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 | brokenarrow
Join Date: Jan 2004 Posts: 1288 Wisconsin 
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2004-04-26 84444
Would anyone here know off hand the distance between the liftarms and the usual distance in height from the horizontal between the lift arms and the top link? Kinda like the add just to the right of this screen (flex points)?
Thanks
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2004-04-27 84455
I think that distance is part of the standard hitch definitions. It's here in the archives somewhere. I think Mark may have dug it up. I believe it's a fairly important measure because some implement top-link heights are built assuming a standard 3ph height. A different height and an implement may not keep as constant a level as the 3ph goes up and down. ....
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 | beagle
Join Date: Jan 2004 Posts: 1333 Michigan
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2004-04-27 84458
I believe the dimensions are as follows if I understand which you are looking for:
Cat 1 Hitch
26" between lift arms
20" from lift arms at level to the center of the top link
Cat 0 Hitch
20" between lift arms
16" from lift arms at level to the center of the top link
Again, just from memory, I think it is 14" from the end of the pto shaft to the center of the lift arms. ....
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 | kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon
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2004-04-27 84459
It seems there IS no standard for Cat-1 top link heights. It seems they range from 15 inches for I-Match compatible implements up to 20" or so. ....
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| kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon
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2004-04-27 84462
Here ya go. Go to tractorsmart, click on Technical Info, click on Tractor Three Point Lift Types, and scroll to the bottom of the page. It says that the Cat-1 vertical height is 18", which seems to be a sort of standard, but in practice that dimension varies widely. ....
Link: Tractorsmart
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2004-04-27 84463
Ken is right..... but 20 inches is too much for my new top and tilt. That is asking for a bent top link. 15 inches works just about right.
The actual spacing on my 4115 is 14.75 inches. ....
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 | Billy
Join Date: Oct 1999 Posts: 975 Southeast Oklahoma 
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2004-04-27 84467
The standard is not to have a standard.
Out of the four implements I have only one that has a vertical height of 18". That one is a JD 616 rotary cutter. That's even changed now, with the invent of the I-Match.
....
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| kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon
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2004-04-27 84473
20" is too much for my top-and-tilt too. 18" is about the max it can handle. ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2004-04-27 84476
I just remeasured..... it was an 18 inch span that bent my top link. I have reduced it to 14 inches. ....
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| beagle
Join Date: Jan 2004 Posts: 1333 Michigan
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2004-04-27 84502
I gotta remember not to trust memory like I used to. It's the second thing that goes, right.
But top link vertical spacings do vary a lot, depending on the size of the machine. It will effect how the inplements levels without changing top link length. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2004-04-28 84558
Thanks guys! Guess the vertical distance between lower and top links isn't part of the standard. I don't suppose it makes any difference if the post I remembered or my recollection of it was off. Always happy to learn something.
I'm thinking that the closer the 3ph and implement distance between the links are the more constant the implement level would be. Equal distances should make a parallelogram configuration. I think I'll see how close to a parallelogram my box scraper makes the next time it's on. That might be an explanation for why I'm almost constantly on the top-link control when grading. Of course, if the cut did increase as the 3ph raised it might tend to cut the tops off bumps and gouge the dips less. ....
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| Mecheng
Join Date: Posts: 1 
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2004-04-28 84594
Have any of you retired rocket scientists roughed out a kenamtic equation for this motion? Is the lift arm and top link pivot axis the same distance apart for various make tractors? With some MFG data the equation would be a piece of cake to calculate. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2004-04-28 84604
Actually Mecheng it's NOT a standard distance between manufacturers.
In fact in some cases it varies between MODELS of the same manufacturer, and to make it even more complicated still, there is normally 3 positions in which the toplink can be connected to the tractor.
Just in case that didn't make enough of a mess of the whole affair, there is also the fact that the upper link pivot and the pivot point of the lower arms differ, sometimes dramatically in the fore/aft plane, this of course makes a big difference in the arc they move in.
The bottom line is that this, as my Professor used to say, "This is a clear cut case of an instance where the Schindler Shaft and the Sport Flange cannot relate in a physical sense, and if they did they resultant load on the keyway would far exceed the design criterion causing an almost certain failure in the Foofoo valve, this in turn would cause us to have to change subjects or just move on."
Or in Layman's terms, "You can't get there from here.".
He didn't teach us anything different than any of the other Professors, but he sure was a lot more INTERESTING to listen too.
Best of luck. ....
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| brokenarrow
Join Date: Jan 2004 Posts: 1288 Wisconsin
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2004-04-30 84826
THAKN YOU ALL!!
Great answers, I now can get started on my (next Sat.) project.
Would you all say that the hitch/reciever is a nice add on to a collection or is it just a dust collector? I do have a trailer (for fire wood) and a few boats but not much more for ball type hitches. I was thinking I would use it alot, but maybe I am over estimating it. One more thing, if you were making it is there any other add on you would fabricate into the design for useful other items?
Thanks again ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2004-05-02 84966
I have a 2 inch receiver bolted to the bottom of my ballast tray..... basically a 24x48 lipped platform on a set of carry-all forks. It holds cement blocks in the winter and a 70 gallon water tank in the summer.
The ballast weight keeps it from "floating". I also have a 2inch receiver on the FEL so I can pull/spot trailers without having to remove the backhoe. ....
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| texbaylea
Join Date: Feb 2004 Posts: 51 Brazos County, Texas
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2004-05-02 84969
Mecheng; When I have time I might tackle it. I believe I have seen where some one has already worked out an Excel spreadsheet to do this but I don't remember where on the web it was. I did not download it at the time, sorry. ....
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