• The diagram of working radius and lifting height shows the relationships the working radius of
this machine, boom angle, and lifting height above the ground with no object hoisted. The
diagram has been made allowing for no deflection in the boom.
• The boom (4) in the diagram of working radius and lifting height represents a state that half of
the “
1. Point A denotes a boom angle and point B denotes a lifting
height above ground in the figure at right.
The same working radius is applied to points A and B.
2. The “diagram of working radius and lifting height” shows the
relationships the working radius, boom angle, and lifting
height at no load, allowing for no deflection in the boom.
A deflection occurs in the boom when an object is hoisted,
which causes the working radius to increase slightly.
The rated total load decreases with an increase in the
working radius. Actual crane operation requires the planning
of work, allowing for sufficient tolerance of more than that
shown in the diagram.
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