Check its manual before using the manual hoist, to understand its technical performance, and should be used to pay attention to the following question: (1) The operating manual hoist must be detailed examination of the various components and parts, including chain link, in good condition before use. (2) shall not be overloaded. (3) lifting chain vertical hoisting heavy objects. Chain, each chain link are not permitted to have the wrong button. Guangzhou gongyou lift slings machinery co.,ltd is a collective enterprise specializing in research, production and sales of lifting machine. It is a modern enterprise in manufacturing of chainblock ,electric hoist , lifting slings ,steel wire rope , rigging hardware and so on .