Chapter 12 Cranes and Attachments

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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