The load chart contains a Range Diagram, Lifting Area Diagrams, an On Outriggers
Capacity Chart, and On Rubber (Stationary and Pick & Carry) Capacity Charts.
The capacity charts are divided into two areas, separated by a bold line. Capacities
appearing below the bold line are limited by the crane's stability (overloading of the crane in any of
the listed configurations would result in the crane tipping before any structural damage occurred).
Capacities above the bold line are limited by the structural strength of the crane (overloading the
crane in any of these configurations would likely result in structural damage before tipping of the
crane occurred). It is never permissible to exceed any capacity figure appearing in the charts, and it
is important to never rely on tipping as a means of determining the crane's lifting capacity,
particularly with regard to capacities appearing above the bold line.
The capacities appearing in the capacity charts are the "rated" capacities of the
crane, and represent the maximum loads that may be placed on the crane hook in each of the
configurations identified in the tables. A table is included in the load chart which gives weight
reductions for the Grove furnished clamshell and grapple. When using these attachments, their
weight must be deducted from the capacities listed in the charts. Any other load handling devices
such as chains, slings, or spreader bars must also be considered, and the weight of these devices
must be added to the weight of the load or deducted from the listed capacities. The weight of the
hook block supplied with the crane was considered when the rated capacities were established in
the charts, so no deduction is required for hook block weight. Another thing to remember is that the
capacities listed in the charts do not take into account the number of parts of line required to lift a
particular load. The operator must therefore calculate the number of parts of line required to lift a
load using the "Line Pulls and Reeving Information" table included in the load chart, configure the
crane appropriately, and enter the information into the LMI prior to attempting the lift. To determine
the parts of line required, the weight of the load to be lifted is divided by the permissible line pulls
figure appearing in the table, and rounding UP the result to the next whole number. This number is
the "parts of line" to be reeved and entered into the LMI.
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.
A lifting area diagram is included as part of the load chart to describe over side, over
rear, and over front lifting areas. An examination of the lifting area diagram shows that the locations
of the outriggers in the fully extended position are used to mark the boundaries of the lifting areas.
The last major portion of the load chart is the section concerning notes to lifting
capacities. Be sure to read all notes carefully so you understand what each one means.