1. Precautions: The chain of the hand-operated pulley should be lubricated regularly to avoid jamming; slanting hoisting or overloading is prohibited. When operating the pulley, pay attention to resetting the handle to prevent wear on the mechanism; avoid long-term exposure to humid environments. Check before operation 2. Load matching: Ensure that the rated load of the pulley is ≥ the actual lifting weight, and overload is strictly forbidden (overload is the main cause of breakage). If the load approaches the upper limit, reserve a 20% safety margin (for example, a 10-ton pulley can lift up to 8 tons at most).