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Roller Safety
Figure  12-4.-Crane  radius  measurement.

Equipment Operator Basic - Beginning construction equipment operators manual
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CRANES CHAPTER 12 AND ATTACHMENTS Cranes and attachments are essential to the support of  Naval  Construction  Force  (NCF)  operations.  Lifting heavy  objects,  loading  and  unloading  construction materials,  excavating  earthwork  materials,  and  driving and extracting piles are typical tasks accomplished by the use of cranes and attachments. Cranes and attachments procedures are a complex set  of  characteristics.  Proper  and  efficient  operation  of cranes  and  their  attachments  requires  more  knowledge and  skill  than  for  any  other  piece  of  construction equipment you will operate. NOTE: You must always be exceptionally safety conscious when working on or around crane operations of any type. This chapter covers the characteristics and basic principles of operations of cranes and attachments. By reading  the  operator’s  manual  and  attending  crane  school, you  can  obtain  detailed  information  about  crane operations. CRANES Cranes are classified as  weight-handling equip- ment   and  are  designed  primarily  to  perform weight-lifting  and  excavating  operations  under  varied conditions.  To  make  the  most  efficient  use  of  a  crane, you  must  know  their  capabilities  and  limitations. TYPES OF CRANES Cranes have evolved from many designs to satisfy the needs of construction and industrial operations. Operational characteristics of all cranes are basically the same. Although the superstructure is about the same on all makes and models of mobile cranes, the carrier, or mounting, may be one of three types: crawler, truck, or wheel  (fig.  12-1). Crawler-Mounted Cranes The crawler-mounted crane is categorized under the 42-00000  USN  number  registration  series.  The crawler-mounted  crane  is  slower  and  less  mobile  than the  truck-mounted  crane;  however,  the  crawler-mount crane  provides  a  stable  base  for  operation  of  the revolving  superstructure. The travel unit of the crawler crane is shown in figure   12-2. The  travel  unit  includes  the  base, travel   gears,   clutches,   travel   brakes,   sprockets, rollers,   crawler   chains,   and   crawler   treads.   The revolving  superstructure  rotates  on  the  turntable (fig.  12-3). Figure  12-1.-Crane  carrier  mountings. Figure  12-2.—Crawler  crane  travel  unit. Figure  12-3.—Turntable  assembly. 12-1







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