Where does the abnormal noise occur when the electric hoist is in operation?

During maintenance, one should listen and observe carefully. By making use of or based on the characteristics of the malfunction noises, the location of the noise can be determined, and the malfunction can be located and repaired.

● The abnormal noise occurs on the control circuit

If noise is emitted during operation, it is usually due to a fault in the electric hoist contactor (such as poor contact between the AC contactor and the contacts, mismatched voltage levels, jammed magnetic core, etc.). The faulty contactor should be repaired. If repair is impossible, it must be replaced in time. After the handling, the noise will disappear by itself.

● Abnormal noise from the motor

In this case, the machine should be stopped immediately and the cause of the abnormal noise should be checked. Check whether the motor of the chain electric hoist is operating in single phase, or if there is a bearing damage, misalignment of the coupling shaft center, etc. These issues can cause abnormal noise from the motor. The location, pitch and tone of the noise vary depending on the different faults. When the motor is operating in single phase, the entire motor emits a regular, sometimes strong and sometimes weak "buzzing" sound; when the bearing is damaged, a "clack-clack" "buzzing" sound will be heard near the bearing; when the coupling shaft center is misaligned or the motor is slightly out of balance, the entire motor emits an extremely high "buzzing" sound, accompanied by sharp and piercing noises from time to time. Based on the different noises, identify the fault and conduct item-by-item maintenance to restore the motor's normal performance. When the motor fault has not been resolved, the chain electric hoist should not be used.

● Abnormal noise is emitted from the reducer

If the reducer malfunctions (such as insufficient lubrication in the reducer or bearings, wear or damage to the gears, or damage to the bearings, etc.), the machine should be stopped for inspection. First, determine whether lubricating oil was added to the reducer's gearbox or bearings before use, and whether the lubricating oil was replaced regularly during use. Some people think that temporarily not adding lubricating oil or adding a little randomly will still allow the machine to operate without causing serious faults. However, this is not the case.