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Post hole diggers are one of my favorite tools to use with a tractor. I use them for planting trees, burying deceased elderly pets and occasionally for putting in posts. They're a little unique to hook up to a tractor, and, if you don't have a stand like I have to hold the thing upright while attaching, better get a buddy to help, especially if you're starting with the auger on the ground. Post hole diggers are really top heavy. That big gearbox is the heaviest part and it's the highest component. They want to fall on you while you're installing them on the tractor and they can mash a finger really quickly. I highly recommend you get a stand like I have before attempting to put one on your tractor. I have a video with the dimensions.
Anyway, post hole diggers are one of the few attachments that don't require a top link. The main frame goes where the tractor end of the top link normally goes, Hook that up first. Then attach your PTO, then your lower link arms and you're ready to dig holes. I show all of that in the video.
One final thing, if you have a really small tractor and you've just purchased a post hole digger and are having trouble getting it on and what I show in the video isn't working I have some sad news. Not all post hole diggers fit small compacts and sub compacts. The three point arms don't extend out enough for hookup. I've encountered that multiple times in my equipment career, so if that's the problem I'm afraid I don't have a great solution.