Hello buddy!
I just got done rebuilding my cylinder.
It was around 25 in parts and 100 in pain in the butt labor getting it off.
I replaced the old weak seals with industrial grade seals. I also upgraded to a good hydraulic fluid. It raises and lowers with great! I even left it mid lift for a week.
This is a SINGLE stage cylinder, rebuilding it is pretty easy if you are HANDY.
1978 Hi-lo 25ft
If you want help! Let me know
I have a parts list! I also purchased an extra set!
I should I made a guide on how to do it.