finally getting to this project. Pto ran continuously and after receiving info from this forum, I was ready to attack this problem. I have a late model 670. It is not a super. The tractor has the plug hole on the side to access the internal workings of the pto. I was able to easily remove the plug but I can't seriously see how I'm suppose to be able do any adjustment through that hole. I can't see anything. Some of you indicated that I should remove the hydraulic assembly above and then access the pto from the top. If I'm correct, it appears that if I disconnect the lines from the pump and power steering lines that the top unit should lift off. Am I looking at this correctly? I'm thinking it would make the job much easier.