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I’m looking at purchasing a 710M that is in very good shape but has been sitting idle for several years. Everything works great except the diff lock levers will not move. I assume the system needs to be flushed (after reading through several other posts).

My question is: what is the process for flushing and bleeding the system? The repair manual I looked at didn’t have much detail and I have no experience with these vehicles.
Thanks for the help!

If your levers don't move, I hope you got a great deal on your 710M! First thing would be a rebuild kit for your master cylinders. Get rid of the 30 yr old fluid sludge build-up in the master cylinders, then flush the lockers just like you do the brakes. It's not hard... with two people it's much easier!
They should go right on and off with the lever. OK, it takes a bit more time for them to disengage, that's normal. Good luck!

Could be sluge. first i would suck out the resavore get a one man bleader pretty cheap makes the job easy start at the front work your way back. this has been brought up in the past on the top of the forum is a search botton i would use. some of the older cranky guys aren't repling to post that have been brought up in the past ( I'm just kidding by the way) well back to my crown and coke

First, do not force the levers You will have to determin if the problem is in the master cylinders, plugged flex lines(very common), or the slaves.
Crack a line loose at the master and see if the lever moves, if it does, then look at the flex lines next