cranes have levels mounted on them, but thelevels are not always accurate. Use a 3-footbuilder’s level to check the level of the crane overthe rear and over the sides (fig. 3-15).After the test weights are figured, you mustremember that the hook blocks and rigging gearare weight that are part of the test weight. Themaximum test weight for this example is set up atthe 15-foot radius measurement over the side ofthe crane. Crane radius is the measurement fromthe center of rotation to the center of the hook (fig.3-16).The crane is weight-tested with the boomrotated ninety (90) degrees from the longitudinalaxis of the crane carrier. It is stronglyrecommended by NAVFAC P-307 that precautions,such as attaching guy wires to the mane or placingcribbing under the counterweight, be used topreclude possible overturning of the crane in theevent of wire rope or mechanical failure. Cribbingis normally used in the NCF.Before testing of the crane can proceed, thecrane test mechanic and the certifying officer mustbe present at the test site. The crane testmechanic and the crane test director will performand complete the BDA inspection during and afterthe testing of the crane. This document must besigned by the test mechanic and test director.One purpose of weight testing the crane isto check and make sure the hydraulic rams onthe outriggers support the crane and themaximum lifted load. A way to check thehydraulic rams is with a grease pencil and aruler. Measure from a known vertical pointon the hydraulic ram housing and place a linewith the grease pencil on the ram (fig. 3-17).Figure 3-16.—Crane radius.After each test, measure this knownmeasurement, and this will enable you to makesure there is no slippage in the hydraulic system.5.4 No-Load TestThe first part of the crane test procedure is theno-load test. The procedure is as follows:Figure 3-15.—Builder’s level leveling procedures.3-16
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