Hello, you do NOT have to disconnect any hoses to bleed air. system will self-bleed.
Remove oil tank cap and check level., should be about 1-1/2" from top when full.
there is a procedure for adding hydraulic oil. basically, start machine run ram all the way out, stop engine check oil level.
then start again and run ram all the way in, stop engine, check level.
Then rub ram in and out several times, stop engine and check oil.
I have to find copy of manual and will copy instructions for you. I use AW32 Hydraulic oil.
Give me a little time. someone on here has uploaded the Didier Manual, very helpful
Good Luck