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John Deere Tractors Discussion Forum
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80 Diesel Update

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720Deere

01-10-2004 17:00:58




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Well we went to the dealer to look at the 80 that I posted about a while back. He put it on the dyno and once everything got up to temperature, the show began. It was only 12 degrees here in MD today, so we couldn't get the temp up fully on the tractor. The throttle linkage needs adjustment and it would only turn around 1100 rpm with no load. At this throttle setting, it made about 63 hp. With the throttle linkage manually opened to about 1250 rpm, it then made 67 hp @ 540 pto rpm. It will lug down to nearly 80 hp @ 450 pto rpm (which puts the tractor rpm @ about 1000). We ran it on the dyno for 20 to 30 minutes and I have to confess I was impressed. Judging by the lack of thick black smoke when we lugged it down, I would say the fuel rack is probably at the factory setting. The pony runs great and puts out far less smoke than a Dodge minivan. The big motor has no oil smoke and no noticable blowby. All gears seem quiet and you hardly notice that this beast does not have power steering. All sheet metal is in excellent condition with only 3 or 4 small dings. The fenders are not rusted and the paint is in real good condition. I am usually a pretty harsh critic, but I believe that this thing really only needs new decals and a polish and it will be mint. It looks like all that is left is the haggling and hopefully we will give her a new home.

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ron in MN

01-11-2004 14:02:03




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 Re: 80 Diesel Update in reply to 720Deere, 01-10-2004 17:00:58  
I was under the impression that all 80s had power steering, but that must not be so.



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720Deere

01-11-2004 14:15:14




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 Re: Re: 80 Diesel Update in reply to ron in MN, 01-11-2004 14:02:03  
We found out that 290 were made without power steering and most of those were exported. It steers suprisingly easy. It is not easy to turn when not running, but the way the front end kind of bounces when running makes it steer rather easy even when not moving. On the move, it steers as easy as most two cylinders I've driven with power steering

It sure is an odd feeling to drive one of these when you are used to row crops. The hood looks to be 20 feet long and 5 feet wide. Poor visibility and sitting behind the rear wheels make for a unique feel.

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Brandon

01-11-2004 14:11:11




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 Re: Re: 80 Diesel Update in reply to ron in MN, 01-11-2004 14:02:03  
Nope, the Power Steering was an option. Manual was standard on the 80 and ALL other two cylinders that I can think of, except for the 840. PS was just so popular that few tractors came without it!

By the way 720D, my 80 is also about a 100RPM slow at wide open throttle. You say you were able to rev yours up with the linkage? I might have to look at mine.

Brandon

My Industrial John Deere website
John Deere Diesels
The LaGrange Engine Club

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720Deere

01-11-2004 14:20:45




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 Re: Re: Re: 80 Diesel Update in reply to Brandon, 01-11-2004 14:11:11  
Brandon,

On the left side of the tractor in front of the governor, where the linkage goes into the governor are the throttle stops. The linkage from the throttle lever to the pivot rod must need adjusting because the linkage was not going all the way to the wide open stop. I was able to pull it by hand and then we had about 1225+/- rpm.

There is definitely an adjustment needed on the linkage because when pulled back all the way, it will shut off without pulling the over-ride to allow full travel.

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Brandon

01-11-2004 17:09:10




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 Re: Re: Re: Re: 80 Diesel Update in reply to 720Deere, 01-11-2004 14:20:45  
I was just looking in the manual tonight to see what I need to adjust for the high idle. Shouldn't be too bad! Maybe...

How long did it take you to find the throttle linkage with the hood, flywheel, and wheel in the way? :)

My throttle shutoff is the same as yours, as well! I don't even need to use the lever travel knob to kill the engine. Yet another small project on the list this winter!

Brandon

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johndeeregene

01-10-2004 23:19:27




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 Re: 80 Diesel Update in reply to 720Deere, 01-10-2004 17:00:58  
you will love having the 80. there is nothing like plowing with one. they are just a ball of fun until you have to turn in short area. they dont turn short at all.
i am getting ready to put the pony back on my 80 after an complete rebuilt. that is something else.
good luck an have fun. '
johndeeregene



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Duane(Pa)

01-10-2004 20:15:26




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 Re: 80 Diesel Update in reply to 720Deere, 01-10-2004 17:00:58  
Sounds like a man in LOVE. Whadda you guys think? Still remember what the guy said when we got my 830 on the trailer...Guess I better use the BIG chains....Yea, lets use the BIG chains.



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Brandon

01-10-2004 21:54:18




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 Re: Re: 80 Diesel Update in reply to Duane(Pa), 01-10-2004 20:15:26  
Duane, I agree with ya! There is just something about the big 80-830 that is just so cool...

720D, glad to hear everything went OK!

Brandon



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