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720D fuel gauge and sending unit wiring?


 
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FactoryFarmer
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Joined: 05 Feb 2010
Posts: 594
Location: Illinois

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PostPosted: Tue Jul 05, 2011 2:44 pm    Post subject: 720D fuel gauge and sending unit wiring? Reply to specific post Reply with quote

Can someone please tell me how to wire the fuel gauge and sending unit on a 720 diesel pony start?

I had a really hard time finding a 6 volt gauge so I just went to deere and they gave me what is supposed to be a 6 volt gauge but nobody really knows. I'm not afraid of burning anything up, either it works or it doesn't.

On the gauge I have three terminals labeled: G S I

On the sending unit there are two terminals labeled: S -

Now I can make some assumptions on what these mean and how to hook it up but I'd like to hear from someone else.

Thanks
 
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Irv Boersen
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Joined: 17 Nov 2009
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PostPosted: Tue Jul 05, 2011 5:02 pm    Post subject: Re: 720D fuel gauge and sending unit wiring? Reply to specific post Reply with quote

I did this 2 years ago, on a John Deere 720 Diesel, pony start, and
used the gauge and sending unit from EverGreen Restoration (Jerry
Trcka). He was very helpful. I would recommend him.
 
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buickanddeere
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PostPosted: Tue Jul 05, 2011 5:42 pm    Post subject: Re: 720D fuel gauge and sending unit wiring? Reply to specific post Reply with quote

The wiring diagram is in the JD electrical service
manual.
There is a single pole, double throw push button
switch on the dash. In it's normal state the gauge
and sender are powered from the generator, before
the regulator/cut-out.
When the engine is shut down. Fuel level can be
measured by pushing the button with uses battery
power to the gauge/sender.
 
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John T
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PostPosted: Tue Jul 05, 2011 6:19 pm    Post subject: Re: 720D fuel gauge and sending unit wiring? Reply to specific post Reply with quote

This may help

http://img.photobucket.com/albums/v437/M-MAN/SM-2029/70-720-GSE-JPEG.jpg

John T

Wiring Diagram

 
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730d se
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PostPosted: Wed Jul 06, 2011 4:46 am    Post subject: Re: 720D fuel gauge and sending unit wiring? Reply to specific post Reply with quote

I would be curious as to the fuel gauge that Deere sold to you. Not many people left at Deere parts counters that have a clue about 2 cylinder tractors. They will run the part number and sell something that "replaces" or subs to the part. Many times it may work but is not even close to the original part.
Look at the fuel line as an example for the pony motor on a 720/730D that is now sold at Deere. Not even a close resemblance, but it will connect and fuel will flow through it.
 
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FactoryFarmer
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Location: Illinois

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PostPosted: Sat Jul 09, 2011 5:58 am    Post subject: Re: 720D fuel gauge and sending unit wiring? Reply to specific post Reply with quote

Thanks guys for all of your help!

730d se wrote:
(quoted from post at 05:46:58 07/06/11) I would be curious as to the fuel gauge that Deere sold to you. Not many people left at Deere parts counters that have a clue about 2 cylinder tractors. They will run the part number and sell something that "replaces" or subs to the part. Many times it may work but is not even close to the original part.
Look at the fuel line as an example for the pony motor on a 720/730D that is now sold at Deere. Not even a close resemblance, but it will connect and fuel will flow through it.


I'm a little suspicious as well but my cousin is the parts manager and he always seems to go the extra mile for me in order to find the right parts. I guess we will find out.
 
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