Quote Originally Posted by jenkinsph View Post
It is certainly possible that some might be setup for less than 15 inches bu the vast majority of equipment is set up for 18 inches vertical height on category 1 implements. If you measure from the bottom of the hooks on the lower quick hitch to the bottom of the top hook it should measure 15 3/32 inches. You can lay a straight edge in the lower hooks and measure this easily enough. The extra 3/32" is the difference between the pin diameters but this still works out to 15 inches center to center.
I have some older implement that were made probably before a quick hitch was thought of but they still work.

Quote Originally Posted by jenkinsph View Post
If I have an implement that doesn't fit the quick hitch I make it so. I am not about to go through getting off the tractor all the time and adjusting the hook up and down.
Me neither, that defeats the purpose of a QH.