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Belt Pully speed

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plough-boy

09-08-2000 13:49:52

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What is the belt pully speed as it relates to the engine RPM? Is it 1:1? I'm specifically interested in the LA and L but it should be the same ratio I would think for all tractors.

Thanks

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09-08-2000 19:32:58

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Re: Belt Pully speed in reply to plough-boy, 09-08-2000 13:49:52

If the pulley is on the crankshaft it is the same as the tractor RPM. Some tractors, like the H have the pulley elsewhere. The H pulley is on the cam if I'm correct.

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Pat

09-09-2000 02:38:22

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Re: Re: Belt Pully speed in reply to DP , 09-08-2000 19:32:58

On two-cylinder John Deere�s, (A, B, etc) the belt pulley turns at crankshaft speed except for the H, which turns at camshaft speed. On tractors with longitudinal engines, the belt pulley is always powered through a gear train, and may not turn at exactly engine RPM. If you need to know for belt work, the more critical question is the belt speed at rated RPM. With that, you can determine how big a pulley you need on your saw, grinder, or whatever.

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Stan (again)

09-09-2000 03:50:15

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Re: Re: Re: Belt Pully speed in reply to Pat, 09-09-2000 02:38:22

I think I figured out the math - at least I get pretty close to what the sales brochure said:

First, you really have to know what rpm the belt pulley turns at, and I don't know where you find that out unless you can put a tachometer on the pulley somehow - maybe you're even lucky enough to have one of those old revolution counters lying around. The math is as follows:

1) Multiply the diameter of the pulley (in inches) times that old reliable algebra term Pi (3.14159)to determine the circumference (in inches)of the pulley
2) Multiply the circumference times the rpm of the pulley to determine how many inches per minute the pulley is turning
3) Divide the pulley speed from that caluclation by 12 to get feet per minute.

When I did that on the A numbers from the brochure I got 3255 as opposed to 3270 in the book. The B numbers came out to 3170 as opposed to 3110 in the book.

Sure hope I'm right, but I'm sure I'll hear about it if I'm not.

Stan

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Stan

09-09-2000 03:30:52

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Re: Re: Re: Belt Pully speed in reply to Pat, 09-09-2000 02:38:22

There must be somebody out there in John Deere land that knows the math to figure out belt speed. I have a sales brochure on the A and B tractors from 1947 that gives the following information:

Model A - Engine speed = 975 rpm; Pulley diameter = 12 3/4"; Pulley rpm = 975; Belt Speed (feet per minute) = 3270.

Model B - Engine speed = 1250 rpm; Pulley diameter = 9 11/16"; Pulley rpm = 1250; Belt speed (feet per minute) = 3110.

There is, no doubt, some algebra (one of my worst subjects in high school) involved in figuring belt speed - can someone give us the formula?

Stan

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Plough-boy

09-09-2000 12:36:28

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Re: Re: Re: Re: Belt Pully speed in reply to Stan, 09-09-2000 03:30:52

Thanks for the help! Guess I need to start looking for some technical documentation for my LA or L. I do know that the rated RPM is 1550, but it sounds like we're not sure the ratio on a JD in-line engine tractor such as the LA is.

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