years old. 1,000,000 BTU RUPP MUA unit. I found a set screw missing on the rear bearing, looks like it was missing for a while. Blower wheel looks ok, but you do have a point.
The shaft would weigh about 47 lbs if 2 inch about 25 if 1 1/2, if you have one made check the diameter close then seldom use an even number, I've really never seen a 1 1/2 or 2 inch usually 1 7/16 of 1 15/16 no idea why they do it but it's almost always broke down in sixteenths And there are penetrating oils much much better than WD 40, Kroil is good but the best I've ever used is CRC Knock 'er loose, that's some damn good stuff
A nice hot torch works well too. In Detroit I got to do some really big caged fans on auto plants and suppliers. Found an easy way to break the fan cage loose. Get the keys out and other stuff then spin the fan shaft get it going and use a piece of lumber in the sheave to stop it. Usually that big fan would break free and keep spinning till it stopped. Then a portable band saw came in handy. It was a good idea to have them big shafts turned too and take the bearings you are going to use when you went to pick up the shaft. Take those same bearings and make sure they slide all the way down the shaft. If not make em do it again.
Yes a gas ax is handy breaking them loose, but most of the time when I did them they were in office buildings and they would bitch about the smoke I have an Axelson 20X60 engine lathe, and Bridgeport mill have made a pile of money with them, some of the best is the hollow shafts, just turn the stub shaft heat them up slide the old one out and the new one in, if you work fast, you only need to heat it once, and when it cools down, the stub ain't going nowhere, and when you're done balance the shaft with stainless steel clamps, takes a little time but not all that much, most really didn't need any balancing
best oil i have see nfor this is mobilrama, more commonly known as mobilcoat, bit it stinks ot the high heavens.
