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5.2 DIAGRAM OF WORKING RADIUS AND LIFTING HEIGHT
• The working radius/lifting height shows relationship between working radius, boom
angle and lifting height above ground of this machine with no load hoisted, and
deflection of the boom is not included.
• Status (4) shown in the “diagram of working radius and lifting height” is observed
when half of the “
mark” is exposed from the 3rd boom.
1. In the figure on the right, point A denotes a boom angle
and point B denotes a lifting height above ground.
The same working radius applies to point A and point B.
2. The “diagram of working radius and lifting height”
shows the relationships between 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 widen
slightly.
The rated total load decreases with increase in the working radius. Actual crane operation
requires the planning of work, allowing for sufficient clearance more than that provided in the
diagram.
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