TM 5-3810-307-10
DO NOT OVERLOAD THE CRANE by exceeding the capacities shown on the
appropriate load chart. Death or serious injury could result from the crane tipping over or failing
structurally from overload.
Do not rely on the crane's tipping to determine your lifting capacity.
If you should encounter a tipping condition, immediately lower the load with the hoist
line and retract or elevate the boom to decrease the load radius. Never lower or extend the boom,
this will aggravate the condition.
Be sure the load is properly rigged and attached. Always determine the weight of
the load before you attempt to lift it and remember that all rigging (slings, etc.) and lifting devices
(hook block, jib, etc.) must be considered part of the load.
Measure the load radius before making a lift and stay within approved lifting areas
based on the range diagrams and working area diagrams on the crane's load chart.
Verify the crane's capacity by checking the load chart against the weight of the load,
then lift the load slightly at first to ensure stability before proceeding with the lift.
Always keep the load as near to the crane and as close to the ground as possible.
The crane can tip over or fail structurally if;
the load and crane's configuration is not within the capacity as shown on the
applicable load rating chart and notes.
the ground is soft and/or the surface conditions are poor.
outriggers are not properly extended and set. On models equipped with
outriggers that can be pinned at the mid-extend position, the outriggers must
also be pinned when operating from the mid-extend position.
cribbing under the outrigger pads is inadequate.
the crane is improperly operated.
Wind and other factors such as boom length, boom angle, size and weight of load
being lifted, etc., can affect crane stability and crane structures. Practical working loads for each
particular job and lift shall be established by the user depending upon conditions that exist at the
time a lift is being made. Appropriate capacity reductions shall be made whenever conditions
indicate the possibility that a loss of crane stability or structural damage could occur. Be extremely
cautious if wind velocity approaches 20 mph (32 km/h). The crane should not be operated at winds
above 30 mph (48 km/h).
The crane cab is equipped with a sight level bubble that should be used to
determine whether the crane is level. The load line can also be used to estimate the levelness of
the crane by checking to be sure it is in-line with the center of the boom at all points on the swing
circle.
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