If you need a rental crane for a construction project, you should understand some basics on safely operating this impressive piece of equipment. Crane lifting capacity is how much a crane can lift without augmentations or extra safety measures. You can typically find this figure displayed on the crane load capacity chart, but it isn’t as simple as all that.

Whether you’re new to renting cranes or need a refresher course, this quick guide can help you understand this machinery better before you go ahead and operate it. Hook Crane Services, a trusted crane service in Tucson, AZ, shares more below.

What Is Crane Lifting Capacity?

In short, crane lifting capacity is another term for crane weight limit. 

Every piece of heavy equipment can safely lift a specific number of pounds before the pressure causes problems. Cranes are no exception. 

The lifting capacity also determines the following:

• Load measurements: Crane load limits don’t depend on weight alone. They also specify the geometric measurements the equipment can handle. 
• Lift height: Knowing how high off the ground you can lift a load prevents frontward toppling. 
• Lift angle: Sharp angles can significantly reduce your load limits. Staying aware of how you maneuver the crane into an angle ensures you don’t overload it. 

The crane load chart contains most of the details regarding the lift capacity. However, before you move on, it’s wise to refresh your memory about general crane safety.

Understanding Your Crane Load Chart

Typically, you will find the load capacity chart in your user’s manual or manufacturer’s guide, along with other essential instructions on safely and effectively operating the crane. The manual may contain one or multiple charts, and you’ll see them in the crane’s operating cab, as well.

#1 Crane Load Chart Anatomy

First, let’s review the elements a load chart commonly features, as follows:

• The lifting capacity of cranes is the total tonnage the machinery can lift.
• The boom length is the crane’s total arm length. 
• The boom angle is between the ground and the crane’s arm.
• Capacity deductions refer to the weight you should subtract to account for the crane’s weight and other non-load accessories. 
• Operation notes help you account for environmental factors (like wind or ground slope). 

#2 Calculating the Load Radius

Cranes move their loads from side to side in a circular motion called the load radius. Smaller radiuses will dictate a higher maximum crane load. 

You can find the load radius by calculating the needed boom length and the position of the boom angle. 

#3 Find the Lifting Capacity

After calculating the load radius, check the chart for its representation and see the lifting capacity. Most charts offer notes about other factors you should consider before you operate the crane to move a load. However, lifting capacity depends on the crane’s weight distribution and structure. 

Always avoid moving the boom while you pivot the machine to prevent an accidental overload.   

#4 Predict Surrounding Environmental Factors

The environment can affect the overall operation methods and weight capacity of cranes in motion or at rest. Steep ground slopes cause cranes to roll over, and high winds can also tip the equipment or load. 

You’ll also need to look at ground compaction, which affects how a crane distributes its weight.

The Crane Experts Agree—Always Comply With OSHA’s Requirements

It’s wise to read through OSHA’s guidelines for safely operating cranes and other heavy machinery before you purchase, rent, or use a crane. It protects your team, the assets, and the overall project. 

For example, essential mandates to remember include the following:

• Don’t operate beyond the crane’s weight capacity: Overloading a crane is a dangerous, unpredictable game. It could tip or roll, leading to injuries or fatalities, legal action, and expensive destruction.
• Carefully review the load chart: Reviewing all reading materials before cranking up the crane prevents overloads and other potentially lethal situations. Not all cranes have the same capacities or operating requirements, so take care. 
• Retain load charts, manuals, and other guides in the cab at all times: Accessible safety and usage materials ensure that operators can look at them when needed. It saves time and protects projects. 
• Only allow certified personnel to handle cranes and similar equipment: Cranes are complex machines that make construction work easier while simultaneously posing potential risks. An experienced operator with certifications and licenses is a must. 

Contract Your Crane From Hook Crane Services

Do you have any questions about crane lifting capacity or other heavy equipment topics? Call 520-323-0963 to reach Hook Crane Services in Tucson, Arizona. We can also provide an estimate on crane rental for your upcoming project.