Manitowoc Published 10-01-12, Control # 044-05 2-29
777 OPERATOR’S MANUAL SAFETY INFORMATION
2
angle between horizontal and a line drawn through
centerline of the crane’s boom hinge pins.
Unless otherwise specified in the Capacity Chart, barge
list (heel or trim) must not exceed the machine list
degrees given in the Capacity Chart.
3. Barge List and Machine List are not same. As the crane
rotates on a barge, barge list (as defined above) will
change. The worst machine list condition generally
occurs when the crane swings over the corner of the
barge, producing maximum side load.
Crane Inspection
To aid in preventing harmful and damaging failure as
previously indicated, regular inspection for signs of
overloading in the following load bearing components is
required. Correct each defect found before placing the crane
into service.
• Boom
• Counterweight
• Backhitch
• Rotating Bed
• Wire Rope
• Pendants and Straps
• Hook and House Rollers
When equipped with hook rollers, it is recommended that
each hook roller assembly be inspected daily for any sign of
overloading, to include:
• Deformation of roller path.
• Proper hook roller adjustment.
• Deformation or cracks in hook roller hanger.
• Bent hook roller shaft.
• Damaged bearings.
Transporting Crane on Barge
If it is necessary to transport the crane on a barge, ship, or
floating platform when dynamic conditions will be
experienced, the boom shall be lowered onto a cradle (or
other support) and the crane’s boom, rotating bed, and
lowerworks shall be secured against movement. If the crane
is equipped with a mast, the mast shall be securely tied down
with guylines. Failing to take these steps can result in shock
load or side load damage to the boom and mast.
Barge Deck
L = Degrees of Machine List
(Maximum allowable is
specified in Capacity Chart)
FIGURE 2-12
C
L
Through Boom
Hinge Pins
Horizontal
L
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