Vermeer 605f bale density changeover kit

I have a 605f with the Teledyne changeover kit for the hydraulic bale density. The pressure gauge stopped working and my bales don't seem as tight as they were. I took the cap off the pipe above the cylinder and there is oil in there. I can't see that any hoses are leaking anywhere. Does anyone have a service manual on these kits, or could someone please walk me through how to service and/or adjust these?

 

thanks in advance

Vermeer 605f bale density changeover kit