Category 1 3pt hitch specifications

Jarrett · Sep 14, 2005

I've done some searching and can't seem to find what the standard specifications for a 3 point hitch are. What I'm looking for is the distance between the lift arm pins and the height of the toplink pin in ralation to the lift arm pins. I'm planning to build a 3pt hitch receiver and just want to make sure I get the dimensions right. Does anyone have those dimensions or can you tell me what dimensions you used?

Soundguy · Sep 14, 2005

The 7/8" lower link pin spacing is 26" and the 3/4" upper link pin is 20" perpendicular to the lower link .

Soundguy

JerryG · Sep 14, 2005

I didn't double check but I thought that is was 18" not 20"?

Soundguy · Sep 14, 2005

Could be... that's from my 8n manual.. which was technically 'pre' cat1, even though AFAIK, the ASE adopted the ford spec as the cat1 spec.. etc. I'd double check it.. but um.. all my books are ford /forums/images/graemlins/grin.gif, except the JD, IH, and Allis chalmers.. . and none of them have 3pt hitches. My NH manual has the cat2 specs... /forums/images/graemlins/smirk.gif

Soundguy

JerryG · Sep 14, 2005

I never thought about it changing since the beginning of the three point. I just looked in my manual and it shows the bottom width at 26.8" and the top pin height at 18". But as we all know manufactures especially short line manufactures take quite a bit of liberty with specifications. /forums/images/graemlins/mad.gif

Soundguy · Sep 14, 2005

Another thought that crossed my mind... The 8n had a '3' hole toplink rocker... most tractors nowadays have only one toplink rocker mount point, unless they also have draft control I wonder if / how those attach points figure in.

I just did some quick online browsing.. quick hitches.. etc... seen 26.5" and 21" .. so far still looking...

Soundguy

MadReferee · Sep 14, 2005

Soundguy was close, but no cigar. /forums/images/graemlins/grin.gif

Here is a published spec from TractorSmart.com. Scroll to the bottom of the page.

3pt hitch specs

JerryG · Sep 14, 2005

I don't know if the three holes figure in or not. Mine does have the three holes. I think the 26.5" is the one that I seen quoted the most. Isn't the 21" for Cat. 0 or was that one 18"?

JerryG · Sep 14, 2005

I think it just depends on where you look as to the numbers. Someone posted the ASAE standard a year or so ago, but I lost it.

Soundguy · Sep 14, 2005

( think it just depends on where you look as to the numbers. Someone posted the ASAE standard a year or so ago, but I lost it. )

Me too. Just noticed the asae has now changed some weblinks and archived alot of previously posted/searchable data... gives you free preview.. but no download priveleges..

I'll see if I can find something more up to dat than 53 years ago /forums/images/graemlins/ooo.gif tomorrow!!!

Soundguy

MadReferee · Sep 15, 2005

It's interesting. All I have ever seen published are exactly what TractorSmart has only with the cat 0 and cat 3 blanks filled in.

However, very few manufacturers follow that spec. I have implements from Midwest, Landpride, and Pronovost and none of them are within even 2" of several measurements. About the only thing in common is the lift pin and top link pin diameters.

Now, every implement that I have built (about 10 of them) conforms to the spec within 1". Although I am not a mechanical engineer, I believe that following the spec would give you maximum load and stability efficiency from the 3pt.

rswyan · Sep 15, 2005

Try this:

3-point Hitch Specs

Soundguy · Sep 15, 2005

( However, very few manufacturers follow that spec. I have implements from Midwest, Landpride, and )

Yep... I hit landprides site.. they had a small writeup on their quick hitch... Apparently the 'suitability' drops of fthe older' you get on the implement... I.e. they are built on the 'small' side of the spec...

When i build stuff for my 3pt.. I generally just start with a 3pt drawbar as a base template and go from there. Few things a 'mission critical' when you are working give or take an inch on the toplink connection... just make sure the geometry and range of motion works and that the toplink doesn't strike the implement at max lift.. etc.

Soundguy

chadincolo · Sep 15, 2005

Do you want to know implement specs, or quickhitch specs? Let me know, all ASAE specs are on my shelf, would take about 5 mins to look up for you.

Jarrett · Sep 16, 2005

I guess both. Whatever you have would be great.

Thanks guys!

chadincolo · Sep 20, 2005

Sorry, I got busy and didn't get back as soon as I wanted.
Let me know if you need any clarification on the terms or what the measurements are for.

Quick hitch spec, ASAE cat I
Lower socket inside span 27.03-27.15 in
Lower socket width 1.10-1.16
Upper hook verticle spacing 14.78-14.88
Upper hook width 1.25

Three point implement spec, ASAE cat I
Lower hitch pin span 683+-1.5mm (26.89+-.059 in)
Mast height 460+- 1.5mm (18.11 +- .059in)