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NATIONAL CRANE
Published 11-01-2020 Control # 710-00
2-19
NBT60XL OPERATOR MANUAL
SAFETY PRECAUTIONS
2
Always keep the load as near to the equipment and as close
to the ground as possible.
Do not overload the
equipment by exceeding the capacities
shown on the appropriate
Load Chart
. Death or serious
injury could result from the equipment tipping over or failing
structurally from overload.
The equipment can tip over or fail structurally if:
•
The load and equipment’s configuration is not within the
capacity as shown on the applicable
Load 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 intermediate positions, the outriggers must also be
pinned when operating from the intermediate position.
•
Cribbing under the outrigger pads is inadequate.
•
The equipment is improperly operated.
Do not rely on the equipment’s tipping to determine your
lifting capacity.
Make sure that the hoist line is vertical before lifting. Do not
subject the equipment to side loading. A side load can tip the
equipment or cause it to fail structurally.
Load Chart
capacities are based on freely suspended loads.
Do not pull posts, pilings, or submerged articles. Make sure
that the load is not frozen or otherwise attached to the
ground before lifting.
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.
Use tag lines whenever possible to help control the
movement of the load.
When lifting loads, the equipment will lean toward the boom
and the load will swing out, increasing the load radius. Make
sure that the equipment’s capacity is not exceeded when this
occurs.
Do not strike any obstruction with the boom. If the boom
should accidentally contact an object, stop immediately.
Inspect the boom. Remove the equipment from service if the
boom is damaged.
Never push or pull with the boom.
Avoid sudden starts and stops when moving the load. The
inertia and an increased load radius could tip the equipment
over or cause it to fail structurally.
Using only one hoist at a time when lifting loads is
recommended. See “Tilt-Up Panel Lifting” on page 2-20 for
additional lifting instructions.
Always use enough parts-of-line to accommodate the load to
be lifted. Lifting with too few parts-of-line can result in failure
of the hoist rope.
Counterweight
On equipment that features removable counterweights,
make sure that the appropriate counterweight sections are
properly installed for the lift being considered.
Do not add material to the counterweight to increase
capacity. United States Federal law prohibits modification or
additions which affect the capacity or safe operation of the
equipment without the manufacturer’s written approval.
[OSHA 29CFR 1926.1434]
Outrigger Lift Off
Regarding “lifting” of an outrigger pad during loaded
equipment functions, be advised that the rated loads for
these equipment, as indicated on the
Load Chart
, do not
exceed 85% of the tipping load on outriggers as determined
by SAE J765 JUNE2017 “Equipment’s Stability Test Code.”
An outrigger pad may lift off the ground during operation of
the equipment within the capacity limits of the
Load Chart
,
yet the equipment will not have reached instability. The
“balance point” for stability testing according to SAE and
National Crane criteria is a condition of loading wherein the
load moment acting to overturn the equipment is equal to the
maximum moment of the equipment available to resist
overturning. This balance point or point of instability for
equipment does not depend on “lifting” of an outrigger but
rather on comparison of the “opposing” load moments.
The occurrence of an outrigger lifting from the ground is often
attributed to the natural flex in the equipment’s frame. This
may happen when lifting a load in certain configurations
within the capacity limits of the
Load Chart
and is not
necessarily an indication of an unstable condition.
Provided the equipment is properly set up, the equipment is
in good working condition, that all operator’s aids are
properly programmed and setup, that the qualified operator
adheres to the instructions found in the applicable
Load
Chart
,
Operator Manual
and decals on the equipment, the
equipment should not be unstable.
Multiple Equipment Lifts
Multiple equipment lifts are not recommended.
Any lift that requires more than one equipment must be
precisely planned and coordinated by a qualified person. If it
is necessary to perform a multi-equipment lift, the operator
shall be responsible for assuring that the following minimum
safety precautions are taken:
•
Secure the services of a qualified person to direct the
operation.
Fo
r
Reference
Only
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