TM 10-3950-672-10
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. The load chart also gives weight reductions for Grove load
handling devices such as hook blocks, headache balls, boom extension section, etc., which must be taken into
consideration as part of the load. Remember, 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.
NOTE
The information in the following paragraph is an example of how to compute a lift, but the
numbers used in the example may not coincide with the load chart in the cab.
To understand the uses of the load chart, a typical example of a lifting problem is offered. Determine whether or
not the lift can be made safely. The problem is to lift an air conditioning unit weighing 2,350 lbs (1,066 kg), which is
secured by bolted wood blocking and located between aisles of outside storage. The air conditioning unit is to be loaded
on a flat bed truck located in an open loading area 50 ft (15.24 m) from the storage area. Further, the distance between
the aisles prevent performing the lifting operation with the crane on outriggers. The crane is equipped with the 10.6 to 24
ft (3.0 to 7.3 m) three-section boom. By measuring the center of the load, in relation to the center line of rotation of the
crane, the radius is determined to be 18 ft (5.4 m). Checking the load charts in the crane cab indicates that 3,000 lbs
(1,360.8 kg) may be safely lifted at an 18 ft (5.4 m ) radius.
NOTE
The weights of all load handling devices are considered part of the load lifted and suitable
allowances for them should be made.
A sling and spreader bar are also required to perform the lift; therefore, it is mandatory that the combination
weight be added to the unit being lifted. The new total weight is now 2,425 lbs (1,000 kg). A double check of the load
chart reveals the lift may still be made safely. Although this lift may be performed with reasonable ease, a good craning
practice may be exercised by extending and setting the outriggers if equipped when hoisting the load onto the flat bed
truck.
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