Chopper question
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=205931
Printed Date: 26 Jul 2025 at 11:45pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Chopper question
Posted By: im4racin
Subject: Chopper question
Date Posted: 18 Mar 2025 at 8:53pm
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What is the recommended hp for the 720 and 780 choppers?
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Replies:
Posted By: DiyDave
Date Posted: 19 Mar 2025 at 4:36am
70 to 95 HP, per Swinford's book...
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Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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Posted By: DrAllis
Date Posted: 19 Mar 2025 at 6:34am
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On page 5 of my official One-Eighty advertising literature book, dated 1969, I have a pic of a 780 chopper chopping hay, being pulled by a One-Eighty diesel. I think you could pull it with a WD-45, but it would be slow going and the more full you kept the chopping knives the better it would perform.
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Posted By: WF owner
Date Posted: 19 Mar 2025 at 1:46pm
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My Dad used a WD45 (biggest tractor he had) on his new 780 with a (6' ?) direct cut and one row corn head from the time he bought the chopper new (~1969) until he bought his One-Eighty new.
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Posted By: im4racin
Date Posted: 19 Mar 2025 at 6:18pm
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There is no way to run my 780 on such a small tractor. It has 1000 pto
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Posted By: Tenn allis
Date Posted: 20 Mar 2025 at 8:14am
A 200 with dual shaft would work great we pulled a 1 row for several years with a 200
A 185 with dual shaft will get you by but if your trailing a good sized wagon behind it can be a load going uphill or trudging thru wet ground
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Posted By: ac-mike
Date Posted: 21 Mar 2025 at 11:17am
Had the pleasure of running a 780 for years. I have used many choppers and believe the AC 780 was one of the easiest to pull. Its downfall was the head attachments, they only worked well in ideal conditions. I first pulled it with an AC 180, it was a good match. The available HP was about the most the chopper could use on a level run. Around here there are not many level runs! We pulled 14' boxes with third beater extensions and roofs on top, when these were getting full it was taking a lot of HP to pull all this on soft ground up hill and run the chopper also. We than upgraded to a AC 200, we soon learned this was all the power the chopper could handle, the feed rolls could not get any wider and would occasionally jam. This chopper gave us problems because it was a cut and throw instead of a cut and blow. Never had any problems with corn but alfalfa was something else. It would not throw it past the beaters on the wagon. I studied the operators manual and made the adjustments to the pan that directed the flow and could get it into the wagon a lot better. I could tell more stories about this but I will stop here. Still love AC!!!!
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D-12III, 200D, 170G, HD-3, D19D 3pt, D17D High Crop, WD45G p/s, D15IID, D15IIG, D15G IND, 655, (3)WD45D p/s, 700, 816
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