Help with Blackhawk sk-64 air jack

[CarterD2015]

I've used this particular jack years ago and it leaked some but this is excessive. It did not have the lifting power. I was able to change the main seal today and it seems improved. I spent all day messing with it and had to go before testing it under a load.

I was able to get it apart by taking the safety mechanism off and lifting the top off with a chain hoist. It was a real pain but manageable. I wasn't sure how 47 in the cartoon came apart so I left it.

Thx for the reply