Electric Hoist Troubleshooting: 6 Common Faults and Solutions

Electric Hoist Troubleshooting: 6 Common Faults and Solutions
As essential lifting equipment in industrial production, electric hoists play a vital role in ensuring production efficiency and safety. Their stable operation is essential for maintaining workflow efficiency and preventing workplace accidents. However, during daily use, various problems may arise, affecting their performance and even endangering the safety of operators. This article summarizes common electric hoist faults and their corresponding solutions to help users quickly diagnose and resolve problems, ensuring safe and efficient operation.
1. Abnormal Noise During Operation: Abnormal noise from an electric hoist often signals the beginning of a mechanical failure. For example, problems with the motor or gearbox can also cause unusual sounds. Regularly monitoring operating noise can help detect problems early. Motor Noise: If the noise originates from the motor, stop the hoist immediately. Check for bearing damage, rotor scraping, single-phase operation, or misalignment. Like human illness, mechanical failures often manifest externally. Check whether the lubricant is changed regularly. If not, change the engine oil first. Inspect the gears for damage or bearing deformation, and replace components as needed.
2. The hoist does not respond when the switch is pressed. This is one of the most common problems and has three main causes: 1. Power not connected:
Always make sure the power is connected-this is the most common oversight.
2. Switch circuit problem:
Overheating from prolonged use or mechanical shock can damage internal wiring or cause loose connections. Check for burned or disconnected wiring.
3. Low voltage power supply to the motor:
If the motor supply voltage is more than 10% below the rated voltage, the hoist will not lift the load. Use a voltmeter to measure the voltage and ensure it is within the acceptable range before restarting.
4. The hoist does not stop after it has stopped. If the hoist continues to operate (raising or lowering to its limit) after the stop button is pressed, this is usually caused by welded contactors. The stop contacts cannot open, and the motor continues to operate. In this case, immediately disconnect the main power supply and inspect or replace the contactor.
5. The hoist slips after stopping. Over time, the electric hoist may slip due to problems with the brake system:
Adjust the brake nut according to the instructions in the hoist manual. If necessary, replace worn brake pads or springs. Dust and oil can also affect braking, especially oil, which can cause excessive slip. In some cases, if the motor coupling is stuck or improperly moved, the brake disc may not properly contact the end cover, resulting in unstable braking. Inspect and repair or replace the coupling accordingly.
5. Gearbox Oil Leakage: Gearbox oil leakage is usually caused by:
Worn or damaged seals between the housing and cover - replace the seals.
Loose bolts on the gearbox - tighten the bolts after the crane stops.
6. Motor Faults: Long-term continuous operation can cause the motor to overheat due to overload or poor lubrication. Other problems include contactor failure, fuse failure, or wiring errors. Common Motor Faults and Solutions: Overheating: Usually caused by overloading. Keep the crane within its rated capacity.
In Summary: Safe and efficient operation of electric hoists depends on proper use and regular maintenance. Promptly identifying and resolving problems can extend the life of the equipment, maintain smooth production, and ensure workplace safety. For complex or unresolvable problems, it is strongly recommended to consult a professional technician for inspection and repair. A well-maintained electric hoist not only ensures safe operation but also plays a key role in improving overall productivity.