The extend retract cylinder mounted under the main boom is leaking. Looks to be coming from the seals. There is a way i think to replace the seals without removing the cylinder from the machine??? Seems like we had another one do this and that was how they did it. Any ideas?
IIRC On that machine the rod on the cylinder just goes up into the flyboom and has a nut correct? If so remove the nut with the boom horizontal and extended about a foot or so. Retract the cylinder which will bring the rod back. You will be able to remove the gland and replace the seals. The piston seal would not be able to be replace like thing without pulling the rod but if you are just having an external leak it is a quick easy fix this way. JJ
First thing I'd do is download and save the Service manual. Go here http://www.jlg.com/en-US/Maintenance.Repairs.html and click on the Parts & Service manuals link. Good step-by-step instructions for safe repairs on this stuff. I think it's important to remember that you need to relieve any pressure that the load-check valves on each cylinder may be holding before you start disassembling any part of the hydraulics. Also parts manuals available at the site. I downloaded and saved those also, to make ordering parts a bit easier.