8.9.10.11.Hook tram point measurements (before andafter measurements)Test weights liftedCrane condition inspection record itemnumbers inspectedTest procedures paragraph numbersperformed, as outlined in NAVFAC P-307The memorandum must be signed by the testdirector, the mechanical inspector, and the certifyingofficer.The original is filed in the appropriateequipment history jacket. One copy is filed in the unitsafety office, and the second copy is kept in anaccessible protected container on the crane. Thecertification date is stenciled with 3-inch stencils onthe operator’s side of the revolving house.Frequency of TestThe command schedules each crane for periodiccondition and load tests. Test are conducted beforeplacing any crane into initial use. Cranes stored oridle for 6 months or more must be inspected andtested before returning to service. ANY MACHINET H A T H A S H A D M A J O R R E P A I R S ORREPLACEMENT OF LOAD BEARING ORCONTROLLING PARTS WILL ALSO BE TESTEDBEFORE IT IS PUT BACK IN SERVICE. Thedefinitions of load bearing and controlling are onlythose parts and components that support the load andwhose failure would result in uncontrolled dropping,shifting, or moving of the load. Tests may beconducted as frequently as local authorities deemadvisable (not to exceed 12 months between tests).After the crane has passed the test procedures, themechanics will place the NMCB unit identificationmarking decal on the crane in the correct locations.Extension of CertificationThe commanding officer may approve in writinga temporary extension of the prior annual certificationwhen an emergent or other contingent conditionsexists precluding the timely certification of the crane.Theauthoritytoextendcertificationscannotbedelegated.Before you extend the certification, thecrane must pass a complete condition inspection.CRANE SAFETYLoss in terms of lives, injuries, and equipment canbc dccrcascd with positive action and the use of safeoperating techniques by all Seabees working on oraround cranes.StabilityMost crane mishaps result from operator error.Setting up for the lift is the most critical portion of thecrane operation.The most common causes ofmishaps are as follows:1.2.3.4.Failure to block/crib under the outriggers padswhere poor ground conditions would notsupport the total weight of the crane and load.Failure to extend the outriggers fully and use itfollowing the manufacturer’s instructions.Failure to note overhead obstructions, such asoverpasses and power lines.Failure to level the crane.Load CapacityThe rated capacities of mobile cranes are based onboth strength and stability. Manufacturers of craneswill normally denote on the load charts a shaded areaor a bold line across the chart dividing the liftingcapacities based on strength or stability of the crane.It is extremely important to know the difference for, inone case, one of the structural components of thecrane will break, and in the other case, the crane willtip over. The following factors must also berecognized and the capacity adjusted accordingly:1.2.3.4.5.6.7.Do not use stability to determine liftingcapacity. Use the load chart installed by thecrane manufacturer. The load chart is securelyattached in the operator’s cab.Recommended parts of hoist reeving and therecommended size and type of wire rope forvarious crane loads.Length of boom.Boom angle.Boom pendant angle (when the telescopic/folding gantry is down, the angle decreasesand the stress increases).Gantry and/or live mast in the highestposition.Quadrant of operation (that is, over the side,over the rear capacities).3-20
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