i had a 50a backhoe for several years. i was always leary of it as parts can prove difficult to source for an older british machine.
i do know you can go on AGCO's website and view the entire parts manual for the machine, get part numbers and then internet search the number.
i had luck getting seals and stuff like that from baum hydraulics online
mine got to the point that it would not steer if i did not pick the front axle up off the ground