lzicc
Platinum Member
I only wanted to buy one auger so I bought the 12". I wouldn't go any smaller than a 9" for anything unless you can be very exact when making the hole. You need to allow room to give yourself some adjustment of the post.
I have a 12" and it works well for 6x6 posts and rr ties. IF I did a lot of smaller posts I would get a 6 or 9.
As far as the "down force kits" I am of the belief that they do little to nothing. The 3 point hitch floats so the lower links can't push down and I can't tell a difference when I engage the down force cylinder. IF it was really doing something you would feel the tractor try to lift when it engaged like what happens when you push down with the FEL. Simply extending that cylinder can't really do much IMO as the only down force is really the weight of the post hole digger which does not change by simply extending a cylinder. IF you want down force get a hydraulic auger and put it on the FEL.
Downforce kits for the 3pt PHDs only provide a few hundred pounds of force, not enough to lift any cat 1 tractor I'm aware of. They don't look right, but if you can visualize the leverage you'll see how they work.
A loader/bucket mounted hydraulic unit is superior though, at well over double the price of a good 3pt unit with a downforce kit. Better downforce & reverse when you corkscrew.