This is helpful. I have a backhoe on my tractor, but I don't think the return line from the 3rd function connects directly to the backhoe, if at all. I have a rear remote that activated by pushing the cab lever all the way forward to power the hoe when it's attached.
I'll have to trace things out. The FEL works, but it has some weird behavior, like a huge air bubble is trapped in the system somewhere. I've run it through various full travel exercises, but it still is a bit "rubbery" when trying to use it.
I'm interested in chasing the 3rd function routing to make sure it's correctly installed. I bought the tractor with about 300 hours on it and everything seemed to work fine when checking it out, but it's not until you give it some real work do the issues appear. not a biggie, but definitely not the same as my 2655. That FEL was solid.