The cab and tire cylinders have safety checks in them. air trapped in the cylinder can cause them to lockup. Basically the air stuck in the cylinder compresses and stores energy, and when you switch the valve, it releases the pressure. The compressed air forces the fluid fast enough to lockup the check valve, holding it there and freezing any further movement.
You can remove the hose on the cylinder and the elbow fitting, then remove the clip and screen and push a small allen wrench or rod in thru the hollow setscrew and spring to push the check ball back off the seat and release any stored pressure. Depending on how much pressure is stored, you may need to tap on the rod you insert in to touch the ball. When the pressure/fluid is released you should be able to feel the spring on the other side of the ball when you push in on the rod. The spring on either side hold the ball centered between 2 seats so fluid can flow either way past the ball untill it trys to flow too fast and forces the ball against a seat, locking up the cylinder. They are supposed to leak a little to release by themselves, but the air pocket trapped in the cylinder means it has to leak a lot of fluid to release enough pressure to unlock…
Once you release the pressure, put the parts and hose back in place and lower the spare, then remove the rod end pin from the tire crane so you can stand the cylinder with the rod pointing up. This will let the air rise to the outlet pipe so it can escape ahead of the fluid when you cycle it, then cycle the cylinder fully in and out a few times to make sure you get all the air out of the rod end of the cylinder. Then without removing any hoses, lay the cylinder back down and reconnect the rod end to the crane and lift the tire back in place…
Aren't hydraulics fun
here is a video I did showing how it is put together, luckily the one with the safety is the easy hose to get to…