SAFETY INFORMATION 800D
1-4
Published 5-27-2018 Control # 039-06
As operator of this crane, you are granted the authority to
stop and refuse to lift loads until safety is assured.
OPERATIONAL AIDS
Operational aids are accessories that provide information to
facilitate operation of a crane or that take control of particular
functions without action of the operator when a limiting
condition is sensed. Examples of such devices include, but
are not limited to, the following: anti-two-block device, rated
capacity indicator, rated capacity limiter, boom angle or
radius indicator, boom length indicator, crane level indicator,
hoist drum rotation indicator, load indicator, and wind speed
indicator.
National Crane remains committed to providing reliable
products that enable users and operators to safely lift and
position loads. National Crane has been an industry leader in
the incorporation of operational aids into the design of its
cranes. Federal law requires that cranes be properly
maintained and kept in good working condition. The manuals
that National Crane provides that are specific for each crane
and the manufacturer’s manuals for the operational aids
shall be followed. If an operational aid should fail to work
properly, the crane user or owner must assure that repair or
recalibration is accomplished as soon as is reasonably
possible. If immediate repair or recalibration of an
operational aid is not possible and there are exceptional
circumstances which justify continued short-term use of the
crane when operational aids are inoperative or
malfunctioning, the following requirements shall apply for
continued use or shutdown of the crane:
• Steps shall be taken to schedule repairs and
recalibration immediately. The operational aids shall be
put back into service as soon as replacement parts, if
required, are available and the repairs and recalibration
can be carried out. Every reasonable effort must be
made to expedite repairs and recalibration.
• When a Load Indicator, Rated Capacity Indicator, or
Rated Capacity Limiter is inoperative or malfunctioning,
the designated person responsible for supervising the
lifting operations shall establish procedures for
determining load weights and shall ascertain that the
weight of the load does not exceed the crane ratings at
the radius where the load is to be handled.
• When a Boom Angle or Radius Indicator is inoperative
or malfunctioning, the radius or boom angle shall be
determined by measurement.
• When an Anti-Two-Blocking Device, Two-Blocking
Damage Prevention Device or Two-Block Warning
Device is inoperative or malfunctioning, the designated
person responsible for supervising the lifting operations
shall establish procedures, such as assigning an
additional signal person to furnish equivalent protection.
This does not apply when lifting personnel in load-line
supported personnel platforms. Personnel shall not be
lifted when anti-two-block devices are not functioning
properly.
• When a Boom Length Indicator is inoperative or
malfunctioning, the designated person responsible for
supervising the lifting operations shall establish the
boom lengths at which the lift will be made by actual
measurements or marking on the boom.
• When a Level Indicator is inoperative or malfunctioning,
other means shall be used to level the crane.
Rated Capacity Limiter (RCL) Systems (If
Equipped)
Your crane may be equipped with an RCL system which is
intended to aid the operator. An RCL is a device that
automatically monitors radius, load weight, and load rating
and prevents movements of the crane, which would result in
an overload condition.
Test daily for proper operation. Never interfere with the
proper functioning of operational aids or warning devices.
Under no condition should it be relied upon to replace the
use of Load Charts and operating instructions. Sole reliance
upon these electronic aids in place of good operating
practices can cause an accident.
Know the weight of all loads and always check the capacity
of the crane as shown on the Load Chart before making any
lifts.
NEVER exceed the rated capacity shown on the Load Chart.
Always check the Load Chart to ensure the load to be lifted
at the desired radius is within the rated capacity of the crane.
For detailed information concerning the operation and
maintenance of the RCL system installed on the crane, see
the RCL manufacturer’s manual supplied with the crane.
Manufacturers of rated capacity limiters may refer to them in
their manuals as a load moment indicator (LMI), a hydraulic
capacity alert system (HCAS); National Crane refers to these
systems as a rated capacity limiter (RCL) throughout its
Operator and Service Manuals.)
Anti-Two-Blocking Device
This crane should have a functional Anti-Two-Block and
Control Lock-Out System. Test daily for proper operation.
Two-blocking occurs when the load block (hook block,
headache ball, rigging, etc.) comes into physical contact with
the boom (boom nose, sheaves, boom extension, etc.). Two-
blocking can cause hoist lines (wire rope), rigging, reeving,
and other components to become highly stressed and
overloaded in which case the rope may fail allowing the load,
block, etc. to free fall.
Two-blocking is more likely to occur when both the main and
auxiliary hoist lines are reeved over the main boom nose and
Fo
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