Hook tram point measurements (before and
Test weights lifted
Crane condition inspection record item
Test procedures paragraph numbers
performed, as outlined in NAVFAC P-307
The memorandum must be signed by the test
director, the mechanical inspector, and the certifying
The original is filed in the appropriate
equipment history jacket. One copy is filed in the unit
safety office, and the second copy is kept in an
accessible protected container on the crane. The
certification date is stenciled with 3-inch stencils on
the operators side of the revolving house.
Frequency of Test
The command schedules each crane for periodic
condition and load tests. Test are conducted before
placing any crane into initial use. Cranes stored or
idle for 6 months or more must be inspected and
tested before returning to service. ANY MACHINE
T H A T H A S H A D M A J O R R E P A I R S OR
REPLACEMENT OF LOAD BEARING OR
CONTROLLING PARTS WILL ALSO BE TESTED
BEFORE IT IS PUT BACK IN SERVICE. The
definitions of load bearing and controlling are only
those parts and components that support the load and
whose failure would result in uncontrolled dropping,
shifting, or moving of the load. Tests may be
conducted as frequently as local authorities deem
advisable (not to exceed 12 months between tests).
After the crane has passed the test procedures, the
mechanics will place the NMCB unit identification
marking decal on the crane in the correct locations.
Extension of Certification
The commanding officer may approve in writing
a temporary extension of the prior annual certification
when an emergent or other contingent conditions
exists precluding the timely certification of the crane.
The authority to extend certifications cannot be
delegated. Before you extend the certification, the
crane must pass a complete condition inspection.
Loss in terms of lives, injuries, and equipment can
bc dccrcascd with positive action and the use of safe
operating techniques by all Seabees working on or
Most crane mishaps result from operator error.
Setting up for the lift is the most critical portion of the
The most common causes of
mishaps are as follows:
Failure to block/crib under the outriggers pads
where poor ground conditions would not
support the total weight of the crane and load.
Failure to extend the outriggers fully and use it
following the manufacturers instructions.
Failure to note overhead obstructions, such as
overpasses and power lines.
Failure to level the crane.
The rated capacities of mobile cranes are based on
both strength and stability. Manufacturers of cranes
will normally denote on the load charts a shaded area
or a bold line across the chart dividing the lifting
capacities based on strength or stability of the crane.
It is extremely important to know the difference for, in
one case, one of the structural components of the
crane will break, and in the other case, the crane will
tip over. The following factors must also be
recognized and the capacity adjusted accordingly:
Do not use stability to determine lifting
capacity. Use the load chart installed by the
crane manufacturer. The load chart is securely
attached in the operators cab.
Recommended parts of hoist reeving and the
recommended size and type of wire rope for
various crane loads.
Length of boom.
Boom pendant angle (when the telescopic/
folding gantry is down, the angle decreases
and the stress increases).
Gantry and/or live mast in the highest
Quadrant of operation (that is, over the side,
over the rear capacities).