an air-driven hydraulic intensifier. Adjacent to the powerunit is a hydraulic fluid control valve panel. Anemergency air-hydraulic pump is also provided with thesystem. Fluid pressure is transmitted to either theundogging or dogging side of the hydraulic cylinders.You must read the specific manufacturer’s manual orNAVSEA 0916-LP-018-2010, Hydraulic OperatedCargo Hatch Cover, to understand the full details of thesystem. Along with this, you should trace the system inyour ship and complete the required PQS. Duringrepairs, follow the procedures specified by the PMS.BOAT DAVITSGravity davits are found on most Navy ships.Figures 8-1, 8-2, and 8-3 illustrate the types of gravitydavits that you will be maintaining.For general information about boat davits, readBoatswain's Mate, Volume 1, NAVEDTRA 10101. You,as the maintenanceman, must also be familiar with theproper operation of the boat davit. Some commonproblems with the boat davit are rusting of parts, loss oflubrication, contaminated oil in the gearcase, and faultycentrifugal brakes. Because of the location of the boatdavit on the weather deck, the machinery is highlyexposed to sea spray, even though it is covered byprotective covering. You must lubricate the boat davitand winch after adverse weather conditions. Formaintenance and repair of the boat davit, follow thePMS assigned for this machinery. If your ship isequipped with a double-pivoted link davit and a 50-hpwinch, NAVSHIPS 0920-072-1013 providesinformation concerning maintenance instructions. Yourwork center PMS Manual 43P1, under MaintenanceIndex Page should provide you with the correctreference publications for each piece of equipment.BOW RAMP AND DOOR MACHINERYThe ramp and door system consists of the bow ramp,bow doors, tracks, winches with their wire rope rigging,fixed and positive guidance rollers, vangs, seatingdevice, pivot post, control consoles, various interlockand limit switches, and the interlock control panels.In time, repairs will become necessary to correct theresults of wear or to repair damage caused by variouscasualty conditions. You must know and use the correctsources of information necessary to efficientlydisassemble and reassemble the machinery. You mustFigure 8-1.—Trackway gravity davit.8-10
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