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https://ebay.io/m/XiRBCU

I suspect a check valve somewhere isn't working and the pump is seeing cylinder pressure. When i get a chance I'll pull it apart again.

Yea. I replaced it when rebuilding.

Here are pictures of the diagram that came with the rebuilding kit. Every single piece that i removed i replaced with new from the kit. A,B, and C all pertain to the pump block holes.

No groove.the seal is just an oil seal / wiper. It presses in and sits flush just like the original. Under the seal is a plastic split-washer and an o-ring. No pressure should be going against these parts unless something else is wrong. But i have no clue what it could be.

New seals everywhere. Put in correctly and no folds. What groove cleaning are you referring to? I cleaned the whole jack. The only thing i didn't mess with was the overload adjustment. That's factory set.

I joined up here with hopes you guys can help me figure out why this jack isn't working. It's a Matco AM200F 2-ton. When i got it i knew it needed rebuilding. So i ordered a rebuilding kit for it and got it all looking nice and new. However it's not working correctly. It lifts and lowers fine...