①Due to poor lubrication or failure of the lubrication system, the parts of the transmission part will be burnt and hung, causing damage to the parts of the rolling or sliding parts and being forced to stop and repair.

②Due to the lack of daily inspection and maintenance, it was not possible to timely check the wear and tear of the parts in the transmission, rolling and sliding parts of the parts, and failed to repair the parts according to the degree of wear of the parts, resulting in damage to the parts. Forced shutdown repair.

③Due to the vibration of the elevator during the operation, the fastening bolts are loose, causing the parts to be displaced, losing the original accuracy, and not being repaired in time, causing the grinding, bumping and crashing parts to be stopped.

④Because the elevator balance coefficient is too far from the standard, the overloaded elevator car is bottomed or topped. When the top is over, the speed limiter and the safety gear act to force the elevator to stop running and wait for repair.