I can't help you with your question, but I went around in circles with a 310SJ TMC several years ago and they are way over engineered and extremely expensive to fix. This one hit an underground power wire and fried who knows what all. Both joysticks showed bad and that was just the beginning, at that time they were around $7500.00 each. If I remember correctly, you could buy just the circuit board back then. The owner was from north of the border in B.C. and didn't really understand things, it WAS a very nice machine until then but it would have been cheaper to part it out and buy a normal backhoe.