Jcb ram seals?

1986 3cx.
I need to re seal the 4in1 rams. I am told there is a locking pin which has to be removed in order to dismantle. I can't see anything in the cap, so I assume is to do with the piston.
Can anyone tell me where it is, and how it is removed please?
Muttley, March 2016


done
the locking pin is under the piston seals

mike, July 2016
There are videos on YouTube that show how to do this - search for

Locking Pin Hydraulic Cylinder

Good Luck..., March 2016
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