Here's what I found in a 1993 brochure on a 9400 55 x26 cylinder
concave 1256 sq. in
beater grate 821 sq.in.
finger bar area 744 sq. in.
walkers 8618 sq. in.
cleaning 6370 sq. in.
engine 414/ 185 ponys
Hope this helps,
On capacity and dimension numbers, cleaning area, machine width, walker length, etc, a 7720 and 9400 are virtually identical. It has been a few years, the last time I compared the company brochures, that is what I remember.
In the field, our experience has been the 9400 will outcut (some, not alot) a 7720, horsepower and newer (larger diameter) cylinder design being the primary contributing factors. We run a 1994 9400 until 1999 when we traded for 9410, and now have over 2000 hours on it. Excellent machines, both. So are the 7720s.
You are asking about a 7721, with the tractor as the variable. In my opinion, a 7721 (pull-type) will not outcut a 9400, unless it is an early 9400 with the 359 engine, which I have not had experience.
You did not ask about comparing a 9500. The primary difference between a 94xx and 95xx is the 95xx has 18 more inches of walker, and more HP. Otherwise, a 94xx and 95xx are identical. Just in case someone asks.
Back in the old days (1960s), my dad and uncle had a 65 (pull type version of a 55) and a 55. They pulled the 65 with a JD 630 or JD 3010. The 65 had its own power unit. The 55 always outcut the 65, maneuverability being better with the 55. We were cutting standing wheat in Kansas. If you are picking up, There may no be much difference.
Jordan, I run a 7721 Titan 2, and pull it with a JD 4840, and it will nearly do as much as a 9600, the only thing that limits me is the 8 spd PS. My dad has the 9600, and when we're doing wheat and barley, the 7721 will nearly keep pace. The only place that I've found that it struggles is in durum, if it's light or has lots of beards. My straw walkers have a different size hole in them compared to the 9600, so that is something to keep in mind when looking at a walker machine. The 7721 has bigger holes than the 9600.
Manuverability is hands down to the SP. No matter what you do, the PT is an awkward beast.
Okay, Jordan. As usual, in the universe, the religious (the believers and the thinkers) are confusing the scientists (the facts). Your original question was what was the capacity of a 7721 (7720) and 94xx, not who could outcut the other.
I dug into my archives and found the brochures on 7720s. Exalta gave us the 94xx numbers, and below are the numbers comparing both. I have to correct an earlier statement, I said the walkers on a 9500 were 18 inches longer than a 9400, they are 20 inches. The 9400 walker length is 157 inches, and the walker length on a 9500/9600 is 177 inches. A 7720 walker length is 150 inches.
Those are the specs from the grain brochures, not corn. If you have any other questions on capacities/specs, let me know and I will provide them. HP don't matter since you are comparing pull-type. But, for the record, the early 7720s had 145 HP (466ci), the TIIs had a 165 HP (466ci) option. The first 9400 had 165 HP (359ci), after 91 or 92 the 9400 had 185 HP (414ci), and the 9410 and 9450 had 190 HP (414ci).
Asking if a 7720 will outcut a 9400 is like asking if an 8820 will outcut a 9600. Duh.
Jordan, yes, we still run the 9410 and probably will for a long time, as we don't plan to expand acreage. We did a first rebuild on it after wheat harvest in 2005 at about 1400 sep hours. After this fall harvest it has over 2000 sep hours. It has been a super reliable machine. Located in east central Kansas, we cut wheat (up to 65 Bu/acre), milo (up to 100 bu/ac) and soybeans (up to 35-40 bu/acre). The only reason we would replace it would be to for more capacity.
The next question we have asked ourselves is, if we wanted more capacity, what would we get? We would buy used because probably the smallest new machine would be a 9570 STS, and could not be justified financially. So it would be a 96xx walker or later 2388 for the higher horsepower. Anything in between would not be worth the step up.
I agree, Motram5455, I would not push the 414 in the 94xx anymore. If I wanted more power, I would go to the 95xx, that is what mother deere invented it for. The 94xx is a great small grain combine. If I was cutting 200bu corn or heavy soybeans, I would go straight to the 95xx. We have never been short of power in our 94xxs, but we are cutting dryland wheat and milo, low yielding soybeans.