me no have JD 400 series parts
but, im curious. why does it need replace? its very rare that they go bad and cant be resealed to fix a leak.
They can be rebuilt as mine is leaking. I knew of the leak when I bought it as he knocked off $250 because of it. Unfortunately, the closest place to cut open, rebuild and reweld the cylinder is over an hour away. New cylinder is $360, smh.
Thanks for replying quickly.