① Overloading is strictly prohibited; the weight should be estimated before lifting. ② Lifting at an angle is forbidden – the steel wire rope must bear the load vertically to prevent the trolley from tipping over or derailing. ③ No one is allowed to stand under the heavy load during operation, and it is absolutely not permissible to pass over someone’s head or precision equipment. ④ The track stoppers should be checked regularly to prevent the trolley from moving beyond its limits.