SD-455 has good advice. When you move the snap ring forward, it goes into a deeper groove and lets the ram come out. When putting it back together, just move the ring back into the rear groove. When you look at the parts book for an l-2 its confusing. Here's a tip, when you have the head blocked up to remove the cylinder, after the hose is disconnected, turn the 90 degree fitting down into a 5 gallon bucket, unpin the front end of the ram and collapse it. I did that on the 2nd one and it worked a lot better. 'Course I was already soaked from the 1st one. I look at it as a learning experience. I don't know what thread size the hose is, but if you have a male plug it will help to prevent more oil leaking out while you are doing the rebuild. The rebuild kit from AGCO was around $26.00 each for the 3 inch cylinders. Also check the rams for any nicks or rough places and touch up with emery cloth. After I replaced the seal kits on the l-2, it would hold the 630 corn head up over night and I could raise up the ram lock and hook it without having to start it up and raise it off the safety. Good luck.