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PTO RPMs

A

Anonymous-0

Well-known Member
I have a 1953 Allis Chalmers WD and I'm wondering if the PTO RPMs change with the engine speed. My manuals say it turns 540 rpm but is that at idle or full throttle?
 
Yes, it varies with engine speed. If tractor has no tachometer, working speed is probably about 4/5 of full throttle, or so. About the only implement where PTO speed is really critical is baling, and most of the older balers wanted 60 beats per minute. So real easy to adjust speed to one beat per second while looking at your watch.
 
Yes, it varies with engine speed. If tractor has no tachometer, working speed is probably about 4/5 of full throttle, or so. About the only implement where PTO speed is really critical is baling, and most of the older balers wanted 60 beats per minute. So real easy to adjust speed to one beat per second while looking at your watch.
 
That 540rpm is a magic number and so it does in fact varies with engine speed. It is used as a ball park number so as to have equipment made for either one of 2 PTO speeds which are the 540 and the 1000rpm. They had to use some number so the 540 was picked for some reason and with most tractors a tad over half throttle is where you hit the 540
 
I have a leaf shreader with a bad 5hp briggs on it. I thought it would be neat to run it off my pto. The briggs according to a website runs about 3600 rpm so I will need a bigger gear off my pto shaft and a smaller gear on the shreader shaft. Im gonna connect the gears with #35 chain but not sure what size gears to use.
 
Those are not gear but sprockets. Gear run teeth to teeth but sprockets run with a chain on them.
That said if you have one sprocket with say 40 teeth and the other with 20 that will increase you speed by double so all you have to do is go from there to figure out what you need. So you will need something close to 6 to one. I.E. 6 teeth for every one on the smaller sprocket would get you close
 
540 RPMs is acheived by close to wide open throttle. There is rated load speed and no load speed when you dyno a tractor. Most tractors DONT acheive 540 rpm at a touch over half open.
 
PTO speed does in fact change with engine speed. I.E. if the engine is spinning at 400rpm the PTO will be turning a whole lot slower then it will be if the engine is turning over at 1800rpm so yes engine speed effects PTO speed
 
WD45 is governed at 1725 high idle (wide open) rpm. 540 pto speed is reached at slightly fewer engine rpm- little over 3/4 throttle. Different tractors are governed at different speeds, but 540 pto rpm is commonly just under wide open. All depends on internal gear ratios.
 
Go run a hammermill with a WD, then see if you can say that with a straight face.

Maybe you should actually operate a tractor before you comment.
 
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