The second is the Range Diagram, which provides a snapshot of the boom position when looking at height, radius, and boom angle. The first is the Load Ratings Chart, which provides the crane capacities at certain boom angles and radius. For all charts, if work is being performed at a boom length not defined on the load chart, the operator must use the load/capacity rating at the next longest defined boom length on the chart for a given radius. There are two charts that make up a spec sheet. Each crane has a load chart that, in short, specifies the crane’s capabilities - detailing its features and how its lift capacity varies when considering distance and angle.Using the Elliott 26105F Boom Truck technical specification sheet as a reference, this article will walk you through the method of reading a load chart.
Just like the old saying ‘if you fail to plan, you plan to fail,’ failing to consult a crane load chart before renting or employing a crane for a specific job could leave you with too much or too little capacity for your job.īefore a crane is rented, transported, employed or purchased, the crane chart must be consulted. To illustrate how to read a crane chart, we’ve chosen the chart for the Terex RT345XL, a rough terrain crane with a maximum lift capacity of 45 tons.ġ.Įveryone, from the crane operator, to the job supervisors, to even the sales guys have to know how to read a crane chart. It includes data for operation with the outriggers extended, transport weight, and steering dimensions.ĭIMENSIONS and WEIGHT - The chart shows the crane dimensions. Knowledge of this information is especially critical if the crane will be working in a confined space, as the lifting capacity varies depending on whether the outriggers are extended. The transport weight (below) determines the trailer to be used, how to load the crane on the trailer, the route to take, and what permits are required to get it to the jobsite.Īlong the top axis, the first number is the gross vehicle weight. In the other two columns, the arrows indicate the weight load for each axle depending on what additional accessories are loaded.Ģ. LIFT CAPACITY - This is where the magic happens. In the legend at the top of the chart, you can see these ratings apply when using 6.5 tons of counterweight, with the outriggers extended to 22 x 22.3 feet.
Here, you’d graph out the specific lift the crane is needed for.
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