It sounds like you may have lost the splines in the pump or on the motor. There is a quick connect test port for hydraulic pressure on a steel line near the pump. I believe its on the left hand side of the lift or on the pump. You would need a hydraulic pressure tester but it looks like a little nipple. There is a line next to the test port for steering. You could remove that line and cap it, put a hose over the fitting on the pump and into a bucket. Secure the line and try to lift half dozen times for a couple seconds, if you don't get fluid out of the line the pump is bad or the suction line, strainer or hose could be obstructed. As for tilting you will likely need to disconnect the tilt cylinders and secure the mast with another truck if you don't want to disconnect hydraulic lines.