I have a case 850k series 2 with a no can issue. The dozer has hydraulics, but won’t move in forward or reverse. The dial for the rpm gauge will not move up or down when you hit the buttons on the joy stick.
CAN ? Controller area network? Check grounds, check resistance, check for corrosion in connectors etc. and mouse chewed wires.
It was a resister on the 2 wire CAN plug that goes into the back of the dash, the resister was hidden way up in the loom, so I never seen it.