Load Rating Chart Interpretation
In the following pages are examples of a load chart, these example charts may differ from
the chart supplied with your crane. Always use the load rating chart supplied with the crane
to interpret the conditions and limitations that exist when making a lift with the crane. The
determining factors are lifted load, radius, boom angle, working position, hoist line reeving,
tire pressure, travel data, use of a jib, and other special conditions that exist, such as wind
velocity, soil conditions, etc.
DEFINITIONS OF LOAD CHART TERMS
Lifted Load: The lifted load is the total weight of all the items suspended on the wire rope.
Example:
Hook Block 750 lbs.
Slings 215 lbs.
Object Lifted 19,000 lbs.
Lifted Load 19,965 lbs.
Load Radius: The horizontal distance from the axis of rotation before loading to the center
of the vertical hoist line or tackle with a load.
Loaded Boom Angle: It is the angle between the boom base section and the horizontal,
after lifting the rated load at the rated radius. The boom angle before loading should be
greater to account for deflections. The loaded boom angle combined with the boom length
give only an approximation of the operating radius.
Freely Suspended Load: Load hanging free with no direct external force applied except by
the hoist rope.
Side Load: Horizontal force applied to the lifted load either on the ground or in the air.
No Load Stability Limit: The stability limit radius shown on the range diagrams is the radius
beyond which it is not permitted to position the boom, when the boom angle is less than
the minimum shown on the applicable load chart, because the machine can overturn
without any load.
Over Rear, over Side and 360°: The “crane working position” diagram is a view looking
straight down on the crane with the upper structure and the boom removed. “Over Rear”
when the crane is on outriggers is the area inside the arc bounded by lines from the center
line of rotation through the rear outrigger vertical jack cylinders.
“Over Side” when the crane is on outriggers is the area inside the arc bounded by lines
from the center line of rotation through the rear outrigger vertical jack cylinders and a line
passing thru the front vertical jack cylinders.
“360°”means the load can be swung to any position around the crane.
360° capacities apply only to machines equipped with a front outrigger jack and all five(5)
outrigger jacks properly set. If the front (5th) outrigger jack is not properly set, the work
T300-1_T500-1_T780
Operating Instructions
196 P/N 12261-683
REVISED: January 2015
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