Manitowoc Published 04-06-18, Control # 231-14 2-11
MLC650 VPC-MAX™ OPERATOR MANUAL SAFETY INFORMATION
13. The operator shall perform the following operations if
power or a control function fails during operation:
a. Land all suspended loads, if possible, under brake
or power control.
b. Apply all brakes and locking devices.
c. Move all controls to off.
14. If the crane will be operated at night, the operator shall
make sure that there is sufficient lighting for safe
operation. The load and landing area must be
illuminated.
15. The operator shall not operate the crane during periods
of bad weather if his/her ability to see the load or the
signal person is impaired by darkness, fog, rain, snow,
and the like.
Do not operate the crane with a snow or ice covered
boom. The extra weight may cause overload, tipping, or
structural damage.
Never operate the crane during an electrical
thunderstorm.
When a local weather storm warning exists (including
electrical thunderstorm), stop operation and secure the
crane. See step 12
on page 2-10.
NOTE DO NOT depend on grounding. Grounding of a
crane affords little or no protection from electrical
hazards. The effectiveness of grounding is limited
by the size of the conductor (wire) used, condition
of the ground, the magnitude of voltage and current
present, and numerous other factors.
16. Wind can cause the crane to tip or the boom and other
attachments to collapse. The operator or qualified
person directing the lift shall compensate for the effect of
wind on the load and boom by reducing ratings, reducing
operating speeds, or a combination of both.
Unless otherwise specified in the Capacity Chart, or
Operator Manual, stop operation under the following
wind conditions:
a. If the wind causes the load to swing forward past the
allowable operating radius or sideways past either
boom hinge pin, land the load and apply the drum
brakes.
b. If the wind exceeds 16 m/s (35 mph), land all loads
and apply the drum brakes, lower the boom onto
blocking at ground level or otherwise restrain it, and
apply the swing and travel brakes and/or locks.
NOTE “Land load” means to set it down on a firm
uniformly supporting surface.
17. Booms, jibs, or masts which are being assembled or
disassembled on the ground (with or without support of
boom rigging) must be securely blocked to prevent the
boom, jib, or mast sections from dropping.
Workers shall not go under boom, jib, or mast
sections when removing connecting pins or bolts.
18. Each outrigger must be visible to the operator or the
signal person during extension and retraction.
Handling Load
Size of Load
1. The crane must not be loaded beyond the applicable
static or dynamic ratings given in the Capacity Chart for
the crane configuration.
NOTE Capacity charts for Manitowoc cranes show the
total weight of freely suspended loads for various
boom and jib lengths and operating radii.
“Freely suspended load” is a load that is hanging
free with no direct external force applied except by
the crane’s load-line reeving.
To determine the actual weight of the load which
can be lifted at a given radius (working load), the
operator shall deduct the weight of certain lifting
equipment from the total weight given in the chart.
See the specific Capacity Chart for your crane for a
list of lifting equipment which must be deducted.
The operator’s judgment shall be used to further
reduce total load to allow for the dynamic effects of
swinging, hoisting, or lowering, and adverse
weather conditions to include wind.
2. The operator or other designated person directing the lift
shall verify that the weight of load is within the static or
dynamic rating for radius at which load will be lifted.
Verified weights and measured radii must take
priority over RCI/RCL readings.
Attaching Load
1. Attach the hook to the load with slings, or other suitable
rigging. Each hook must have a latch that is in proper
working order. Hook latches must not be wired open.
a. Inspect each hook and latch before using.
b. Never use a hook or latch that is distorted or bent.
c. Make sure spring will force the latch against the tip
of the hook.
d. Make sure the hook supports the load. The latch
must never support the load. Latches are only
intended to retain loose slings under slack
conditions.
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