TM 55-1930-209-14&P-133-9.2Bow crane. The bow crane moves the shore winch from its storage position forward of the bow crane base intoan LCM-8, or similar capacity vessel, for movement to the beach. This operation, with the exceptions noted below, isvery similar to moving the workboat to and from its cradle. This 20-ton capacity winch (dry weight 5.5 tons) is secured tothe forward weatherdeck on six steel pads with two steel bolts per pad. The bow crane hooks onto the shore winch with aspecial lifting sling and takes up slack. Remove the 12 bolts and the bow crane lifts the shore winch off its pedestals.Extend the crane boom to move the shore winch forward to a waiting LCM-8, or similar capacity vessel, which is layingacross the barge's bow. To provide sufficient maneuvering area for the LCM-8 to come in across the barge bow, unloadbefore deploying the two bow anchors. The LCM-8 runs aground on the beach and lowers its bow ramp. The shore unituses a rough terrain forklift to pick up the shore winch from the LCM-8 hold and position it ashore. To retrieve the shorewinch, reverse the procedures.Section III. Operating instructions3-10Operating controls. Bow crane operating controls are on the forward side of the deckhouse top. The hydraulicpower system controls are in void 1.3-10.1Primary crane operating controls are five control levers for controlling crane movement (Figure 3-2 for Barge 1and Figure 3-3 for Barges 2 and 3). This control valve system is factory sealed and is especially designed for use in amarine environment. It has a built-in pressure relief valve, which prevents damage to the crane from overloading; asuction valve, which ensures a continuous flow of hydraulic fluid; and a constant flow valve, which regulates andmaintains the required system hydraulic pressure.There is a START/STOP control station (Figure 3-6) for stopping and starting the crane hydraulic unit and an anti-2-block control panel in a watertight storage box aft of the control levers. Another START/STOP control station, primarilyfor emergency use, is on the weatherdeck forward bulkhead.3-10.2The hydraulic power unit in void 1 portside, powered by a 30 Hp motor, produces 3600 psi of hydraulic pressurefor operating the crane. A motor controller (Figure 3-4) in void 1 starts and stops the hydraulic power unit locally andsupplies power to the two remote START/STOP control switches. The pump motor controller requires 440 Vac, 3 phase,60 cycle power.3-11Bow crane prestart proceduresa.Check barge maintenance log on bow crane and associated hydraulic system. Make sure there are nodiscrepancies that would prohibit bow crane operation.b.Make sure switchboard circuit breaker P16 is closed (ON).CAUTIONDue to high pressure in hydraulic system, do NOT operate crane with any visible leaks.Repair crane prior to use. Correct leaks in flexible hose, hardpiping, or joints. Do notconfuse seepage around hydraulic packing on actuator arms with leaks. A small amountof seepage is acceptable.c.In void 1, visually inspect hydraulic pump and motor and hard piping of crane hydraulic system for leaks ordamage. Do not use system until such leaks have been repaired.d.Remove filler cap on hydraulic tank and make sure fluid level is within 1 inch of bottom of filler neck. If fluid isbelow this level, add hydraulic fluid before using crane. Screw cap on tightly before starting hydraulic pump.e.In void 1, push up on main switch on hydraulic power unit motor controller (aft bulkhead) and setHAND/OFF/AUTO switch to HAND position (Figure 3-4).NOTEHydraulic power unit pump is started locally by pushing green START button on motorcontroller or pushing blank START button on START/STOP control station on deckhousetop. If bow crane has not been used recently, start pump by pressing green motorcontroller START button and make sure pump starts.3-9
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