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Thread: removing elec motor fan
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13th Oct 2019, 06:02 PM #16Most Valued Member
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13th Oct 2019, 06:05 PM #17Most Valued Member
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13th Oct 2019, 06:49 PM #18
Hi Peter,
I would rub the rust off the end of the shaft first !Best Regards:
Baron J.
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13th Oct 2019, 09:49 PM #19Senior Member
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Hi Peter,
The fan is a thermoplastic so heating it up will make it expand more than the shaft and also make it less likely to break. Leave the lot in a hot location in the sun for a few hours should do. There appears to be recycling number on the fan which is not readable on the pictures, what does it say?
Mm.
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14th Oct 2019, 08:33 PM #20Most Valued Member
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14th Oct 2019, 08:50 PM #21Most Valued Member
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Tah Dah
Well I got the fan off this arvo. With no damage as well. Thanks to BaronJ for your excellent suggestion re a puller. (and yes I did remove the rust first)
I grabbed one of my old, heavily modified, home made pulling plates this arvo and modified it a bit more by drill and tapping four 6mm holes at the correct PCD in it.
Then I used 4 round head screws with the edge of the head just hooked over the back edge of the steel retaining ring. It was a bit fiddly getting the screws in but got there eventually. (In hindsight I should have cut a screw driver slot in the end of the screws to make it easier to screw them in.)
First attempt failed as the screws just splayed out until the head slipped off the retainer.
fan puller 001.jpg
I then was able to get a hose clamp around the outside of the screws to stop them splaying out.
fan puller 002.jpg
After that it was easy peasy. The retainer and the fan moved together until the retainer got past the end of the shaft. Then the retainer fell off leaving the fan behind.
fan puller 003.jpg
That came off very easily with a bit of a wriggle.
fan off 01.jpg
This motor is almost new. The bearings are absolute rubbish. Stamped "NSK - Poland" However I dont think the bearings have ever been anywhere near Poland. I can grab the outer race and wriggle it around from side to side. I've replaced bearings in machinery that had thousands of hours on them and they were in better condition than these things. Check out the dings in the shield.
bearing.jpg
So I'll try and get some better replacements this week. All good fun.
Thanks to everyone who offered advice on this fan removal.
peter
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15th Oct 2019, 01:55 AM #22
Hi Peter,
I'm glad that you were successful in getting the fan off
Now when you come to put it back on, put the ring back on the fan and use a tube to gently tap it back into place.
With regard to the puller, I'm sorry, it never occurred to me to mention cutting a screw slot in the other end.
And I like the trick with the hose clamp ! That could come in useful.Best Regards:
Baron J.
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15th Oct 2019, 07:49 PM #23Most Valued Member
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I bought some new bearings today. $13.20 for two 6205ZZ. SKF made in japan.
When I got home this arvo I pulled the original ones off, fitted the new ones and put it all back together. Fan went back on fine.
Now when turning it by hand there is total silence. Beeuutiful.
Good quality bearings are very underrated I think. In common sizes they are cheap as when you consider the technology involved in making them.
peter
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