Hi Jeremy...I see you are getting on well with your Hymac...she is looking good.
I see you are intending to rebuild the bucket ram...Mine was leaking pretty badly too, so in the end, I replaced the seals about 18 months ago.
It is a more difficult job than you can imagine due to the weight and size of the ram so make sure you have plenty of help and a tractor/loader or teleporter..
I did it without removing the ram from the machine.
First, I disconnected the piston end from the bucket and tried to drain as much oil as I could.
Then propped the cylinder up with wood.
After many attempts to remove the end cap, I had to borrow a 6 foot (2 metre) stilson wrench from a local engineering works, I have a photo of it.
I then got my dad to pull the piston out with the front end loader on the tractor and I caught the piston on my shoulder, as oil belched out, all over me.
I physically carried it to our Jeep (I am now recovering from a double hernia operation!!) and we took it to the engineering works and they pressed out and replaced the "eye" at the piston end, where it connects to the bucket linkages. I managed to source a brand new original eye from our local breaker, and I even had to slightly grind the lip of this bush/eye to get it to fit in the piston. The workers at the enginnering works made me do it myself, with their equipment, as they wouldn't take responsibility if something went wrong.
The seals were straightforward to put on the piston and the reassembly was the opposite of the disassembly, with me, again, supporting it on my shoulder, as my dad pushed it back in with the tractor.
It is a success, and it is a pity I didn't take more photos at the time. I just advise you to have help and a teleporter and a full day as, like any job on the Hymac, it can turn out more bother than you think.
Good luck and keep up the good work.
Alex