since no one has posted the proceedure yet, i'll give it to ya.
1. take out the crane from frame.
2. take a small punch to poke into the hole at the top of the crane. when you get the plunger compressed, while depressing plunger push out the pin that protrudes from the from the outside of the crane, from the inside. whatch out for flying plungers and springs.
3. after the pin is out, remove the ejector rod and front lock for the crane.
4 once the rod is removed the cyl will come off the crane, might need a little tap from the face of the cyl, use somthing soft like a leather mallet.
5. clean
6. have a beer (i think 6 is always a beer)
7. assemble in reverse (another beer is optional)