1. When disassembling the pin coupling, mark the position between the pulley or pin coupling and the rotating shaft first, unscrew the factory fixing screws and pins, and then slowly pull it out with a puller.If you can't pull it out, you can pour some kerosene into the inner hole and pull it out.If you still can’t pull it out, you can quickly heat it around the pulley or coupling with a flash of fire. At the same time, wrap the shaft with a damp cloth and continuously pour cold water to prevent heat from entering the motor.

　　2. When assembling the pin coupling, first use a fine iron emery cloth to smooth the shaft hole of the shaft, pulley or coupling, align the pulley or coupling with the keyway and set it on the shaft, and use wrought iron or hardwood block to pad At one end of the key, gently tap the key into the groove.The key should be properly tight in the groove. Too tight or too loose will damage the key and groove, and too loose will cause the belt to slip or vibrate.

　　When assembling the pin coupling, first use a fine iron emery cloth to smooth the shaft hole of the shaft, belt pulley or coupling, align the pulley or coupling with the keyway and set it on the shaft, and pad it with wrought iron or hardwood. At one end of the key, gently tap the key into the groove.The key should be properly tight in the groove. Too tight or too loose will damage the key and groove, and too loose will cause the belt to slip or vibrate.

　　When disassembling the pin coupling, mark the position between the pulley or coupling and the rotating shaft first, unscrew the factory fixing screws and pins, and then slowly pull it out with a puller.If you can't pull it out, you can pour some kerosene into the inner hole and pull it out.If you still can’t pull it out, you can quickly heat it around the pulley or coupling with a flash of fire. At the same time, wrap the shaft with a damp cloth and continuously pour cold water to prevent heat from entering the motor.