Farmall 350 (and 300) throttle setting for 540 PTO rpm

rankrank1

Well-known Member
Hope to add a Farmall 350 (or possibly a Farmall 300) to my piddle collection at some point in the future.

I was just curious at what Throttle setting is 540 PTO rpm obtained on these?

Is it at Wide Open Throttle like my old letter series or less than WOT. (If anyone knows the exact engine rpm then I would appreciate that info).

Thx
 
Just run them wide open, unless the governor has been tweaked for 200 extra rpm. 540 rpm is a generalization that is not set in stone. If a driven device spins at 650 it will not self destruct unless it was on the way out to begin with. Running slower than 540 can do damage in that the device might not have enough inertia or speed to complete a cycle, or avoid plugging up. Setting the throttle to fun at the PTO speed results in lower than spec. RPM under load. Jim
 
If you find one that has a factory tach installed, it has a white line @ 1750rpm, that's the rated rpm for PTO work.
 
(quoted from post at 21:21:33 11/21/15) you can find that info on the nebraska tractor tests through tractorhouse, i'm sure it has it for the utilities

Very familiar with the Nebraska Test reports and that info is not in there. In the mid 1950's the Nebraska test standard was still the flat belt test. Have to wait till about 1959 or 1960 when the PTO test replaced the flat belt test. At that point forward then the info for 540 rpm (or later on 1000 PTO rpm for bigger hp stuff) will start being included in the Test reports.
 
This. And in order to get mine to run 1750 my throttle is wide open - and beyond. That's with new(ish) governor springs.
 
I posted the engine RPM for 540 or close in a post below. Only difference a higher RPM makes comparing a Utility to a Farmall is how much faster than 540 one will spine the shaft than the other. Both use the same drive gears for the same type PTO. Here it is in black and white and the RPM fits Farmalls or Utility. Ground speed will be different because this is a utility picture.
If it's a farmall the no load engine speed should be approximately 1925 RPM and full load 1750 RPM.
a206274.jpg
 
I just went and got my Blue Ribbon Servicemam's handbook for Engine Tune-up and specifications for Farm & Industrial equipment (GSS 1356) On Page 26 it listed the F-350 High idle speed (no load) at 1925 rpms engine speed and the PTO would be turning 595 rpms. Rated engine speed is 1750 and the PTO speed would be 541. These speeds are the same for the Farmall 300. The utility tractor has a different set of speeds.
 
F-300, Looks like IH didn't keep there specification numbers the same. Some agree with you and some are different.
Think someone mixed up on some and put the RPM for a different type PTO following the wrong PTO. Never checked to see which one matches on a tractor. Do have a original F-350 tach and think it has 536 at the 1750 line but would need to go look to be sure.
a206277.jpg
 
Follow up information. Looked at two F 350 with IPTO tachometers, one on tractor and one off. Both have 536 RPM at 1750 RPM. F 350 operators manual in the description part of instruments reads the IPTO tachometer has a mark indicating a PTO shaft speed of 536 RPM at 1750 engine RPM. Then at rear of manual in specifications it has a discrepancy. Says 541 at 1750 for IPTO and 536 at 1750 for transmission driven PTO with a T/A. Still has 541 at 1650 for transmission driven and no T/A
Original poster asking about Farmall throttle setting. Like others posted full throttle should do if IPTO.
Utility tractor with a 2200 no load RPM and a 2000 loaded RPM, if something would be real critical on maximum RPM maybe not full throttle.
 

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