should be removed. In certain instances, it is advantageous, from a job set-up point of
view, to lift over the boom point with the jib erected. In these instances, it is necessary to
make deductions from the rated loads shown in the load rating chart “Jib Erected But Not
Used“ to determine the correct rated load. Hook blocks or any specialty items should be
removed from the jib point when lifting over the main boom point.
Also, there are deductions for jib operation due to hook blocks hanging on the main boom
point. In this circumstance, reduce the jib capacity by the weight of the hook block and/or
other specialty items hanging from the main boom point.
Cut-Offs:
Rated chart values of less than 1,000 lbs. for on outriggers, side-stow and stow-away jibs
are not shown. On rubber values less than 600 lbs. are not shown. This is done because
the effects of wind, pendulum action, jerking, etc., can cause a tip over. Therefore:
Extending the boom or boom and jib combination into unrated areas of the chart
can cause tip over. See Note 19 on Load Chart.
NOTE: 19. CRANE LOAD RATINGS WITH AN ASTERICK (*) BESIDE THEM ARE
BASED ON THE CRANE’S STUCTURAL STRENGTH. ALL OTHER RATINGS ARE
BASED ON STABILITY AND DO NOT EXCEED THE SPECIFIED PERCENTAGE OF
TIPPING LOAD AS DETERMINED BY SAE CRANE STABILITY TEST CODE J- 765A.
Note on the accompanying examples that a significant portion of the range of the machine
is unrated. The side stow jib at 30° offset, with full boom is longer than 123 ft. but is cutoff
at 123 ft. radius. The “On Tire” chart shows the crane cannot be operated beyond a 60 ft.
radius on tires.
Do not operate at a longer radius than those listed on the applicable load rating
charts as tipping can occur without a load on the hook.
101P/N 12261-319 REVISED: August 2012
Courtesy of Crane.Market
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