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Caution - 14076_151
Figure 8-3.Single-arm trackway gravity davit.

Engineman 2 - Intermediate engine mechanics training manual
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an air-driven hydraulic intensifier. Adjacent to the power unit  is  a  hydraulic  fluid  control  valve  panel.  An emergency  air-hydraulic  pump  is  also  provided  with  the system.   Fluid   pressure   is   transmitted   to   either   the undogging or dogging side of the hydraulic cylinders. You  must  read  the  specific  manufacturer’s  manual  or NAVSEA   0916-LP-018-2010,   Hydraulic   Operated Cargo Hatch Cover, to understand the full details of the system. Along with this, you should trace the system in your   ship   and   complete   the   required   PQS.   During repairs, follow the procedures specified by the PMS. BOAT DAVITS Gravity   davits   are   found   on   most   Navy   ships. Figures 8-1, 8-2, and 8-3 illustrate the types of gravity davits that you will be maintaining. For  general  information  about  boat  davits,  read Boatswain's Mate, Volume 1, NAVEDTRA 10101. You, as the maintenanceman, must also be familiar with the proper  operation  of  the  boat  davit.  Some  common problems with the boat davit are rusting of parts, loss of lubrication,  contaminated  oil  in  the  gearcase,  and  faulty centrifugal brakes. Because of the location of the boat davit  on  the  weather  deck,  the  machinery  is  highly exposed  to  sea  spray,  even  though  it  is  covered  by protective covering. You must lubricate the boat davit and   winch   after   adverse   weather   conditions.   For maintenance  and  repair  of  the  boat  davit,  follow  the PMS   assigned   for   this   machinery.   If   your   ship   is equipped with a double-pivoted link davit and a 50-hp winch,   NAVSHIPS   0920-072-1013   provides information  concerning  maintenance  instructions.  Your work  center  PMS  Manual  43P1,  under  Maintenance Index   Page   should   provide   you   with   the   correct reference publications for each piece of equipment. BOW RAMP AND DOOR MACHINERY The ramp and door system consists of the bow ramp, bow doors, tracks, winches with their wire rope rigging, fixed   and   positive   guidance   rollers,   vangs,   seating device, pivot post, control consoles, various interlock and limit switches, and the interlock control panels. In time, repairs will become necessary to correct the results of wear or to repair damage caused by various casualty conditions. You must know and use the correct sources   of   information   necessary   to   efficiently disassemble and reassemble the machinery. You must Figure  8-1.—Trackway  gravity  davit. 8-10







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