The reason why the Aolong cab cannot be raised or lowered is that the lift cylinder is broken. If the Aolong vehicle cab cannot be raised or lowered, the manual lifting system requires you to adjust the lifter to an upward gear, then pull up the clamp, find a stick, put it in a sleeve next to the clamp, and press it step by step. Every time you hear a ding during the pressing process, it means that the clamp is stuck. For safety reasons, you must stop when you hear a ding.