Explosion -proof hand pulling gourd needs to be maintained regularly. Explosion -proof hand pulling gourd is a manual lifting tool, which is relatively simple to operate. Regular maintenance can be found in time to find damaged components, repairs and replacement in time, and avoid greater damage to the hand stretching gourd. Pay attention to the chain not only to see the damage, but also depends on whether the chain is deformed. After the chain is deformed, it does not match the sprocket, which will cause damage to the sprocket and other components. Therefore, the chain must be replaced in time after the chain is deformed.