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Discussion Forum

Allis 7580

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m kuhns

05-03-2002 19:45:21

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A friend of mine has a 7580 Allis 4WD articulated tractor. WE think it blew a hole in a piston because it has a mess of blowby that suddenly showed up. He might overhaul the 426, but what needs to be changed or done to put in a 505 Cummins. How much Hp and torque can the 8 SPD trans and rears handle safely. If he puts in a Cummins, he would like to run about 250-275Hp.
An input would be appreaciated. THANKS!

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05-06-2002 09:15:05

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 Re: Allis 7580 in reply to m kuhns, 05-03-2002 19:45:21  
Keep in mind that the 7580 and 7080 have about 90% interchangable parts. I have a neighbor who ran his 7080 for 5 years at 270hp and tore it up. The Cummins retrofit is 10-15k, the 670HI OH should top out at 7k. And more than 220 pto hp is not recommended on the engine or drivetrain. Have the pump and nozzles set to the 4W220 settings(aka slow the rpms down) if you rebuild and it will last much longer.

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m kuhns

05-05-2002 18:07:03

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 Re: Allis 7580 in reply to m kuhns, 05-03-2002 19:45:21  
What about a 4W220? Does it have the same rears, transmission, and driveline setup as the 7580. It is rated at 220Hp. Why were the driveshafts always flying apart or a weak point.

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Craig MO

05-05-2002 18:52:34

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 Re: Re: Allis 7580 in reply to m kuhns, 05-05-2002 18:07:03  
These were not the same. The drive shafts particully pto shaft on 7580 were what you really had trouble with. We found that if you balance driveshafts from 0 to 15 degrees angle you did not have as much trouble.

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05-08-2002 13:52:31

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 Re: Re: Re: Allis 7580 in reply to Craig MO, 05-05-2002 18:52:34  
The pto drive shaft was slowed way down on the 4W series tractors, and did not have near the trouble. The 4W220 was rated at 220 engine HP, the 7580 was 185 PTO HP. They equal about the same.

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Craig MO

05-03-2002 20:36:35

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 Re: Allis 7580 in reply to m kuhns, 05-03-2002 19:45:21  
Sounds like you dropped a valve or blew a tip. Personally I would fix old motor even if I only did on hole. Cummins repower kits are pretty expensive and not worth the cost in my book. If you attempt to do conversion your self I wouldn't get a haircut for a while because you will probably need allthe hair you have. The 7580's had enough drive line troubles without incresing horsepower.

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05-04-2002 07:21:48

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 Re: Re: Allis 7580 in reply to Craig MO, 05-03-2002 20:36:35  
Scored piston, is my guess. 250 HP is way to much for that tractor.

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Denis Brodner

04-13-2006 21:50:51

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 Re: Re: Re: Allis 7580 in reply to DJ, 05-04-2002 07:21:48  
How did the 7580 stand up? Are they a reliable tractor or did they give a lot of problems?

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