i have a new to me backhoe and it will not move forward or reverse engine and hoe work great
One question would be, how did you get the unit home?..... I mean, did it work when you tested it out, and when loading/unloading at new "home"..... did this problem just start? I'm new to the old 310b myself.... the simple stuff to check would be linkage ( from what I have read from fellow forum members )... from the selector on the steering column to the 'tranny' ( ?).
Also not familiar with the 310 but mine has a transmission disconnect switch. When this is pressed the wheels won't move. I use it when using the hoe and when working on the machine while engine is running