Allis Chalmers 7080
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=210682
Printed Date: 09 Apr 2026 at 3:00pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis Chalmers 7080
Posted By: acplowboy45
Subject: Allis Chalmers 7080
Date Posted: 08 Apr 2026 at 8:46pm
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Looking at a 7080 and was hoping someone could tell me if the 7080 had rear end troubles. Also how can one tell if the power director shifter is bad without hooking up gauges. I have read don't run them hard about 2200-2300 rpm is all you need no higher. Is that correct. Appreciate any input.
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Replies:
Posted By: DrAllis
Date Posted: 08 Apr 2026 at 9:46pm
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Not known for rear end problems. I could drive one for 15 minutes without gauges and tell you if the Power Director clutch is good or bad. 2800 RPM is bad. Less is better, correct.
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Posted By: Lynn Marshall
Date Posted: 09 Apr 2026 at 7:50am
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I certainly wouldn't fear the rear ends or the power director either. The power director had an extra plate in the low side and maybe another one in the high side? The torque limiter would need to be in top shape. The engine was probably the weak link. If left in stock settings and properly serviced, they should last a long time. Turning them up shortened their life. Question for Doc or Injpump Ed, with a stock pump setting, what kind of horsepower would you see at only 2300 rpm. I would think that 2500 or so would be comfortable for the engine and still have somewhat adequate horsepower.
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Posted By: DrAllis
Date Posted: 09 Apr 2026 at 9:25am
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It's been many years since I've had one on a dyno, but if I remember right, when you pulled one down below 2550 RPM rated speed, the needle on the dyno just kept coming on around !!! I'll bet it would have still had 160 HP or better @ 2300. Maybe 170......
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Posted By: 8070nc
Date Posted: 09 Apr 2026 at 10:25am
If you get the tractor id put a new torsional damper on the front of the crank. I could say why i recommend that but it would be a long story
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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