JCB hydraulics ?

Thank you again Mr Toad
It occurs to me (not yet having taught myself the workings of a JCB) that perhaps the hydraulic pump for the rams may be driven from the gearbox. If that is the case, I am wondering if the hydraulic system will be “charged” when we tow it ?
In regard to your comment, I am delighted that such an evidently knowledgeable fellow sees this as “an interesting challenge”! Especially as when I eventually get it home & start trying to restore it, I have little doubt that I may have further questions. Assuming that this is ok with you.?
Best regards.