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1971 E12


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#1 DH1 OFFLINE  

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Posted August 05, 2012 - 07:54 PM

I thought I'd better start a thread on this tractor that I recently got in a package deal, this is the one I'm going to keep out of the 4.
It's a 1971 E12, smallest of the large frame tractors that they made and has the simplest control circuit that they used. Has 3 forward speeds and 2 reverse, uses a Peerless 4 speed transaxle like in the Massey 10s, 12s but has no reverse gear. So you end up with 12 forward speeds and 8 reverse speeds.
You cab go backwards with the trany in 4th gear, the electric motor reverses direction to do this, by the hand control on the dash.

This tractor actually works, not 100% but it does move, the main drive belt slips, worn out and loose. Also only 1 of the forward and reverse speeds is working.
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#2 MH81 ONLINE  

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Posted August 05, 2012 - 08:04 PM

Doug, That's a nice looking ET. The 12 stands for approx HP doesn't it?

And don't let the fact that it's not switching gears get to you, it only takes one bad contact to cause all kinds of havoc in something like that.
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#3 DH1 OFFLINE  

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Posted August 05, 2012 - 08:42 PM

Here's some more info on the E12

http://www.myelec-tr...om/gez-5656.pdf

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#4 Littledeere OFFLINE  

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Posted August 05, 2012 - 08:54 PM

Petty neat tractors would like to have one of those in my collection one day
looks like you have yourself a nice heard going on there
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#5 daytime dave ONLINE  

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Posted August 05, 2012 - 08:57 PM

Doug. Looks good. I hope you get it trouble free soon. I'm sure it won't take you long.
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#6 IamSherwood OFFLINE  

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Posted August 05, 2012 - 09:21 PM

Looks good Doug. Are you planning on a total restore? I really like that shade of yellow.
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#7 mjodrey OFFLINE  

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Posted August 06, 2012 - 04:33 AM

Doug,looks good.Congrats on acquiring it.
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#8 KennyP ONLINE  

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Posted August 06, 2012 - 04:43 AM

Nice E-12. You'll get it all figured out in time. Have fun with it!
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#9 JDBrian OFFLINE  

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Posted August 06, 2012 - 06:20 AM

Doug, from your description it sounds like there are discreet speeds for the motor rather than a true variable speed. How do they accomplish that? Do they just tap the batteries at 12, 24 and 36 volts? That would be simple but require large relays to do the job. With batteries and their acidic fumes in the same area as the electrics it's not surprising that there would be issues after all this time. Those tractors were a very bold move by GE at a time when not many people were focused on the cost and environmental impact of fossil fuels.

#10 DH1 OFFLINE  

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Posted August 06, 2012 - 01:27 PM

Doug, from your description it sounds like there are discreet speeds for the motor rather than a true variable speed. How do they accomplish that? Do they just tap the batteries at 12, 24 and 36 volts? That would be simple but require large relays to do the job. With batteries and their acidic fumes in the same area as the electrics it's not surprising that there would be issues after all this time. Those tractors were a very bold move by GE at a time when not many people were focused on the cost and environmental impact of fossil fuels.


What they did was make a single handle control that has 3 forward speeds and 2 revers speeds in any gear.
They did this by using big resistors, or " the toaster" as it's called.
3 speeds,
slow- 2 resistors in series,
medium- 1 resistor, and
fast or full power- no resistor, motor directly connected to the battery pack, this is the most efficient speed.

Reverse only uses slow and medium, cannot get full power in reverse.
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#11 JDBrian OFFLINE  

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Posted August 06, 2012 - 06:36 PM

Pretty wastey on battery power dissipating all that heat in resistors. I guess it was the cheapest and simplest way to go. I imagine you would get a good upgrade in battery life with a modern controller installed.

#12 DH1 OFFLINE  

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Posted August 06, 2012 - 07:55 PM

Pretty wastey on battery power dissipating all that heat in resistors. I guess it was the cheapest and simplest way to go. I imagine you would get a good upgrade in battery life with a modern controller installed.


Remember these were made 69 to 73, designed 67, 68. The only silicon parts in this tractor are diodes (rectifiers).

Today I spent some time on it, tightened up the drive belt and went for a drive, moves pretty good, only has the medium speed, but it goes forward, backward, turns and stops. Now have to work on getting a good working mower deck together for it.
I would like to fix and keep the existing speed control, I can see a modern 3 bank marine charger going in it, the factory one needs lots of work.

#13 HowardsMF155 OFFLINE  

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Posted August 06, 2012 - 09:31 PM

Congrats on the new project! Looks like you're ready to dig in and have some fun!

#14 DH1 OFFLINE  

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Posted August 06, 2012 - 09:37 PM

Congrats on the new project! Looks like you're ready to dig in and have some fun!


If you can't drive them, use them, what good are they.

#15 DH1 OFFLINE  

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Posted August 12, 2012 - 06:54 PM

Today I was driving this thing around again and decided to charge up the batteries with my 36volt charger.
I rigged up a plug that fits into the accessory socket on the tractor. Made sure I had the right polarity and hooked it up, seems to be working, the wires both 110volt AC and 36volt DC get warm.
At the same time I topped up the batteries, since this is an old battery pack 7yrs I decided to mix some Epson salts with Distilled water.
Other members here have tried this old trick and had some success reviving old batteries. New battery pack will cost me $750. most likely more, so what have I got to loose.
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