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Started up - then Bang!

D

Dan S (NY)

Well-known Member
Fired up the 35 today to move it out of way to mow the lawn. Got about 15 feet and there was a big bang and clatter. Shut it off quick and discovered a fan blade had broken off. Got lucky it didn't put a hole in the radiator, just scraped up some fins. Good thing I was only moving it around on a fast idle. Probably a good idea to inspect the fan now and then for cracks!

Dan
a197532.jpg

a197533.jpg
 
Thanks for the reminder! You're right, we seldom think to check fan blades and the older they get, the weaker they become.
 
Typical north country weather related metal fatigue... when it goes from 100 below to a hundred above... somethin's gotta give...
funny to do that, since it's not a heat treated steel part is it? - or was it?
 
Just this weekend my Dad pointed out a crack in the fan blade on my Tractor. I was going to ignore it, figuring its probably been cracked for a long time, but after seeing yours, I think I will be looking for a new fan. Sure don't want to mess the radiator up. Glad yours didn't get the radiator. Thanks for sharing.
 
They do have new fans for sale on this site. Not sure how original it looks, but who can tell when its spinning!

Dan
 
A while ago I noticed that the water pump shaft has some wiggle to it, but I had not gotten around to replacing it yet because it wasn't leaking. I wonder if the shaft was vibrating while running causing fatigue of the blade? I'm going to swap out the pump before putting another fan on.

Dan
 
A bad pump bearing certainly can contribute to fan blade fatigue.

Also a bent or out of balance blade take out the pump bearings, even cause the shaft to break off. I would change the pump, especially now.

Think of the load that was applied to the shaft when the blade broke!
 
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