> Craig wrote:
On Tue, 20 Nov 2012 13:03:17 -0600 Fmiser <fmi...@gmail.com>
wrote:
> PTO RPM is typically 540, as I recall, so 900 RPM is a bit
> fast.
There are two standard PTO speeds now, 540 RPM and 1000 RPM.
Yeah, I heard that. But this was prior to 1933. So what was
PTO speed then?
-- Philip
540 It predates the F20 and farmall regular.
From wikipedia Power take off:
History
Experimental power take-offs were tried as early
as 1878, and various homemade versions arose over
the subsequent decades, but International
Harvester Company (IHC) was first to install a
PTO on a production tractor, with its model 8-16,
introduced in 1918.[2] Edward A. Johnston, an IHC
engineer, had been impressed by a homemade PTO
that he saw in France about a decade before,
improvised by a French farmer and mechanic
surnamed Gougis.[2] He and his IHC colleagues
incorporated the idea into the 8-16, and designed
a family of implements to take advantage of the
feature. In 1920, IHC offered this option on
their 15-30 tractor, and it was the first
PTO-equipped tractor to be submitted for a
Nebraska tractor test. The first PTO standard was
adopted by ASAE (the American Society of
Agricultural Engineers) in April 1927. The PTO
rotational speed was specified as 536 ± 10 rpm;
the direction was clockwise. The speed was later
changed to 540 rpm.[3] The PTO was a competitive
advantage for IHC in the 1920s, and other
companies eventually caught up with PTO
implementation.
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