Folio 1113-3
SAFE OPERATING PRACTICES
a. Park the crane (if mobile) and position the
upperworks so the crane does not interfere with
operation of other equipment.
b. Apply the travel and swing brakes or locking
devices.
c. Land any attached load.
d. Lower the boom onto blocking at ground level or
onto a boom rest if possible; otherwise, securely
fasten the boom from movement by wind or other
outside forces.
e. Move all controls to off.
f. Apply all drum brakes and pawls.
g. Disengage the master clutch, if equipped.
h. Stop the engine.
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 the landing area shall be
illuminated.
15. The operator shall not operate the crane during periods
of bad weather if his ability to see the load or the signal
person is impaired by darkness, fog, rain, etc.
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 the boom by reducing ratings,
reducing operating speeds, or a combination of both.
Unless otherwise specified on the capacity chart, or in
Crane Instruction 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 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.
17. Booms, jibs, or masts which are being assembled or
disassembled on the ground (with or without support of
boom rigging) shall be securely blocked to prevent
dropping of boom, jib, or mast sections.
Workers shall not go under boom, jib, or mast sections
when removing connecting pins or bolts.
HANDLING LOAD
Size of Load
1. The crane shall not be loaded beyond the applicable
static or dynamic ratings given on the capacity chart for
the crane.
NOTE: The capacity charts for Manitowoc cranes show the
total weight of freely suspended loads for various
boom lengths and operating radii.
To determine the actual weight of the load which
can be lifted at a given radius (working load), the
operator must deduct the weight of certain lifting
equipment from the total weight given on the chart.
Refer to the specific capacity chart for your crane
for a list of the lifting equipment which must be
deducted.
The operator’s judgment must be used to further
reduce the total weight to allow for the dynamic
effects of swinging, hoisting, or lowering, and
adverse weather conditions to include wind.
2. The operator or qualified person directing the lift shall
verify that weight of the load is within the static or
dynamic rating for the radius at which the load will be
lifted.
Verified weights and measured radii shall take
priority over load indicator readings.
Attaching Load
1. Attach the hook to the load with slings, or other suitable
rigging. Each hook shall have a latch that is in proper
working order.
Hook latches shall not be wired open.
2. Only use slings and other rigging that are in safe
operating condition and have a rating equal to or greater
than the load to be lifted.
3. Do not wrap the load line around the load.
4. Use suitable protection between slings and any sharp
edges on the load.
5. Secure unused legs of a multi-leg sling before handling a
load with one leg of the sling.
Lifting/Moving Load
1. Before lifting or moving the load, the operator or qualified
person directing the lift shall make the following checks:
a. Crane has a firm uniformly supporting foundation
under both crawlers, all tires, or each outrigger jack
pad or float. Unless otherwise specified on capacity
chart, foundation shall be
level to within 1%
— 1 ft
(0.3 m) rise or fall in 100 ft (30.5 m) distance.
When such a surface is not available, it shall be
provided with timbers, cribbing, or other structural
members to distribute the load such that the
allowable bearing capacity of the underlying
member is not exceeded.
Contact Service Department at Manitowoc for
ground bearing data.
395143
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