I decided to bring this thread back to life now that I've had a couple days to get started on the Post Hole digger mount to QH mode. For all those that advised me of the geometry problem, Thank You. It will not work without using Hydraulic Top Link. On mine I would loose about 18" of travel without moving the top link.
First came the top link, I did this a few months ago. I modified a short grapple cylinder that I had laying around, used a rod eye end from an extra top link cut it to link and weld to base of the cylinder to same length as original top link.
Then the PHD: Relocted the lower lift pins to clear the lock taps on QH, moved them forward and slightly down.
Cut the PHD tube off same length as top link fully retracted. Then notched out bottom of the tube for QH hook to slide in.
The bar stock added on top is (3) 1/4" pieces to match width of the hook. They help pull the digger up tight and reduce side movement of the gear box when under torque.
To mount it: Drop the lift pins in lower hooks, raise end of PHD boom to slide pin through the hook, the raise little more and slide smaller hitch pin in.
Getting alot of pics here so will start another reply showing the movement.
