Where to measure PTO shaft diameter?

Killscreen123 · Apr 15, 2019

Hey everyone!

I'm trying to buy an ORC for my 56 Ford 640 to use when I'm brush hogging my field. I want to be sure I buy the correct size to fit my PTO. I know the size is either 1 1/8" or 1 3/8", so I measured my PTO shaft yesterday. My problem is, where do I measure it from? When I measure the round part of the shaft (not including the splines) I get 1 1/8", but when I measure from the top of a spline to the top of the opposite spline, it is 1 3/8". What size PTO shaft do I have?

Thanks!

el6147 · Apr 15, 2019

1 3/8 , early Massey Fegusons and the " N " series where 1 1/8 .

Crazy Horse · Apr 15, 2019

This little video is more up to date than your tractor probably but watching it tells me that the measurement is made for the shaft diameter
(not the outer edge spline measurement). Lots of results if you Google something like Tractor PTO Sizes Measuring, etc.
Untitled URL Link

BarnyardEngineering · Apr 15, 2019

Measure the outside of the shaft.

Your tractor is too new by about 15 years to have the 1-1/8" PTO. After the early 1940's 1-3/8" is pretty much the standard.

It's also VERY obvious looking at them side by side. Think, "Wimpy wimpy wimpy! Hefty hefty HEFTY!"

old · Apr 15, 2019

The last Ford that used the 1-1/8 PTO shaft was either the 8N or Jubilee the 640 would have the latter 1-3/8 PTO. Or in other words your tractor has the 1-3/8 PTO shaft

Killscreen123 · Apr 15, 2019

Took some photos

Killscreen123 · Apr 15, 2019

Killscreen123 · Apr 15, 2019

Killscreen123 · Apr 15, 2019

Of course the photos won't post. Well, I went and measured it again and now my measurements seem way off. Spline to Spline i'm getting 1 1/4", and measuring just the round part of the shaft with no splines I'm at 1 1/16".

I bought a JD 503 brush hog for it. Both ends of the telescopic PTO shaft fit on the Fords PTO output shaft, as well as the input shaft of the mower. So I'm going to assume it's 1 3/8"? The JD mower cant be old than the 80s so the input shaft must be 1 3/8". It just sucks because I can't find an ORC anywhere in Canada, tried for months. So instead I have to order it from the states and if it doesn't fit i'll be $100 in the hole.

Ozlander · Apr 15, 2019

(quoted from post at 09:44:48 04/15/19) The last Ford that used the 1-1/8 PTO shaft was either the 8N or Jubilee the 640 would have the latter 1-3/8 PTO. Or in other words your tractor has the 1-3/8 PTO shaft

Yes, My Jubilee has a 1 1/8" PTO shaft.
My 861 has a 1 3/8" PTO shaft.

old · Apr 15, 2019

As I said the Jubilee/NAA where the LAST Ford to have the 1-1/8 PTO shaft then 640 has the 1-3/8 PERIOD

Thomas(AB) · Apr 15, 2019

Depending on what part of the country your in, ive found ORCs at Princess Auto and also at Peavey Mart

Pete in MD · Apr 15, 2019

They're available right here on YT.
1 3/8

Jim.ME · Apr 15, 2019

Should be 1-3/8" x 6 splines.

Killscreen123 · Apr 22, 2019

Thanks everyone! Jim.ME that diagram really helped, it looks like I have a 1 3/8!

Where to measure PTO shaft diameter?

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