john deere 6603

Had to remove a line from the a/c system on my 6603. I am replacing the dryer before reassembling the system. Can someone tell me how much pag oil I need to add back to assure proper lubrication of the compressor? Thanks

Can anyone tell me what position the front end loader should be in to check the hydraulic fluid? Thanks for any help.

I'm considering the purchase of a 2007 JD 6603. I have no experience with this tractor. Has anyone used one? What's the good, bab, and ugly?