my 821 b case loader had some issues, it would start up and not move, couple hours later it would start up and work fine, some times it would kick out or hesitate when digging , now it only has 1st and 2nd gear , I can get it to shift into 3rd if I select neutral then 3rd and then forward, but after shifting into 3rd , it will immediately down shift into 2nd , haven`t checked pressure or electric but was looking for some input,
Have you checked your brake and accumulator pressures? Also check your speed sensor in the side of the transmission housing.