PLEASE SOMEONE HELP! L783 boom cylinder seals

[FL-HVAC]

I have what i believe to be a 1994' ish L783 with some leaky boom cylinders have not had any luck finding someone who can break the cylinders down for new seals. Im ready to give it a go myself. If john deere service center cant figure it out then i guess I'll have to. My question is this, how do you get the piston out of its sleeve and is there any advice someone can give me for this problem. I have a diagram of the cylinder and i am mechanically inclined with just about any tool i need at my disposal. Any help will be greatly appreciated. Thank you!

 

[Mike10]

It appears the L783 uses a spanner nut on the end of the cylinder. Remove the nut, then tap the head, where the nut was screwed on, into the barrel of the cylinder enough to access the internal snapring. Remove this ring and pull the cylinder rod and head out of the barrel.

 

[FL-HVAC]

It appears the L783 uses a spanner nut on the end of the cylinder. Remove the nut, then tap the head, where the nut was screwed on, into the barrel of the cylinder enough to access the internal snapring. Remove this ring and pull the cylinder rod and head out of the barrel.

Thanks for the reply. I can't figure out how the assembly slides out of the barrel. There is a black metal ring on top where the cylinder rod comes in and out of the barrel, it has two holes on opposite sides of one another, before I brought it to John deer, I tried to spin the ring with large pair of channel locks. The ring was free spinning but somewhat tight but did not seem to be loosening or coming out at all. There is no exposed nuts on the outside of the barrel, but I do see the nut in the diagram I have. Do I spin the whole cylinder rod itself?

 

[FL-HVAC]

Thanks for the reply. I can't figure out how the assembly slides out of the barrel. There is a black metal ring on top where the cylinder rod comes in and out of the barrel, it has two holes on opposite sides of one another, before I brought it to John deer, I tried to spin the ring with large pair of channel locks. The ring was free spinning but somewhat tight but did not seem to be loosening or coming out at all. There is no exposed nuts on the outside of the barrel, but I do see the nut in the diagram I have. Do I spin the whole cylinder rod itself?

Or a pipe through the top end, barrel in the vise and beat it out? you're obviously dealing with no expert here my friends! I haven't tried much just out of fear for f*cking it up, that's why I am here asking. I really appreciate the help!

 

[Mike10]

Or a pipe through the top end, barrel in the vise and beat it out? you're obviously dealing with no expert here my friends! I haven't tried much just out of fear for f*cking it up, that's why I am here asking. I really appreciate the help!

What happens sometimes when you try and remove the spanner nut is the head itself rotates with the nut. The nut looks like a ring with two slots. If you can not get the nut to rotate separately then you have two options. One is to split the nut and the second is to install a hose on the lift side of the cylinder and extend the cylinder completely. this forces the piston against the head and applies enough pressure against the head so it won't rotate with the nut.
Once the nut is removed you will need to tap the head back into the cylinder to get access to the snap ring. The ring does not have any ears and is just a ring in a groove of the top end of the cylinder barrel. Once the ring is out the rod should come out of the barrel.

 

[FL-HVAC]

What happens sometimes when you try and remove the spanner nut is the head itself rotates with the nut. The nut looks like a ring with two slots. If you can not get the nut to rotate separately then you have two options. One is to split the nut and the second is to install a hose on the lift side of the cylinder and extend the cylinder completely. this forces the piston against the head and applies enough pressure against the head so it won't rotate with the nut.
Once the nut is removed you will need to tap the head back into the cylinder to get access to the snap ring. The ring does not have any ears and is just a ring in a groove of the top end of the cylinder barrel. Once the ring is out the rod should come out of the barrel.

Awesome, this is going to be a great help! I think i understand completely how it works now. Thank you very very much. I'll let you know how it went.