Here's the definitive list of all the seals that have ever been used by JCB on the 520-40 Telehandler. If you are repairing hydraulic seals on your JCB 520-40 Telehandler, we have them here.
Just pick from the seals above, and you can checkout online. We have the seals in stock, and will send them out straight away.
Just don't forget that if there are two rams in an application, like the stabilizer rams, you'll need 2 seal kits.