Failed Hydraulics On 3pt Lift IH B414

[Wescountry]

Not sure this is the right forum thread to post this on, so please correct me if there is another thread that is more suited for my topic.
I'm new to tractors and repairs, this is my first tractor, and I am trying to learn as I go along so any help would be greatly appreciated.

Is there anyone who is able to assist me in troubleshooting the issues with my hydraulic 3pt lift?

Tractor was running at idle with the bush hog elevated, and the bush hog deck lowered to the ground on it's own. I was unable to get it to elevate. The isolator valve is open, since then, the filters have been replaced, and fluid has been changed. The lift did go up without a load on it, but it was very slow. When I stand on the lift arms it wouldn't raise me up, and I'm about 190lbs. After that I replace the hydraulic pump and put new O rings on the isolator valve stem, and the high low flow valve stem. It's still doing the same thing. Without weight on the 3pt lift, I was able to get it to go up and down multiple times thinking this would bleed any air out of the system. And again, it won't go up if I put my weight on it. Any comment would be appreciated.

 

[JimB2]

Welcome to YT, I read your post, some tests.
1) lift the 3pt to the top with no weight on it, close the Isolator valve, shut off the tractor.
2) push down on the 3pt lift arms, do they feel spungy like there is air in the lift cylinder?
3) now put a weight on the 3pt, does it sink to the bottom?

With the Isolator valve closed and If there is no air in the lift cylinder and the 3pt sinks to the bottom with a weight on it then it usually indicates that the lift cylinder O-rings are leaking or broken.

 

[Wescountry]

Thanks JimB2 for your reply. Sorry for the late response work has been a bit demanding so i haven't been able to get back to you sooner. These all sound like great tests and i will be trying them just as you have mentioned. I won't be able to get to it for a couple of days, but as soon as I do I will keep you posted.
Thanks again