Adjust winch: Check safety brakes each transmission system is flexible and reliable Shaanxi hoist and adjust brake release gap between brake shoe and the brake wheel is not greater than 1.5mm. Check if the service brake and safety brake control electrical interlock with the main motor hoist Shandong, the main motor starts working brake is released to stop the main motor is working brake and safety brake Brake only to start the main motor. Mine shaft sinking winch manufacturing and assembly: casting defects should be loose, porosity, trachoma, cracks and other impact strength. Forging should not have cracks, sandwich, oxide layer, folding, scarring and other defects affect strength. Welded seam should not have cracks, slag, intermittent, burn and other defects. There should be no reduction in the mechanical properties of the roll and performance defects.