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John Deere Tractors Discussion Forum
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720 D Electric start conversion

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720

01-29-2004 09:10:15




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I am going to convert my 720D to electric start using JD parts but would like to use a 12V starter, what can I use. Someone must know.




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MIKE HANLEY

01-30-2004 01:37:36




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 Re: 720 D Electric start conversion in reply to 720, 01-29-2004 09:10:15  
We converted both our 730D's to 12 volt nev ground. Last week I started the WF one at 14 degrees without plugging it in. Ours were 24 volt, and it was such a pain in the butt to keep the batteries in balance so that you had the full 24V for winter starting. We took the 24V starters to a factory rebuilding place in Friedship Wi that has done 100's of conversions. They use the old 24V starter caseing and then put in a 12 Volt ARM and FIELDS for a 12V John Deere industral starter. We have two 12 volt battries under the seat not only hooked together, but both batteries have there own cable going to the same terminal on the starter. There are other tricks to the wiring as the converted starters still are internal ground and have to be grounded to the frame. And we also wire in a jumper selnoid at the starter. Cost wasn't bad as everything was there. It was just the convertion and the cost of an ALT. But to covert a pony you need a lot more stuff running up the cost and lessing the value of the tractor in the eyes of many. If it's a working tractor that you never intent to sell, then the value is what you want.

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Soldier Tom

01-29-2004 18:03:00




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 Re: 720 D Electric start conversion in reply to 720, 01-29-2004 09:10:15  
720, what happened to your pony to make you decide to swap out? I have a 720 d'sel w/pony and just wondered what broke your camel's back when it came to it. I have put some $$ into mine, but not too much all things considered. I have more problems with my pony clutch than the motor itself. How about emailing me and let's compare notes, perhaps one of us could help the other? Im right on the TN/KY border by Nashville, TN; where are you?
~Walk in peace~

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720

01-30-2004 09:10:16




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 Re: Re: 720 D Electric start conversion in reply to Soldier Tom, 01-29-2004 18:03:00  
I am using all Deere parts for the conversion. Slowly I will get the hood and the dash. Don't get me wrong, I like to pony but I have spent just about as much for the bracket, breather, and both intake and water manifolds as I did for a carb kit and coils!
The pony has a bad rear main seal leak. It seems as much as I tinker with it, the thing just does not run quite right. I think they are real sensitive to weather. I can get it to run great on a cool day and then its hot and humid and the thing wont run. I'm tired of messing with it, I'm going to keep all the parts just in case but the way I look at it, its my tractor and I use it quite a bit and I just want a more "user friendly" 720.

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Soldier Tom

01-30-2004 13:18:38




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 Re: Re: Re: 720 D Electric start conversion in reply to 720, 01-30-2004 09:10:16  
720, I can sure understand about the user-friendly aspect. If you don't mind my asking, did your clutch ever give you problems with engageing the flywheel, or spinning before engagement? Im just curious how common this happens. I reckon if I used the tractor ever day for working that pony might get a little wearysome. But as it stands, if you decide to part with the pony/transmission give me a holler and maybe we can work something out?
~Walk in peace~
Soldier Tom

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Don C

01-29-2004 12:01:52




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 Re: 720 D Electric start conversion in reply to 720, 01-29-2004 09:10:15  
720 I did this two years ago on a 70 diesel. The part number that I have for the starter is AS1213 I think they even had to get a starter drive to match the ring teeth on the fly wheel. All parts came from JD. Hop this Helps! Don C in MN.



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buickanddeere

01-29-2004 11:38:53




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 Re: 720 D Electric start conversion in reply to 720, 01-29-2004 09:10:15  
It's your tractor to do as you please. It's just that by the time the starter, starter bracket, the larger electric start battery box, ignition switch change, wiring harness change, generator change, de-valuation of the tractor and the cost of two very large cold cranking amp batteries every 2-5 years is purchased. Repairing the starting engine can be quicker and cheaper than an electric conversion. If nothing else place all the starting engine parts in a single box kept clean, dry and labeled. Unless the conversion is done with proper planning, correct/quality parts and careful workmanship like Mike Hanley did on his 730(s). The tractor will not perform as desired.

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Mike M

01-29-2004 10:50:41




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 Re: 720 D Electric start conversion in reply to 720, 01-29-2004 09:10:15  
I saw your post before and for lack of an excact answer try this.Do you have the factory mounting
bracket or a homemade one ? I would think that a local starter rebuilding shop could look you up one and I also think that they are no differant than a starter off of one of the millions of semi trucks running around.These all have adjustable noses for position and only a couple of drive choices by tooth count.When I rebuilt mine a few years back it used all standard parts.

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Steve

01-29-2004 10:01:56




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 Re: 720 D Electric start conversion in reply to 720, 01-29-2004 09:10:15  
I believe you can use 4020 starter



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Mike W J

01-29-2004 11:28:07




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 Re: Re: 720 D Electric start conversion in reply to Steve, 01-29-2004 10:01:56  
a 4240 4440 4640 4840 etc I think all have the same bolt pattern along with late 4020 etc. and would all be 12 volt



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