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Created on 08.17
Common Electric Hoist Problems and How to Solve Them
Common Electric Hoist Problems and How to Solve Them
Introduction
Electric hoists are widely used in workshops, warehouses, factories, production lines, overhead cranes, gantry cranes, and material handling systems.
During long-term operation, electric hoists may experience different problems related to lifting performance, braking, wire rope winding, chain movement, motor temperature, electrical control, and mechanical wear.
If these problems are not detected and solved in time, they may reduce lifting efficiency, increase maintenance cost, and create safety risks.
This article introduces common electric hoist problems, possible causes, and practical maintenance suggestions.
Why Electric Hoist Maintenance Is Important
An electric hoist is a compact lifting system that usually includes a motor, reducer, brake, lifting medium, hook, control system, and safety devices.
Depending on the hoist type, the lifting medium may be a wire rope or a load chain.
Regular maintenance is important because electric hoists often work under repeated lifting cycles, load changes, vibration, and different working environments.
Good maintenance can help:
- improve lifting safety
- reduce unexpected downtime
- extend service life
- protect key components
- reduce operating cost
- improve working efficiency
1. Electric Hoist Cannot Lift the Load
One common problem is that the hoist cannot lift the load or lifts very slowly.
Possible causes include:
- overload
- low voltage
- motor failure
- brake not releasing properly
- damaged contactor
- worn gear or reducer problem
- incorrect power supply
The first step is to check whether the load exceeds the rated capacity of the hoist.
If the load is within the rated capacity, the power supply, motor, brake, and electrical control system should be checked.
The hoist should not continue operation until the problem is confirmed and repaired.
2. Brake Slipping or Brake Failure
The brake is one of the most important safety components of an electric hoist.
If the brake slips or fails, the load may move downward after stopping, creating a serious safety risk.
Possible causes include:
- worn brake friction plate
- incorrect brake clearance
- weak brake spring
- oil or dust on the brake surface
- brake coil failure
- overheating caused by frequent operation
Brake performance should be inspected regularly.
If brake slipping is found, the hoist must be stopped immediately and repaired before further use.
3. Wire Rope Winding Problems
Wire rope winding problems usually occur in wire rope electric hoists.
Common problems include:
- rope crossing
- rope jumping
- uneven winding
- rope guide damage
- wire rope crushing
- broken wires
Possible causes include incorrect rope guide adjustment, worn rope guide, overload, improper operation, or damaged drum grooves.
Wire rope winding problems can quickly damage the wire rope and drum.
Operators should stop the hoist if abnormal rope winding is found and inspect the wire rope, drum groove, and rope guide.
4. Wire Rope Wear and Broken Wires
Wire rope wear is a common problem in wire rope electric hoists.
Long-term use, poor winding, sharp drum grooves, overload, corrosion, and lack of inspection may cause wire rope damage.
Common signs include:
- broken wires
- flattened rope
- corrosion
- diameter reduction
- kinking
- abnormal rope surface wear
A damaged wire rope should be replaced according to safety requirements.
Wire ropes should be inspected regularly to prevent sudden failure during lifting.
5. Chain Wear or Chain Jamming
Chain wear and chain jamming are common problems in electric chain hoists.
Possible causes include:
- lack of lubrication
- chain elongation
- chain deformation
- worn chain wheel
- foreign objects in the chain path
- improper chain storage
- overload
If the chain does not move smoothly, the hoist should be stopped and inspected.
The load chain, chain wheel, chain guide, and chain bag should be checked carefully.
A worn or deformed chain should not continue to be used.
6. Motor Overheating
Motor overheating may occur when the electric hoist works beyond its designed duty cycle.
Possible causes include:
- overload
- frequent starting and stopping
- low or unstable voltage
- poor ventilation
- damaged motor bearing
- brake dragging
- long continuous operation
If the motor becomes too hot, the hoist should be stopped and allowed to cool.
The working duty, load condition, power supply, and brake status should be checked.
Choosing the correct hoist duty class is important for preventing overheating.
7. Abnormal Noise During Operation
Abnormal noise may indicate mechanical wear or internal damage.
Possible causes include:
- worn gears
- insufficient lubrication
- damaged bearings
- reducer problem
- loose bolts
- chain wheel wear
- drum or rope guide problem
Noise should not be ignored.
If the hoist produces abnormal sound during lifting or travelling, the equipment should be inspected before continued operation.
8. Limit Switch Failure
Limit switches are used to prevent over-lifting or over-lowering.
If the limit switch fails, the hook may move beyond the safe position, causing damage to the wire rope, chain, drum, hook block, or hoist body.
Possible causes include:
- incorrect adjustment
- damaged switch
- loose wiring
- mechanical wear
- dust or moisture entering the switch
Limit switches should be tested regularly.
Operators should not use the limit switch as a normal stopping method during daily operation.
9. Hook Problems
The hook is a key load-bearing component of the electric hoist.
Common hook problems include:
- hook opening deformation
- hook wear
- cracks
- damaged safety latch
- hook rotation problems
- corrosion
The hook should be inspected before operation.
If cracks, serious deformation, or excessive wear are found, the hook should be replaced.
A damaged safety latch should also be repaired or replaced before lifting.
10. Electrical Control Problems
Electric hoists rely on electrical control systems for safe operation.
Common electrical problems include:
- control button failure
- contactor damage
- wiring looseness
- phase loss
- overload protection failure
- remote control signal problem
Electrical problems should be handled by qualified personnel.
Before maintenance, the power supply must be disconnected to ensure safety.
Daily Inspection Checklist
Before using an electric hoist, operators should check:
- hook condition
- safety latch
- wire rope or load chain condition
- brake performance
- limit switch function
- control buttons
- abnormal noise
- lubrication condition
- power supply
- visible damage or looseness
Regular inspection helps detect problems before serious failure occurs.
Maintenance Recommendations
To extend electric hoist service life, the following practices are recommended:
- avoid overload
- follow the rated working duty
- inspect wire rope or chain regularly
- keep proper lubrication
- check brake condition
- test limit switches
- keep the hoist clean
- inspect electrical components
- replace worn parts in time
- keep maintenance records
Correct maintenance can improve safety and reduce unexpected downtime.
When Should Electric Hoist Parts Be Replaced?
Some components should be replaced when wear or damage exceeds safe limits.
Common replacement parts include:
- wire rope
- load chain
- hook
- safety latch
- brake friction plate
- rope guide
- bearings
- contactors
- limit switches
Replacement should follow manufacturer instructions and site safety requirements.
Common Mistakes in Electric Hoist Use
Some common mistakes include:
- lifting loads beyond rated capacity
- using the limit switch as a regular stop
- ignoring brake slipping
- continuing to use damaged wire rope or chain
- operating too frequently beyond duty class
- ignoring abnormal noise
- poor lubrication
- not keeping inspection records
Avoiding these mistakes can greatly improve hoist safety and reliability.
Conclusion
Electric hoists are important lifting devices, but they require proper inspection and maintenance during long-term use.
Common problems include lifting failure, brake slipping, wire rope winding issues, chain wear, motor overheating, abnormal noise, limit switch failure, hook damage, and electrical control problems.
By performing regular inspection, using the hoist correctly, and replacing worn parts in time, users can improve lifting safety, reduce downtime, and extend equipment service life.
For industrial lifting applications, the correct hoist type, proper maintenance, and reliable spare parts are all important for safe and efficient operation.
Contact
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WEILINK CRANE is a professional manufacturer of crane components and lifting equipment, located in Changyuan City, Henan Province, China — the well-known lifting machinery manufacturing base.
With 20 years of industry experience, we specialize in crane hooks, crane wheels, pulleys, electric hoists, lifting tools, grab buckets, and jib cranes.
We provide high-quality products and customized solutions for overhead cranes, gantry cranes, steel plants, ports, shipyards, and heavy industries worldwide.
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