What is a Crane Load Chart?
A crane load chart is a critical document that specifies the safe lifting capacity of a crane in various configurations. Understanding how to read and interpret load charts is essential for safe crane operation.
Key Load Chart Components
Lifting Capacity
The load chart shows the maximum weight the crane can lift at different boom angles, boom lengths, and radii. Capacity decreases as the boom extends or the load radius increases.
Boom Angle and Radius
The boom angle affects lifting capacity. A higher boom angle typically allows heavier lifts. The load radius is the horizontal distance from the center of rotation to the load center.
Configuration Variables
Factors affecting capacity include outrigger deployment (fully extended vs. retracted), boom length, jib attachment, and whether you are picking and carrying or lifting stationary.
How to Read a Load Chart
Start by determining your load weight and radius. Find the appropriate row for your boom length and column for your radius. The intersection shows the maximum safe capacity. Compare this to your actual load weight.
Common Load Chart Mistakes
Common errors include not accounting for rigging weight, using the wrong configuration settings, ignoring wind conditions, and misreading metric vs imperial units. Always double-check load chart readings.
Learn More
For a complete overview of mobile cranes, visit our Complete Guide to Mobile Cranes.
