Got my JD 4520 from the factory with the 3rd rear SCV, it has a float position on it.
For $230, added a top link with check valves (CCM), ran it on the 3rd SCV. TnT sounded like a good idea, jenkinsph (aka Steve) was seriously in favor of them so I wanted the TnT on the joystick. Got the sidelink with check valve for $310 (CCM). While the tractor was getting a few repairs done, I paid dealer about $500 to re-route the hydraulic lines to the rear, used the QCs from the front and put them on the back (don't have a loader on the 4520). So for a little over $1K got TnT on the joystick, see enclosed pix.
No good way to route the sidelink to the QCs, have the hoses cleaned up a bit from when I took that pix. If I ever want to add a loader, I'm out the $500 to move the lines (still have the steel lines that came with the tractor). It would cost about $1800 to have the dealer install the diverter, so adding a loader with skid steer quick hitch and grappler and diverter is probably a $10K event, which I would only do if my
B21 TLB died.
When I get on to some grading projects, I'll see if the check valves on the toplink are a problem. The joystick has a float position, but with the check valves of course it doesn't do anything for me. Just have to play with it and see, should only be an issue with the land plane. Worst case, buy a non check valve top link. It will take some seat time to figure out if I want to add some sort of restricting orifice to all this. Top link is OK, side link is very touchy. But it's pretty amazing what you can learn to do, so again more seat time needed. Side link sensitivity might also be not enough load on it, so it may behave very differently when there's a box blade or land plane on there. I really got to get out and do some grading...
The usual "if I'd known them what I know now", but that's how it goes. Anyone buying a 4x20 and who plans to use it for landscaping type ground work, should get the diverter, factory TnT, and iMatch. Got lots of good help from Steve and others on the path to the TnT. BTW, also have a iMatch on the 3PH now :thumbsup:
I think that's all the stuff you were asking about...
Pete