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John Deere Tractors Discussion Board

question about the differences in 404 motors

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Posted by tlock0331 on October 27, 2013 at 07:19:01 from (

Background - i have an opportunity to buy a 7020, motor got hot, a rebuild may be an option, but im not sure yet, but if a different motor is required then so be it. That is where the questions come in. The 7020 got a 404, the 7520 got the 531. But when looking at different models that carried the 404, i see a few differences such as a turbo, but for example, the 4020 is listed at around 85 hp, the 4620 is listed at around 135 hp, the 7020 is listed around 127 hp. I am not including combines, even though that could be an option.

So the question(s) now becomes, the 4020 to 4620 is a big jump in hp, the 4620 and 7020 were built at the same time, 10 hp difference, are these differences due mainly to injectors, or pump, or were there more differences? I know the compression ratios vary a little, but were cylinder heads modified as well? A friend of mine has a 404 out of a 4010 that i could get, but a 7020 with 85 horse, another option could be a 531 from a scraper, but i dont know if that would be an easy transition, even though the 7520 got them.

Help with the differences in the 404 would be great, i have searched, but havent really found anything concrete and i see a lot of knowledgeable new generation guys on here, hoping they can help.



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