I have a 2007 310SJ 5400 hours that is having transmission problems. First and second gear forward trips into neutral after 5 seconds and shows FWD or Y3 solenoid device fault. 3rd gear forward runs fine. First and second gear run fine in reverse. 3rd gear reverse trips and shows Reverse or Y6 solenoid device fault. I have replace the FWD solenoid and found no changes.
Welcome To HEF. There are several versions of that backhoe. The experts here will need your complete serial number to figure out which one you have.