hydraulic level on a 240 w/ loader

The fluid appears to circulate through the structural members of the loader frame. The pump is external, down in front of the grill and there is something like a lower radiator hose coming from an outlet in the lower front frame entering the back of the pump. There is a pipe plug on the top surface of a frame member on the right side back near the 2 controls. I started to unscrew that very slowly but a hiss of pressure made me change that plan before checking with "them that knows."

Some beginner's questions: (1) Is there or should there be any kind of a dipstick somewhere that will indicate low hyd fluid? (2) how would I drain/change this fluid? (3) what's the hyd fluid capacity of this system? (4) what kind of pressure is running thru this system or would any standard tractor hydraulic hose work fine?

A couple of hoses that control the bucket tip are functional but weathered down to the cords. When I tried to unbolt them, they are rusted inside and started to round off. I figure I am looking at a trip to the Terex dealer a couple miles down the road for professional assistance on those hoses. Maybe for a lot of things but $$ are scarce.

Thanks, gentlemen.