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79646 Rotor will not spin  Rate Topic 
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 Posted: Fri Nov 6th, 2020 01:32 am
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Jeff Gavel
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So I am working on a 79646-AX with a date code of 30 and the rotor will not spin in the stator / Rotor is frozen. Likely from sitting around in old oil. So my first thought is some penetrating oil, but I don't want to damage the windings. 
Is this safe or are there other approaches?
Also, it's not clear to me where the outside of the rotor meets the stator  (A or B in the picture)
thanks for any tips. 


Jeff




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 Posted: Fri Nov 6th, 2020 10:25 am
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Mark Olson
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A is the gap where the rotor lives in the stator. It looks as if you have the nut off of the front of the bearing shaft, so I would thread the blade back on the rotor and turn while pulling the rotor out. Be aware that you should remove the gearbox so that you do not bend the oscillator worm shaft when putting the blade on.

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 Posted: Fri Nov 6th, 2020 08:10 pm
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Jeff Gavel
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Thanks,  tried that but she is on there good. started to flex the blade so I stopped that. Anyone used penetrating oil between the stator and rotor to break this thing loose? Is that dangerous to the insulated coil wires?

Last edited on Fri Nov 6th, 2020 08:11 pm by Jeff Gavel

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 Posted: Sat Nov 7th, 2020 06:19 pm
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Mark Olson
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Kano-Kroil should not hurt the enamel on the windings, but I would avoid drenching them. Kroil is the finest of its kind, just give it plenty of time to do its work.

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 Posted: Sat Nov 14th, 2020 11:03 pm
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Jeff Gavel
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Finally got this rotor to loosen up and become un-stuck. Plenty of Kano Kroil penetrating oil and applying with a syringe and a blunt tip needle to the area between rotor and stator, plus the inside of the rotor and the shaft. There was plenty of dried up old oil that had turned rock hard and acted like cement.
I positioned the fan horizontally so the the oil would drain down and away from the coils. It took 6 days and applying it 2 or 3 times a day. Then used the blade screwed onto the rotor for leverage. 


Using the needle has become a great way to apply small amounts of oil or cleaner to exact locations. 


Thanks to Mark Olson for the tip on the Kano-Kroil.  Great stuff. 






Last edited on Sat Nov 14th, 2020 11:04 pm by Jeff Gavel

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