PTO speed
- Thread starter rhoxie1
- Start date
mikehaugen
Elite Member
Normally the pto output (spline shaft) will run at 540 rpm when your engine is at "rated pto speed" which is normally just below redline. Some (most) tractors have that speed indicated on the tach. There are exceptions, and I am not familiar with your tractor.
I guess I need to rephrase the question. The manual states that at 1500 rpm is ,545 rpm at the PTO with the 1 1/8 spline. Now when using the 1 3/8 spline is it still 1500 rpm to turn the PTO at 540 rpm
Thanks Richard
Thanks Richard
Tor Arne
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Yes it should still be the same speed
5030
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Not exactly. PTO indicated speed on the tachometer isn't 'redline', it's the engine speed at which the greatest torque is produced. Red line is the maximum safe allowable, sustainable RPM without destroying the engine.
mikehaugen
Elite Member
Note, I said "normally just below redline."
5030
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Not true either, especially if it's a diesel engine. Diesels produce maximum torque rise (maximum work produced) well below maximum operating rpm. Not 'just' below.
A highly tuned race engine produces maximum work at maximum rated rpm but thats not a tractor engine, it's a race car engine.
Soundguy
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wow. hair splitting like crazy... 
just 'compair size' and lets get this guy going.
some old tractors didn't even come with tach's.. or if they did.. they no longer work. playing it by ear, feel, and look usually wins the race on these old girls.
just 'compair size' and lets get this guy going.
some old tractors didn't even come with tach's.. or if they did.. they no longer work. playing it by ear, feel, and look usually wins the race on these old girls.
Soundguy
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- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
to the OP
the drive end of the pto shaft. the part that goes into the tractor, is the same even if the external stub shaft is the old 1 1/8 or the sae 1 3/8
same deal on fords of that era with conversion shafts now available
the drive end of the pto shaft. the part that goes into the tractor, is the same even if the external stub shaft is the old 1 1/8 or the sae 1 3/8
same deal on fords of that era with conversion shafts now available