SAFETY INFORMATION
TMS800E13 OPERATOR MANUAL
2-8
Published 02-06-2014, Control # 495-00
•
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.
Do not rely on the crane’s tipping to determine your lifting
capacity.
Be sure the hoist line is vertical before lifting. Do not subject
the crane to side loading. A side load can tip the crane or
cause it to fail structurally.
Load Chart
capacities are based on freely suspended loads.
Do not pull posts, pilings, or submerged articles. Be sure 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 crane will lean toward the boom and
the load will swing out, increasing the load radius. Ensure the
crane’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 crane from service if the
boom is damaged.
Never push or pull with the crane boom.
Avoid sudden starts and stops when moving the load. The
inertia and an increased load radius could tip the crane over
or cause it to fail structurally.
Use only one hoist at a time when lifting loads.
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 wire rope.
Counterweight
On cranes equipped with removable counterweights, ensure
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.
[29CFR 1926.1434]
Outrigger Lift Off
Regarding “lifting” of an outrigger pad during craning
activities, be advised that the rated loads for these cranes,
as indicated on the crane’s
Load Chart
, do not exceed 85%
of the tipping load on outriggers as determined by SAE J765
OCT90 “Cranes Stability Test Code.” An outrigger pad may
lift off the ground during operation of the crane within the
capacity limits of the
Load Chart
, yet the crane will not have
reached instability. The “balance point” for stability testing
according to SAE and Manitowoc criteria is a condition of
loading wherein the load moment acting to overturn the
crane is equal to the maximum moment of the crane
available to resist overturning. This balance point or point of
instability for a crane 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 crane’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 crane is properly set up, the crane is in good
working condition, that all operator’s aids are properly
programmed, that the qualified crane operator adheres to
the instructions found in the applicable
Load Chart
,
Operator’s Manual
and decals on the crane, the crane
should not be unstable.
Multiple Crane Lifts
Multiple crane lifts are not recommended.
Any lift that requires more than one crane must be precisely
planned and coordinated by a designated person. If it is
necessary to perform a multi-crane lift, the operator shall be
responsible for assuring that the following minimum safety
precautions are taken:
•
Secure the services of a designated person to direct the
operation.
•
Use one qualified signal person.
•
Coordinate lifting plans with the operators, designated
person, and signal person prior to beginning the lift.
•
Maintain communication between all parties throughout
the entire operation. If possible, provide approved radio
equipment for voice communication between all parties
engaged in the lift.
•
Use outriggers on cranes so equipped.
•
Calculate the amount of weight to be lifted by each crane
and attach slings at the correct points for proper weight
distribution.
Reference Only
