Manitowoc Published 10-01-12, Control # 044-05 v2 3-63
777 OPERATOR’S MANUAL OPERATING CONTROLS AND PROCEDURES
3
WIND CONDITIONS
Wind adversely affects lifting capacity and stability as shown
in Figure 3-36. The result could be loss of control over the
load and crane, even if the load is within the crane’s capacity.
For wind conditions specific to this crane, see Wind
Conditions Chart at end of this section or, if applicable, see
wind conditions in Capacity Charts provided with crane and
attachments.
Wind speed (to include wind gusts) must be monitored by job
planners and supervisors.
Beware that wind speed at boom or jib point can be greater
than wind speed at ground level. Also beware that the larger
the sail area of the load, the greater the wind’s affect on the
load.
As a general rule, ratings and operating speeds must be
reduced when:
Wind causes load to swing forward past allowable
operating radius or sideways past either boom hinge
pin.
WARNING
TIPPING CRANE HAZARD!
Judgment and experience of qualified operators, job
planners, and supervisors must be used to compensate
for affect of wind on lifted load and boom by reducing
ratings, reducing operating speeds, or a combination of
both.
Failing to observe this precaution can cause crane to tip or
boom and/or jib to collapse. Death or serious injury to
personnel can result.
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