Hi,if this is the style I think it is,here's what you do,,,take off both hoses.don't take it off machine.no need for that.put a short lenght of hose(use what fits..5/8" heater hose) on the adapter you took the hydraulic hose off,put the end of the hose in a drain container.push/ pull the rod to drain the oil out of that end,swap ends with your short piece of hose and drain the other end of the cylinder.now take the gland nut off.put the cylinder rod about midway of it's stroke.under the gland nut if the cylinder has never been repaired you'll find an orange colored plastic band.take that out.push the gland into the barrel about 2 or 3 inches.now you will see a round snap ring.with a screw driver push one end of it into the barrel.now put the end of the screwdriver in the groove in the barrel to keep the snap ring from seating back and grab the snap ring with a hook.I use a cotter pin removal tool.pull the snap rin out.remember that orange plastic band.put that in the groove you took the snap ring out of.yes it's a tool supplied by deere.it keeps the o-ring on the gland from getting stuck in the barrel groove.now make sure you support the barrel so it does'nt fall in the dirt.pull the rod like a slide hammer and take the whole thing out of the barrel.remove the piston nut and repack.make sure you clean the threads on the rod and loctite the nut so it does'nt come off!