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disk size

In plowed ground a 14 footer would make it work if your disking deep. A JD 80 is not that large when you look at drawbar horsepower. A JD 3020 is larger.
 
A lot of variables in that. I pulled a 12 footer with a forty horse tractor it was what i had to work with but it was semi mount and i ran at night to get more power. Duals in soft ground can make a gear different . Running at night with extra moisture in the air (check out water injection old trick still works) can make a difference. Size and type of blade also angle of cut.
If you only have a small amount to do just cover your wheel tracks or duals that will give you power to spare. Right now i got a ten foot on a 1550 in sod you wouldn't bother it soft ground without duals it makes out ok but don't get in a hurry .
 
We pulled a 12 foot behind an R, which is only rated at 43 drawbar. I see the 80 is 60 drawbar, should be able to pull 14-16 depending on variables.
 
A 3020 is not larger. The 80 has as much horse power and more weight. I have a early 820, which is the same tractor, and on the drawbar, it will pull as much or more than my 4020. The 4020 spins pulling a 15 ft disc, the 820 doesn't. A 720 or 730 will out do a 3020 plowing or discing. I have seen it done.
 
On paper a 3020 might seem like it's a match for the 80, but out in the field it is not going to hang with an 80.

Your soil type, amount of rocks, plowed/not plowed will matter a lot. As well as how well ballasted it is and how heavy the disk is. We have an 820 at 11,000 lbs that we used to work pulling 5-16's, I would expect it to handle an average 12 ft disk in almost any conditions.

Just for a comparison our 630 will pull a 12 foot John Deere AW disk in plowed ground, it works for it, but the 10 ft one works better. I know our 820 struggles with our just over 12 ft wide 1640 plowing disk in un-plowed ground, forget plowed ground, takes a 15,000 lb 4440 to handle it in loose soil.
 
I pull a 12 foot disc with an M Farmall. Running a two way cylinder and picking the wheels of the disc up makes that old gal sing in 2nd gear, but she needs a workout once in a while.
 
MikwinKy, I believe you were trying to reply to JDSeller and not to me, Leroy, as I only asked 4 questions and never mentioned a 3020.
 
Mike I am just going by the Nebraska test numbers and being around the JD R, 80,820 in the field.

Here are the Nebraska numbers:
JD 80 Diesel
Test weight. 11485
Speed. 6.63 MPH
Drawbar horsepower. 60.36

JD 3020 Diesel Syncro:
Test weight. 9840
Speed. 6.16 MPH
Drawbar Horsepower. 63.48

So here is the official numbers I based my statement on. Then I have been around the two cylinder JD tractors in the field when they where not collector items and where still work tractors. They where not power house tractors. Four bottom 16 inch plow and a 12 foot disk would work them hard in my area. We have hills. The JD 3020s pulled the same size equipment around here. The JD 4020s usually pulled 5x16 plows and 14 foot disk.
 
I was replying to the post about the 3020 being as large as a 80. Back when the 3020 was almost new, my neighbor bought one with a 4-14 plow and another neighbor had a 730 and the 730 would out pull the 3020 in our hard clay ground. I was comparing my 820 with my 4020 last year on the same disk and the 4020 had the horsepower advantage, but didn't have the traction. The 820 would pull better with a drawbar load. Around here a 4020 isn't enough for 5-16's. 4-16's is a better fit. Some tried to pull 4-14's with 3020's but it was a struggle. I used to pull 5-14's with a 4020 and it was all it wanted. I didn't intend to step on anyone's toes. I was just telling of my past experience. I am 65 years old, so I have been around these tractors a long time. I have 2 4020's now.
 
All I was saying is you just hit the wrong post for the reply. I knew who you were trying to reply to but it seems as tho some cannot understand the who replys to who. So they will be wondering why I got that kind of reply. I an a bit older than you at 73. And the biggest and newest JD I had was a 51 A. So no experiance there. Just trying to make the orignal poster realize he left out all the information that was needed to get a good answer.
 
Why are you trying to pull the guts out of the tractor? 8 foot will cover the wheel tracks. 10 foot will make you feel like you're doing something. 12 foot is probably as big as you really want to go. Take it somewhat easy on the old gal. Sure it'll pull more, but do you really want to break something?

If it was an old Farmall M I'd say go ahead and beat on it. They're a dime a dozen. A Deere 80 has to be somewhat difficult to find parts for.
 
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