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What Is the Lifting Moment of a Crane?

Views: 0     Author: Site Editor     Publish Time: 2024-03-15      Origin: Site

Construction efficiency involves use of machinery that allows productivity nearly unachievable with human labor. Cranes are a common example used for different human industry tasks. The working principle of cranes makes it easier for engineers to lift or lower heavy loads while erecting buildings. Logistics and calculations are crucial aspects of any construction project. They ensure operator and equipment safety, and prevent overloading risks.

Project managers apply the lifting moments value to determine the weight restrictions of a specific task. This enhances precision and reduces downtime. In this write up, we aim to provide you with the fundamentals of a crane's lifting moment. Let's get started!      


Lifting Moment of a Crane: What Is It?

The crane types available in the market today have varying operating principles. That said, one of the parameters you should take into consideration while determining their suitability for your project is the lifting moment.

This is the principle that guides crane operators on the safety considerations. Using the lifting moment value, an operator is able to assess the working area requirements, and potential hazards.

What Is a Lifting Moment Limiting Device?

A load’s weight should not surpass a crane’s critical values. This is why the machinery should have a lifting moment limiting device that keeps track of any ‘unusual’ movement that can cause overloading. In occasions where the maximum lifting moment is exceeded, the value guides the crane operator on the right cause of action.

The limiting device can also be beneficial when the need to maintain and repair cranes arises. They provide valuable data which can be assessed to determine the level of maintenance required to service a crane.

Crane Load Chart: What Exactly Is It?

Crane builders need an efficient way to determine the weight requirements of varying configurations. The load chart is a reliable representation of the crane’s functioning details. In fact, manufacturers and operators are legally obligated to use it for enhanced safety. The components are:

● Capacity deductions - these are the factors affecting the load capacity like environmental conditions, hardware and crane load.

● Lifting capacity - this is basically what the load that the crane can handle.

● Boom angle - the boom angle is used to calculate the crane’s stability.

● Boom length - the maximum reach of the crane's arm.

● Lift Range - the boom length and radius determine the lifting and moving area of the crane.

● Operational notes - any additional information crucial to the crane's operation.

Factors That Influence a Crane’s Lifting Moment

The Cranes Motion

When a crane is operating in a stationary state, it has a high load capacity compared to when it is moving. It is essential that the crane operator understands this factor during operation, as it allows for efficient maneuvering of commands using the control components.

The Crane Configuration

There is a wide range of crane configurations based on the type and components. The configurations of these parts influence the lifting moment increasingly when they are in motion.

Operating Condition

Extreme weather or site conditions can influence safety during operation. Examples of these conditions are temperature, wind, and landscape.


Lifting a load exceeding the required lifting capacity can be hazardous. For this reason, the crane operator should have an in-depth understanding of the restrictions.

How Do I Determine a Crane’s Lifting Moment Without a Load Chart?

Contact the Manufacturer - Crane operators can also contact the manufacturer and submit an enquiry or a request to have a respective crane load chart. Manufacturers often archive operating manuals for all machineries that can be easily accessed should a need arise.

Download the Operator Manual - Manufacturer’s websites provide operator manuals for different types of cranes. Therefore, crane operators can access a manufacturer’s website, download, and print a full manual.

Hire A Professional To Conduct Inspection - There are professionals who can carry out crane inspections and further assessments to provide informed decisions about load capacities at different boom lengths. Provisions are in place to determine whether a professional is permitted to carry out safety checks on machines that lack operating manuals from manufacturers. They provide that should a manufacturer lack a load chart, then a professional should be contacted to make developments.


The lifting moment of a crane is an essential safety consideration for enhanced operation safety. Other important parameters are working conditions and crane stability. Ensure you consider the desired mobility of the crane when choosing a type.

At Xuzhou BOB-LIFT we understand varying project site requirements, hence the dedication of our development team in providing you with top quality cranes. Contact us today for a prompt quote!

Xuzhou BOB-LIFT Construction Machinery Co., Ltd. is a high-tech enterprise specializing in the design, development, manufacture and sales of truck-mounted cranes. With a factory area of over 37,000 square meters, the company's main products include SQ08-SQ55 series of folding and telescopic boom truck-mounted cranes and related variants such as truck mounted crane, marine crane, pickup crane.




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