Common crane failures and their causes
Do you know which machine performs a tough job at any construction site? That is a crane! It lifts steel beams for a high-rise building. It places precast concrete panels. The best part? The crane handles loads that are difficult for humans or small machines. But the consequences can be serious when a crane failure happens. This is why you should be careful with common crane failure warnings. Read on this blog post to find out the most common crane failures and their causes.
Quick Answer
The most common crane failures are the following:
- Wire rope failure
- Hydraulic system leaks
- Boom damage
- Hook failure
- Structural cracks
- Engine or electrical problems
- Overloading failures
You can prevent most crane failures through routine maintenance and proper training. Most importantly, it is advisable to follow the operating limit guidelines of the manufacturer for the best performance of cranes.
Why Do Crane Failures Happen?
A crane lifts heavy loads safely. However, it is only possible when every component of the crane is working properly. The experts suggest that many crane failures happen because builders skip or ignore the warning signs.
Let’s understand it this way: The crane works properly even if there is a slightly frayed wire rope today. But that tiny defect will grow until the rope snaps under load. Similarly, a small oil leak is harmless in the morning. Lower hydraulic pressure can affect boom movement and lift capacity by the afternoon.
Given below are the common causes of crane failures at construction sites:
- Lack of maintenance
- Poor lubrication
- Excessive weather exposure that cause corrosion
- Improper rigging
- Inadequate training of operator
- Operating above specific load capacity
Note: The major crane failure happens when multiple small problems combine into one major failure.
What Are the Common Crane Failures at Construction Site?
The table below highlights the common crane failures and their impacts.
| Crane Failure | Common Cause | Possible Impact |
| Wire rope failure | It usually happens due to corrosion and overload. | The crane’s capacity to hold a load becomes less due to wire rope failure. |
| Hydraulic failure | This failure is common due to oil leaks and damaged seals. | The crane reduces its lifting power. |
| Boom damage | Overloading or fatigue leads to the damage of the boom. | The structure of the crane collapses due to boom damage. |
| Hook failure | Hook failure in the crane often happens due to cracks or deformation. | The crane releases the load due to hook failure. |
| Structural cracks | A common reason for structural cracks in the crane is poor inspection. | The crane might be damaged if the contractor does not pay attention to structural cracks. |
| Engine failure | It is necessary to service the crane regularly. The engine may fail without proper maintenance. | Engine failure can compromise your day-to-day operational activities. |
| Electrical failure | Faults in wires or excessive moisture can result in electrical failure of the crane. | Electrical failure may lead to operational shutdown of the crane. |
| Overloading | It is crucial to follow the load limit guidelines by the manufacturer. | Overloading can cause damage to multiple components of the crane. |
Given below are the common failures of cranes:
- Wire Rope Failures
The wire rope in the crane lifts the heavy loads. Hence, it bends or corrodes over time. The engineers receive the following warning signs:
- Broken strands
- Rust
- Flattened sections
- Kinks
It is advisable to be mindful of these signs. These signs could lead to complete rope failure during lifting if not paid attention to on time.
- Hydraulic System Failure
Hydraulic cylinders are responsible for the movement of cranes. Hence, the lifting efficiency reduces if you notice the following signs in the hydraulic system:
- Leaks
- Contaminated hydraulic oil
- Clogged filters
- Damaged seal
The builders may notice sudden boom movements if the hydraulic system fails to perform at the construction site. This is why it is necessary to replace oil regularly and inspect for leaks for early prevention.
- Boom Failure
The boom carries heavy loads. Hence, it can bend or crack due to continuous overloading. What’s more? It may also fail to perform if the builders use it on unstable ground. It is advisable to repair it as soon as you see a crack in the boom of the crane.
- Hook Failure
The hook of the crane is known to carry the entire suspension load. The contractors often see the following hook failures in the crane:
- Hook deformation
- Cracks
- Excessive wear
- Missing safety latch
It is ideal to replace work hooks before failure, as it helps you avoid future expenses.
- Structural Cracks
Every lift creates stress on the frame of the crane. Microscopic cracks develop in welds and structural members after thousands of lifting cycles. The contractors prefer routine non-destructive testing (NDT) to detect and prevent these hidden problems.
- Engine and Electrical Failures
Modern cranes depend on electronics. Hence, engine issues like battery problems or faulty sensors can influence smooth operations. This is why it is necessary to prevent it from moisture for seamless experiences.
- Overloading
It is one of the greatest causes of crane failure globally. The stress on the crane increases when the workers exceed its rated capacity. Thus, the experts recommend carefully reading the load charts before use. This ensures the safety of both the crane and workers on-site.
What Are the Tips to Maintain the Crane at a Construction Site?
Good maintenance of the crane helps you save on future emergency repairs. This is why most manufacturers recommend following the best practices. Given below are some of the tips to follow:
- Inspect the crane daily before using it at a construction site.
- Perform hydraulic oil testing to ensure that there are no oil leaks.
- Lubricate the wire rope properly to prevent wear and tear.
- The crane must have torque on structural bolts.
- Modern cranes work on electronics. Thus, inspect the electrical appliances before use.
- Read the manufactures guide book before using the crane at a construction site.
Tip: It is advisable to buy a digital maintenance log. This is because they help you track the maintenance history and identify recurring problems.
The Final Words
The crane operator knows that major crane failures happen after regular warnings. They begin with small issues. But it might become a serious problem if the contractor fails to prevent it on time. Cranes help the workers do the heavy lifting. Thus, it is necessary to maintain and repair the cranes regularly.
FAQs
1. What is the most common crane failure?
Answer: Wire rope failure is one of the most common crane failures. Continuous bending, friction, corrosion, overloading, and poor lubrication gradually weaken the rope. Regular crane inspections and timely wire rope replacement help prevent accidents and ensure safe lifting operations.
2. What causes crane boom failure?
Answer: Crane boom failure is commonly caused by overloading, metal fatigue, improper crane setup, unstable ground conditions, or poor maintenance. Following the manufacturer’s load chart, inspecting the boom regularly, and operating on firm, level ground significantly reduce the risk of failure.
3. How often should cranes be inspected?
Answer: Cranes should undergo daily pre-operation visual inspections and scheduled periodic inspections based on the manufacturer’s guidelines, usage frequency, and local safety regulations. Regular crane inspections help identify wear, damage, and potential safety hazards before they lead to equipment failure.
4. Can hydraulic leaks cause crane failure?
Answer: Yes. Hydraulic leaks reduce system pressure, affecting the crane’s lifting capacity, stability, and overall performance. Ignoring hydraulic leaks can lead to equipment failure, safety risks, and costly repairs. Regular hydraulic system maintenance helps ensure reliable crane operation.
5. Why is overloading dangerous?
Overloading places excessive stress on crane components, including the boom, wire ropes, hooks, and hydraulic system. It can cause structural failure, tip-overs, or dropped loads. Always follow the crane’s rated load capacity and load charts for safe operation.
6. How can crane failures be prevented?
Answer: Most crane failures can be prevented through routine maintenance, regular inspections, proper operator training, timely replacement of worn parts, and strict adherence to load limits. A preventive maintenance program improves crane safety, reliability, and operational efficiency.
7. What are early warning signs of crane failure?
Answer: Early warning signs include unusual noises, hydraulic oil leaks, damaged wire ropes, visible cracks, slow hydraulic response, excessive vibrations, and warning alarms. Addressing these issues immediately helps prevent major crane failures and improves workplace safety.
