TM 10-3950-672-10
5-3.8
Using Load Chart.
NOTE
One of the most important tools of every crane is the load chart found in the operator's cab.
Refer to Figure 5-2 as required.
The load chart contains a large amount of information, which must be thoroughly understood by the operator.
The load chart contains a Range Diagram, Lifting Area Diagrams, one On Outriggers Chart, and one On Rubber
Capacity Chart.
The capacity charts are divided into capacities limited by structural strength and capacities limited by stability.
This is shown by the bold line across the chart. Capacities above the line are limited by structural strength and capacities
below the line are limited by crane stability.
Another important section of the load chart is the range diagram. The range diagram illustrates the tip height
which can be achieved at each boom length, angle, and radius. If the operator knows the radius required for a specific
lift and the tip height necessary, he can calculate the required boom length and angle needed for the lift. He then checks
the capacity chart for the specific boom length and radius to find out if the crane is capable of performing the lift safely.
Or, on the other hand, if the boom length and angle are known, the radius can be determined from the range diagram.
Figure 5-2. Terms to Know When Using Load Chart
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