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Homemade electric mower deck.


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#46 DH1 ONLINE  

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Posted July 28, 2011 - 07:42 PM

Picked up another cordless mower today identical to the one I sold, this one was a free be and has N/G batteries in it.
That gives me 2 - 24volt motors for the deck, now it's time to find a 38" deck off of something without spending a lot of $$$

#47 DH1 ONLINE  

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Posted July 31, 2011 - 08:29 PM

Torn apart the latest cordless mower I got, this one is identical to the one in the video. Found inside 1 loose battery terminal and 1 broken wire.
Fixed the wire, tightened up the terminal, tried it with the charge that was left in the batteries and it works. Running at 14volts, have the charger on it now and will see how it is in the morning. I paid $0 for this one.

Also got I line on a good solid 38" mower deck, going to pick it up tomorrow, guy wants $60. for it.

The plan is to take the 2 - 20" cordless mower motors and mount them on this deck, not sure if the 20" blades will work but the deck comes with it's own blades. Motors will mount in-place of the spindles, and I need to get 4 wheels on the deck, full floating deck.
The deck when finished will go with the Sears electric that I have, it's a 24 volt system, same as the cordless mowers are.
sears electric 00&.jpg

The Sears has a 24volt, 130 amp-hr battery pack.
The cordless mowers have 24volt, 17 amp-hr battery pack for each 1, so 34 amp-hr for the 2.
Cordless mowers have a run time of 45 minutes + or - ???
There is almost 4 times as much battery power in the Sears, not all that power is for the deck motors, it still has to move itself along.
Going to be interesting to see how it performs, that is if it even works.

Attached Thumbnails

  • sears electric 00&.jpg


#48 MH81 ONLINE  

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Posted July 31, 2011 - 09:59 PM

I Think you'll have a winner there. Thanks for the update

#49 DH1 ONLINE  

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Posted August 01, 2011 - 03:31 PM

Well here's where I'm at now.
I picked up the mower deck, good guy lots of lawn and garden tractor parts there.
Managed to get the deck cleaned up and stripped down.
Mounted the 2 motors that I have, found out that the last one I got which is an earlier model with a smaller battery pack looks like a better motor, it is a little bit heavier and has it's own internal fan where the other one does not, they both have the external plastic fan.
Now the bad news, the deck is not a 38", I think it's a 42"???, it came with 21" blades, the blades on the cordless mowers are 19 1/2". Pictures show the problem, blades are not close enough and I feel they will leave an uncut strip down the middle.
The only solution is to try to find 21" blades that will go on these motors or find another deck.
As I got it.
ET2 mower 002.jpg

With motors
ET2 mower 006.jpg

The problem
ET2 mower 007.jpg

Attached Thumbnails

  • ET2 mower 001.jpg
  • ET2 mower 004.jpg
  • ET2 mower 005.jpg

Edited by DH1, August 01, 2011 - 04:39 PM.
added pic


#50 KennyP ONLINE  

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Posted August 01, 2011 - 06:32 PM

Doug, I think you are in need of the elusive 'blade stretcher' or the much harder to find 'deck shrinker'.
Sorry for the issue. Hope you get it resolved. One thing, will longer blades have an effect on the motors?

#51 DH1 ONLINE  

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Posted August 01, 2011 - 07:40 PM

Doug, I think you are in need of the elusive 'blade stretcher' or the much harder to find 'deck shrinker'.
Sorry for the issue. Hope you get it resolved. One thing, will longer blades have an effect on the motors?


I think the longer the blade the more power needed to spin them because they will cut more grass, more load on them.

#52 KennyP ONLINE  

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Posted August 01, 2011 - 07:50 PM

That's what I was thinking. I'll look for my 'deck shrinker'. I know it's out there somewhere.

#53 IamSherwood OFFLINE  

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Posted August 01, 2011 - 07:55 PM

Looks like you're getting close.

If you can wait for the mail outta the states, take a look around here for blades. (if you're gonna try longer blades)
Blades, Mulching Kits, Shafts, Adapters & Acc

That stripe of grass would be unsightly, unless you dragged a reel mower behind you. Hey, you've got one.

#54 KennyP ONLINE  

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Posted August 01, 2011 - 08:06 PM

Install a small third blade behind those two. Wouldn't have to be 4-6" long.

If you added one more, you'd have a four blade deck.

Edited by KennyP, August 01, 2011 - 08:20 PM.


#55 MH81 ONLINE  

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Posted August 01, 2011 - 10:22 PM

Doug, is there enough room under the tractor to stagger the deck so there is an overlap. Have to be in there on a heck of an angle tho. Have to mod the casters too. Hmmm.

#56 DH1 ONLINE  

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Posted August 02, 2011 - 06:43 PM

The more I think about this the more I feel the best thing to do is find a deck that is a 38" cut, something that has 19" or 20" blades on it.
The guy I got this deck off of has another one that is a 38" cut, has 19" blades on it, so I guess I'll have to go and get it.
If I buy longer blades for the deck I have it's going to cost the same as getting the other deck.
This has given me a headache.

#57 MH81 ONLINE  

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Posted August 02, 2011 - 09:55 PM

This has given me a headache.


Been there, done that.

Stick with it Doug, you will get it.

#58 DH1 ONLINE  

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Posted August 03, 2011 - 08:24 PM

Picked up the other deck today, blades on this one are worn and measure 19 1/4"
Blades I have are 19 1/2"
I think I have a much better chance of getting this one to work.

Tested the batteries that came with the last cordless mower I got, charged them up with the charger that came with it, now one battery test good the other is down to 30% charge. Going to cycle this one a few times see if I can bring it back.

Edited by DH1, August 03, 2011 - 08:30 PM.


#59 DH1 ONLINE  

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Posted August 21, 2011 - 09:09 PM

I got the 38" deck stripped and cleaned up a bit, mounted the motors with the blades and it looks like this one is going to work.
The motors were easier to mount on this deck as I didn't have to enlarge the holes where the spindles were, but I did have to space them up a bit as the blades sit about 1/2" lower.
Also the blade clearance tip to tip is a bit tight, I need to move the motors 1/4" away for each other, so 1/8" outward for each motor should do it. There is enough clearance around the blade to the deck to do this.
I powered up each motor individually, first at 12volts then 24volts. I used 2, 12volt 34amp/hr lawn tractor batteries, took some amp readings at 24 volts, each motor draws about 20amps+ running full speed with the blade, not cutting anything. So the 2 motors are going to draw 40-45amps together.
I notice the blades spin up to speed faster with the larger batteries than when hooked up to the ones that come with the cordless mowers.
The picture with the meter shows steady running and goes higher when you first start it up.
ET2 mower 005.jpg

Attached Thumbnails

  • ET2 mower 003.jpg
  • ET2 mower 004.jpg

Edited by DH1, August 22, 2011 - 04:19 AM.


#60 MH81 ONLINE  

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Posted August 22, 2011 - 06:23 AM

Thanks for the update. Are you going to have to add batteries or upsize them to run this with the tractor?




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