Many times the vent fan's bushings(bearings) get full of dirt and lock up, then the thermal overload burns out. Check to see of he fan spins freely, if not take fan apart, clean bushings, oil, and good chance overload is fried. Use ohmmeter to see if overload is bad. The overloads on my fans are one shot deals, like a fuse.
I've wired in an external 3a fuse for my vent fans. The idea is for the fuse to burn out before the thermal fuse, when motor locks up due to dirt.
I also have a short cord on my vent fans, so I can get on roof in the morning, while cooler, remove the vent cover on roof, unplug cord, and pull motor out without getting in the attic and getting in the insulation.
4-5 years is about all I get on a vent motor without cleaning and oiling. I used to get my thermal fuses at Radio Shack which moved out of town.
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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