JD 70 Diesel - need some advice
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    Ghuds's Avatar
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    JD 70 Diesel - need some advice

    I have the opportunity to pick up a 70 diesel, I have a 70 gas currently that I'm thinking of selling. The diesel has been sitting for eight years but was moved about two years ago. The current owner knows nothing about it, it came with the property he bought. He said the guy who moved it thought it was in great mechanical condition. It seems to be complete, with power steering and three point. I assume I will need to drain the diesel and gas tanks and possibly clean the pony motor carb in order to try and start this thing. He said the guy that moved it bump started it, which I'm assuming he couldn't get the pony motor going or didn't try. Is there anything else I should do or look for to try and get the motor started? Also, is the diesel just more complicated and harder to work on then the gas model? Any input would be greatly appreciated.
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    JD 70 Diesel - need some advice

    Keep the gas and buy the diesel. Then you’ll have two.

    Diesels are different to work on. Injector pumps instead of carbs. Two engines with the starting one.

    Would be a neat project though.


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    Ghuds's Avatar
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    I wish I could!

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    Quote Originally Posted by Ghuds View Post
    I have the opportunity to pick up a 70 diesel, I have a 70 gas currently that I'm thinking of selling. The diesel has been sitting for eight years but was moved about two years ago. The current owner knows nothing about it, it came with the property he bought. He said the guy who moved it thought it was in great mechanical condition. It seems to be complete, with power steering and three point. I assume I will need to drain the diesel and gas tanks and possibly clean the pony motor carb in order to try and start this thing. He said the guy that moved it bump started it, which I'm assuming he couldn't get the pony motor going or didn't try. Is there anything else I should do or look for to try and get the motor started? Also, is the diesel just more complicated and harder to work on then the gas model? Any input would be greatly appreciated.
    Here's the starting routine for your JD 70 Diesel:

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    The 70D is a bit more complicated, but it is also a legendary and powerful two cylinder machine. I'd own one in a heartbeat, especially if I had room or need for one.

    The pony motors can be a PIA. Parts are difficult to find and expensive. Many 70D's were converted to electric start for this very reason. If the pony is in decent shape, keep it. The tractor is considerably more valuable with it and the cool factor goes through the roof.

    Get the 70D and don't look back! We'll need lots of pics and videos!
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    Thanks for the info. I've been researching the diesel and other than the more complex starting procedure, its pretty much the same as the gas as far as power and weight, but way more fuel efficient. The main reason I'm considering the diesel is for the power steering (as well as the cool factor). I have a Duall Loader on the current 70 and its a total beast to steer. It pretty much takes 3 feet and 4 hands to operate the loader and the tractor. I think I'll make an offer on it, but try and get it fired before I do.
    Also, my tractor is 12v negative ground. Would the diesel be the same? I looked at the Tractor Data website and it says all 70's were 6v positive ground - is that correct?

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    Keeper of the GTT Cookies dieselshadow's Avatar
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    You almost can't go by what is said on the internet these days concerning the electrical systems on the old 2 cylinders. So many were converted. So many were changed, it's hard to be accurate on what yours should have.
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    OEM was 6V positive ground for starting the pony. Pony is far more reliable starting in cold weather than electric start.


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    Quote Originally Posted by Superglidesport View Post
    Here's the starting routine for your JD 70 Diesel:
    Not all of the 70's used the same system to start the pony motor, the one I had used the lever forward to start the pony, then all the way back, then forward to engage.

    And, yes, 6V positive ground!

    I much preferred the electric start 720's we had! Click image for larger version. 

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    Quote Originally Posted by grnspot110 View Post
    I much preferred the electric start 720's we had!
    I came close to buying a 720 once. Passed and let a friend buy it. Got to work on it anyway..........
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    JD Tooth Bar, Deluxe Hood Guard, Ken's Bolt-on Hooks
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    Tarter 5' 3PH Tiller
    Frontier AP12F Forks

    John Deere 2032R
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    Curtis Hard Side Cab & Heater
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    54 Snowblower
    Super HeavyHitch
    Little Wonder "Optimax" & JRCO Blower Buggy
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