Wow, lot's of activity on here since yesterday! :thumbsup: I'll try to catch up...
Okay, I got some answers yesterday and cleared up all this confusion. First of all, the bushing's I linked to are not Cat 1 to Cat 2 bushings, they go directly from Cat 1 to Cat 3, the Landpride QH has cat 3 sized lower hooks, with 1.5" inside diameter. The bushing I ordered have an inside diameter of 7/8" (cat 1) and outside diameter is 1-7/16" (cat 3)
I double checked the parts I ordered through Amazon, and found on the Northern Tool website the dimensions, from a Northern Tool rep. Then I called Landpride directly and spoke to a tech rep. Funny thing is, I told him I had another question regarding the Quick Hitch, he said, "Is this Matt?" :laughing: I think that means I'm calling Landpride too much lately...
I asked him some of the questions that we have all been pretty confused about, and wrote down some answers, I'll post them below....
"Why are the lower hooks oversized for category 1 implements, and not just sized at 7/8" to begin with?"
There are a couple of reasons, one of them being that not all cat 1 implements have exactly 7/8" pins, some have cat 2 pins, and some have "homemade" pins which a lot of farm implements are. Another reason is that it may be too "snug" of a fit for anything but the "perfect situation". Any implement trying to be picked up at a bit of an angle, or an implement that has slightly bent pins from hard use, wouldn't be able to engage into the "perfectly sized" lower hooks of the quick hitch.
The hooks are sized larger than they need to be, to make hooking up to implements much easier, and allows for these "errors" or "less than perfect" situations. The downside of always having all this "room" available in the lower hooks, is that without any type of bushing, there is a lot of "slop" or "play" in the connections. Lot's of room for that pin to move around in the big lower hook.
You can tighten up the slop by using bushings, as we know. They leave you the option of which bushing to use, based on how much "slop" is acceptable, verse how easy the QH engages the pins of the implement. If your okay with a lot of slop (some implements don't really need to be perfectly engaged) then you don't need a bushing, and it will be simple to hook up, rarely having to adjust anything.
However, if you want a tighter fit, but still don't want to worry about being "perfectly" lined up, then you can use a cat 1 to cat 2 bushing.
If you want the "best" fit, as he worded it, you use a cat 1 to cat 3 bushing, and it results in an almost "perfect" fit, with any slob in the hitch going unnoticed and making no practical difference. (Only 1/16th of an inch slop).
You can use either a 1 to 2 bushing, then a 2 to 3 bushing over it, or you can use the cat 1 to cat 3 bushings.
He said that Cat 1 to Cat 3 bushing's are "ideal" for a tight fit and no slop.
The bushings have nothing to do with wear on either the QH or the implement pins.
A cat 1 to cat 2 pin, will take up 88% of the "slop" and still provide a good fit, while making it slightly easier to "engage" the pins to the QH. These bushing's are also cheaper, and more than likely, we wouldn't notice much of a difference between the "good" fit of the the cat 2 bushings, and the really tight fit of the cat 3 bushings.
All this info above, is good ONLY for the Landpride QH 15 quick hitch. I hope this clears it up, this straight from the "horses mouth."