Case 1840 ran low on hydraulic fluid. When refilled, bucket moves fine. Good motion and quick response to stick inputs. However, no movement - no forward, backwards, and no turning. The engine doesn’t sound like it is trying to make the skid steer move when pushing on the sticks. I know it is in the Tandum pump under the seat. Just not sure if it cavitated and needs primed or if air needs bled out or what. I’ve read where you need to put fluid directly into the Tandum pump, it just doesn’t explain where to actually do that at. Worked fine in the AM. Stopped for lunch. After lunch fueled up, topped off the hydraulic oil and that is when the issue started. Disengaged the valves to free wheel, drug it up on my trailer and brought it back to the shop. Here it sits.