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Rebuilding a 75HP motor

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  1. #1
    406Refining started this thread.
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    Rebuilding a 75HP motor

    Hey everyone,



    Hope you're all keeping busy with your scrap ventures. I recently bought a 75hp electric motor from a farmer that was cleaning out their field. Since I currently have the highest prices on scrap electric motors in town ($0.10/lb) I usually get a few calls every once in a while for big motors. Anyhow, I figured it would be interesting to document what it takes to have one of these units refurbished for selling. I know scrapping them could bring in a good amount of copper, but if a motor this size can sell for a few thousand dollars it may be worth selling vs. scrapping.

    The pictures don't do justice to the size of this motor, but it's about 18" in diameter and about 3-4 feet long.


    The first thing I did was make sure it spins freely and inspected the wiring:

    I removed the back fan guard to remove all of the loose dirt/sand that was sitting in the bottom of it. Since it was sitting out in field there's quite a bit of it.

    I've also cleaned the wiring area out of the random junk and wasp nests in there. The good news is that this unit passed the motor winding resistance test (not burned out) so we'll see what the rebuild shop says tomorrow about going through it to prep it for selling.

    Current Investment: $120

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  3. #2
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    Quote Originally Posted by 406Refining View Post
    Hey everyone,

    Hope you're all keeping busy with your scrap ventures. I recently bought a 75hp electric motor from a farmer that was cleaning out their field. Since I currently have the highest prices on scrap electric motors in town ($0.10/lb) I usually get a few calls every once in a while for big motors. Anyhow, I figured it would be interesting to document what it takes to have one of these units refurbished for selling. I know scrapping them could bring in a good amount of copper, but if a motor this size can sell for a few thousand dollars it may be worth selling vs. scrapping.

    The pictures don't do justice to the size of this motor, but it's about 18" in diameter and about 3-4 feet long.


    The first thing I did was make sure it spins freely and inspected the wiring:

    I removed the back fan guard to remove all of the loose dirt/sand that was sitting in the bottom of it. Since it was sitting out in field there's quite a bit of it.

    I've also cleaned the wiring area out of the random junk and wasp nests in there. The good news is that this unit passed the motor winding resistance test (not burned out) so we'll see what the rebuild shop says tomorrow about going through it to prep it for selling.

    Current Investment: $120

    Wow! 75HP? That's a bigg'un. I used to work on 5HP circulation pump motors that looked physically about that size.

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  5. #3
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    Looking forward to seeing this progress!

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  7. #4
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    I didn't know they made them that large. Whelp, guess I'm not bringing you that trailer for awhile now
    More than Scrap Value Shipment Tips: http://www.scrapmetalforum.com/scrap...tml#post242349

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  9. #5
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    Great project! Looking forward to following your progress!

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    Interesting project. Looking forward to seeing the progress as well.

    Looks like you've got a couple of high volume water pumps there too. ( The red things) They're pretty durable. It's been close to 20 years since i've worked on one of those, but of memory serves, the shaft seals have to be repacked every so often. (Not expensive or hard to do.) I'm thinking the impellers inside would be fairly good size and made of brass. Might be worth it to crack one open if they're just going to scrap.

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  13. #7
    406Refining started this thread.
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    Quote Originally Posted by hills View Post
    Interesting project. Looking forward to seeing the progress as well.

    Looks like you've got a couple of high volume water pumps there too. ( The red things) They're pretty durable. It's been close to 20 years since i've worked on one of those, but of memory serves, the shaft seals have to be repacked every so often. (Not expensive or hard to do.) I'm thinking the impellers inside would be fairly good size and made of brass. Might be worth it to crack one open if they're just going to scrap.
    Those are some high volume pumps sitting there! I got 5x of those pumps and 5x 15hp motors at an auction in Cody, WY for $50 each. I was hoping to salvage the complete assemblies with frames, but the frames had cement poured in the middle. They had to be disconnected from everything which was kind of a pain, but I walked away with a good deal and about 80 pounds of #2 ins. from the motors. I'm still unsure what I'm going to do with those pump assemblies. On one end I could see scrapping them to get them out of the way, and on the other end I could selling them for $50 each (they have quite a bit of rust around the flanges). I haven't tried popping one open, but the props are either brass or stainless. I'll get one of them cracked open later today and post some pics.

    The motors are a completely different situation. Since 4 out of 5 of the motors are identical I could see holding onto them to build a mega quad axle shredder which would make disassembly of ewaste a quick task. The real question is do I really really need a shredder that big. I mean just because you can do something that big doesn't mean you should. It would be cool, but we'll have to see If I end up selling them I could see each one going for $300-$400 each. They'll probably sit on the shelf for another few months before they finally get listed.
    Last edited by 406Refining; 06-24-2020 at 10:04 AM.

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    406Refining started this thread.
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    I finally got a chance to put the motor on the scale and see it's real weight. It came in at 765 pounds. Not as big as I thought, but not a small one either. I dropped it off at the rebuild shop yesterday and The rebuild shop just tested it and the unit runs! They're going to clean it, replace the bearings (they are slightly worn out), and repaint the unit for $400. They also have a buyer for the unit already! I have to negotiate out the details on the shipping (buyer is in Idaho), but I would call this experiment a success so far.

    Current investment: $520

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    That's awesome! Love it when a plan comes together like that!

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    Glad to hear that it worked out! Hopefully you end up making a nice chunk of change on that motor. So nice to see it getting some use instead of being scrapped, and glad to see that there's now room in your warehouse. I'm on it- I'll take care of that empty space :P

  18. #11
    406Refining started this thread.
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    The finished product:



    Tomorrow I call the prospective buyer and get a deal worked out for the motor!
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