You might want to post on justanswer.com I have gotten some good advice from that site that has kept me from going to the dealer.
It seems like an interlock interuption would keep it from tilting as well. I would wonder if it was the "hydraulic spool" for the up down function. In a bobcat brand machine, they have some orings that go bad and little filter that could get clogged up. Or it could be a broken linkage from foot pedals back to valve.