TM 9-2350-256-34-2CHAPTER 3REPAIR INSTRUCTIONSSection I. REPAIR OF HOISTING BOOM ASSEMBLY3-1 DescriptionThe hoisting boom (fig. 1-13) is a tubular A-frame, and is pivot-mounted to the top front of the vehicle. Hydraulicpressure raises or lowers the boom by means of two boom-actuating cylinders which are activated by the boom controllever. The hoisting boom is capable of holding a 25-ton load. In operating position, the boom is supported by a staylinecable secured to crank arms located at the rear of the hull. These crank arms are connected to hydraulically actuatedstayline cylinders which govern the reaching capacity of the hoisting boom. A boom travel lock is provided for preventingmovement of the boom, particularly sideways, while traveling.3-2 Disassembly of Hoisting Boom Assembly into SubassembliesCAUTIONLOAD TEST REQUIREMENTa. Load testing of main winch, hoist winch and boom is mandatory, priorto use under any of the following conditions:(1) When new.(2) Following any repairs, disassembly and assembly, adjustmentsor parts replacement of hoist winch or boom.(3) When modifications are made that could affect the strength orlifting capabilities of the vehicle.b. Load testing will be accomplished by support maintenance activities.c. Refer to Chapter 2, Section V for detailed step-by-step procedures.a. General. Figure3-1 shows the subassemblies and attaching parts of the hoisting boom assembly.b. Disassembly Procedure. The peculiar nature of the hoisting boom assembly makes it necessary to disassemble itinto subassemblies during removal. For detailed instructions concerning removal and disassembly into subassemblies,refer to TM 9-2350-256-34-1.Change 43-1
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