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Allis Chalmers Discussion Forum
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WD45 Allis/DC Case

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Glenn FitzGeral

09-15-2004 12:05:36




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We have owned and used some Allis Tractors in the past and have been very impressed. I have a question...Why are tractors not all geared the same at the PTO? A DC Case or a WD45 will do a pretty impressive job on the blower largely due to their highly geared PTO's. For example, why is the MM U geared so low? It is geareed too low to utilize its horsepower blowing haylage. One of my favorite things to see is our '51 DC Case blowing haylage op our 80' silo at night...rear wheels jumping, governor opened up, muffler cherry red half way up...load after load. Our WD45 Allis neighbor has a similar story to tell.

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steve(ill)

09-15-2004 18:43:10




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 Re: WD45 Allis/DC Case in reply to Glenn FitzGerald, 09-15-2004 12:05:36  
are you talking about ground speed in 1st gear? the pto shaft speed of all old tractors should be 540 RPM at "rated speed", so the PTO shaft will turn 540 RPM when tractor is at its normall high speed operating point. this could be 1600 RPM, 1800 RPM,etc, depending on what tractor you are running.---- on the other hand, some tractors are geared to move 2 MPH in first gear, some 3 or 4, etc. depends on the company that built it and their opinion of its intended usage.

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Eric Rylander

09-18-2004 19:58:27




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 Re: WD45 Allis/DC Case in reply to steve(ill), 09-15-2004 18:43:10  
I think what Glenn is trying to say is the DC Case and WD-45 seem to have the point of 540 PTO RPM right in the peak of the engine's torque curve, and that on his example of a MM "U" it is not.

540 PTO Rpm is not always at full engine rated RPM on all tractors- I recall running both a JD 70 diesel and an Oliver 660 with tachs showing a line for "540 PTO RPM" and it was a couple hundred below wide open.

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Doug in OR

09-19-2004 19:05:21




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 Re: WD45 Allis/DC Case in reply to Eric Rylander, 09-18-2004 19:58:27  
Yes, but wide-open here meant the RPM under no load. A "couple hundred" on most tractors means very little. The exception is the JD. With a rated RPM of.. say 900 RPM, 200 less RPM becomes significant. I suspect the difference wasn't that much on the JD. I never really paid that much attention to the tach whenever I was on a JD, though.



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