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HP for a 12' John Deere Disc?

B

blunosr

Member
Hi, I'm planning to get another tractor in the Spring. I have a 100 Intergral John Deere Disc. How many hp would be ideal to pull it, assuming 2wd and ag tires? It's about 12' wide and has four 6.5' gangs of discs.

Thanks,

Troy Boyd
 
Is this to finish a field or to tear it up to start with. The boys have a 23 foot IH disk. We can pull it with the small tractor (130 Horsepower) but it is so much nicer when the horsepower on the front is about 160. When I worked for a dealer I remember one of the first 70+ horsepower tractors we sold and the customer hooked it to a 12 foot disk, but it was all used on plowed ground. What size disk do your neighbors have and what horsepower do they have in front of it? Are you going to pull anything like a harrow or rolling baskets behind the disk?
 
There are variables such as soil type, depth, etc. but a general rule of thumb in my area is 6 hp per foot. Checking with some local farmers in your area would be your best bet.
 
I've been told it takes about 1.5 hp per blade on a average for average conditions. I have found that to be fairly accurate from my experinces.
 
We used to pull our 13ft IH disc with our '51 G John Deere, any field, anytime, in 2nd gear, 3-1/2 mph.
The G had the gasoline update and dynoed at 52 HP.
And grandpa could also pull it with his Super M Farmall.
I don't remember what his HP was.
 
45 to 50 HP should do a good job. On unplowed ground it would be easy but on plowed ground it with give it a load.
 
I had a 12 foot Deere disk.. I think it was a model RWA iirc...

I pulled it with a Massey-Harris 33 (35-40 horses) and it seemed to pull it ok (but I had light soil)

I also tried pulling it with my D-17 Allis.. (closer to 60 horse) and I myself didn't like how it pulled the disc, but it'd pull my 12' Glencoe field cultivator better than the Massey.. (Still don't make any sense to me to this day.. I guess a lot of factors figure into it)

I'll side with the 50ish hp range also.. but a thought to ponder is a tractor with more power is better than a tractor with not enough power, at least in my opinion

Brad
 

According to JDparts.com these are the different sizes of a 100 integral disk harrow
FRAME, GANG (7-1/4") SPACING 6'9", 7'10", 10'1", 11'4"
FRAME, GANG, (9") SPACING 6'7", 8'0", 9'5", 10'0"

So the largest width would be 11'4" with a disk spacing of 7-1/4". I would consider this impl. as a finishing disk not a primary tillage disk because of the close spacing of the disks. Lifting may be a larger problem than pulling but I'd guess a 60 HP. I've never seen a 100 that large but 110 are the drawn models and they aren't real hard to pull.
 
I used on behind a JD3010. I had to raise it up a tad if I got in damp soil
Worked much better when I hooked it to the 966.

Gordo
 
I tend to agree with you; I suppose it's all about what is considered "disking". Never owned a 100 series, but we had numerous AW and BW series disks in various widths......way back when. There wasn't a-one-of-them (the 12 foot ones) that we could pull with less than a 70-75 pto hp tractor and they pulled better with a 4020.
 
I had a 12' IH disc in plowed ground, and it was all a JD 2020 wanted (on the level- wouldn't pull it uphill), worked much better with Oliver 880 (about 62 HP, I think). To really get the benefit out of a disc, you need to be able to pull it fast enough to throw the dirt around a little bit, not just struggle along, bogged down and nearly getting stuck.
 
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