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JD 50 pto speed

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Kerry Miller

09-25-2000 20:57:50




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How fast do I need to turn the engine on my JD 50 (1955 or so) to get the right rpm for implements? I don't normally turn a shredder 540 rpm anyway, but I thought when I was a kid I nearly ran ours wide open. I notice the shredder is turning pretty fast at only about 1/3 throttle. Where is 540 really? I don't have a tach so it's all relative anyway, but I'd expect it at about 2/3rds throttle.

I was disking tonight with my small (about 5 or 6 ft) disk, now that we've gotten a little rain it was digging great. I was pulling it in 4th gear about 2/3rds throttle but on the second pass had to go down to 3rd gear. I noticed when I shut it down (after dark, I got the lights working!) the exh. manifold was a little bit red but just barely so I guess I was pulling about right.

What about the PTO rpm? Approximately how fast do I need to run to get 540 rpm?

Tnx,
Kerry

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G Taylor

09-28-2000 19:37:21




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 Re: JD 50 pto speed in reply to Kerry Miller, 09-25-2000 20:57:50  
Deere designed the two cylinders to operate idealy at rated RPM under 80% load. This was for longitivity and fuel efficiency. Certainly some tractors have been worked at 101% load lugged to 80% RPM for years but not optimum. 1200 RPM can be found with three strips of tape stuck across the pulley face equaly spaced apart. Shine a flourescent reading lamp close to the rotating pulley in dim light. Tape will apear stationary at 600 and 1200RPM.

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Chuck

09-26-2000 18:24:40




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 Re: JD 50 pto speed in reply to Kerry Miller, 09-25-2000 20:57:50  
little confused about the term wide open. This might be a phraze for an auto. The tractor should be operated at governed speed under load. This will prevent your tractor from lugging and overheating.



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Stan

09-27-2000 03:33:17




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 Re: Re: JD 50 pto speed in reply to Chuck, 09-26-2000 18:24:40  
To me, the term "wide open" means the same as the more modern term "pedal to the metal". There are stops on any throttle lever/pedal/whatever, and they are designed to limit the engine speed to governed rpm under load.

The trendy term being used these days by some of the trendy chefs on TV is "kick it up a notch".

Stan



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Edwin

09-26-2000 10:06:55




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 Re: JD 50 pto speed in reply to Kerry Miller, 09-25-2000 20:57:50  
If recall correctly the manual says to run the PTO with the throttle lever in the straight up position. (about 2/3 open) I have a 5 ft rotary mower on my 50 and that seems to be a comfortable setting for it even in heavy grass.



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kerry

09-26-2000 11:36:59




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 Re: Re: JD 50 pto speed in reply to Edwin, 09-26-2000 10:06:55  
That sounds about like where I've been running it, 1/3 to 1/2 throttle. I sure thought we ran our old one faster than that, but that was 28 yrs ago. Also, it might have something to do with the fact that when I was 12 I ran everything wide open...

How about plowing, where do you guys run them then?

Kerry



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Mike Aylward

09-26-2000 12:32:34




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 Re: Re: Re: JD 50 pto speed in reply to kerry, 09-26-2000 11:36:59  
Kerry, for any kind of heavy work open that tractor up! It was designed for this. Rated speed on the PTO is figured at wide open on the throttle lever (1250 RPM) To run a disk, a plow, or whatever would put a load on your tractor, open it up. Your tractor will like it better. Hope this helps. Mike



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Edwin

09-26-2000 10:05:37




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 Re: JD 50 pto speed in reply to Kerry Miller, 09-25-2000 20:57:50  
If recall correctly the manual says to run the PTO with the throttle lever in the straight up position. (about 2/3 open) I have a 5 ft rotary mower on my 50 and that seems to be a comfortable setting for it even in heavy grass.



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Stan

09-26-2000 03:02:38




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 Re: JD 50 pto speed in reply to Kerry Miller, 09-25-2000 20:57:50  
Kerry,

I remember running our '49 A and '52 B tractors wide open to run everything, especially PTO machines. I just looked at a brochure on the 50, 60 and 70 tractors and it talks about engine speed of 1250 and PTO speed of 540. I think wide open would be the right speed. Now all you need is one of those little revolution counters that you put on the end of the PTO shaft (and a watch that has a second hand). Maybe even a digital watch, eh?

Stan

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OCB

09-28-2000 18:58:52




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 Re: Re: JD 50 pto speed in reply to Stan, 09-26-2000 03:02:38  
at 1250 RPM, the transmission PTO speed is 541 and the LIVE PTO is 532 rpm. I have a JD Bush Hog the blade turns at about 800 RPM and wide open goes a great job.



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Kerry

09-25-2000 21:00:57




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 Re: JD 50 pto speed in reply to Kerry Miller, 09-25-2000 20:57:50  
Just for grins and bragging rights, we hooked a friend's 8N to this same disk. In low gear he had the throttle wide open, it was lugging and smoking and would barely even move it! To be fair, it just rained 1/2 inch yesterday so it's digging about as well as a small disk could ever do. He wasn't a happy camper when I took off in 4th gear with it!

Kerry



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