hi blueray,
welcome to the forum,
the hydraulic implement locking device can be used on the Q-release fittings that are already on the loader (3rd service)
you can add, as an optional extra, the 4th service that comes with a second solenoid and valve that's screwed into the opposite side of the valve that's already on the loader,
it also comes with two Q'release fittings and all pipes and hardware,
its easy to fit.
the harsh-man plug is already on the loader ready for it.
the second button on the joystick is used for this when its fitted,
a hyd imp locking kit will cost you approx €660+v retrofit.
but you will have to pay xtra for the 4th service (which isn't cheap either) if you want it separate from the 3rd service.
the hyd imp lock is well worth it if your changing from say bucket to fork to spike and so on,
however if your using a shear, you will still have to get out to couple/uncouple the hyd pipes neway.
you can also invest in a selectofix for the loader and for the implement, which is handy as the hyd pipes can be coupled under pressure.
the down side of the selectofix is that it has then to be fitted to all attachments that you use. so they can all couple to the loader as it wont accept ordinary Q-release fittings after its fitted to the loader side.
what im trying to say is, that if your mostly using implements that dont require hydraulics, the hyd imp lock is as handy as sliced bread,
but if you only have a bucket and a shear its a bit of an over kill as you will still need to manually connect the pipes on the shear, therefore defeating the cause somewhat.
dose that make sense to you.
ps,
did your dealer wire up the softdrive on the loader, as all the Quicke's come with it as standard now.
i ask this as ive seen a few lately fitted to tractors and the dealer didnt bother to wire it up as its a bit trickier than the 700&900 series wiring.