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 TM 55-1905-242-14
0006 00
Bilge Pump Circuit
General
The bilge pump circuit consists of the common components discussed above as well as a two flow dividers and two hydraulic
pumps, which drive the bilge pumps. The port circuit may only be powered by the port hydraulic pump and the starboard
circuit by the starboard hydraulic pump.
Flow Divider
A flow divider, mounted on top of each hydraulic pump, controls the flow of hydraulic oil to the bilge pumps. The flow divider
provides a flow of 10 gal/min (37.9 L/min) to the bilge pumps. The flow control valves also contain a relief valve, set at 1500
lb/in (103.4 bar), which protects the circuit from damage caused by overpressurization.
Hydraulic Pump
Two hydraulic pumps, one port and one starboard, power the bilge pumps. The bilge pumps receive hydraulic oil from the
hydraulic pumps via the flow divider and return their oil to the reservoir.
Crane Circuit
General
The crane circuit is powered from the ramp circuit of the starboard hydraulic pump. The crane circuit consists of the
common components listed above, as well as a relief valve, a crane diverter valve, a flow divider, a control valve block, and
the crane's operating cylinders (skew, lift, jib, and extension).
Relief Valve
The relief valve, mounted on bulkhead 39, aft of the starboard marine transmission, protects the circuit from damage caused
by overpressurization. The relief valve is set at 2500 lb/in (172.4 bar). When circuit pressure exceeds the relief valve
setting, the excess pressure is relieved and routed back to the reservoir.
Crane Diverter Valve
The crane diverter valve allows the operator to select between the ramp circuit and the crane circuit for the starboard
hydraulic pump. The valve is solenoid-actuated and controlled by a switch in the pilothouse console. When the solenoid
is energized, the crane diverter valve routes the hydraulic flow to the crane circuit. When the solenoid is deenergized, the
hydraulic flow is routed to the ramp circuit.
Flow Divider
The flow divider valve delivers a constant flow of 12 L/min (3.2 gal/min) to the crane circuit. All flow in excess of this rate
is returned to the reservoir. This constant flow rate provides the optimum flow for efficient crane operation. If the flow is
too slow, efficiency is lost. If the flow is too fast, equipment can be damaged.
Control Valve Block
The control valve block is a bank of four three-position, four-way valves that control all of the operations of the crane. One
valve is provided for each of the crane's four operating cylinders. The valves are infinitely positionable and spring-returned.
When a valve is in the neutral position, hydraulic oil passes straight through the valve without being directed to the appro-
priate operating cylinder. When the valve is shifted away from neutral, hydraulic oil flows to the appropriate operating
cylinder. Direction of valve shift determines the direction of operating cylinder motion. Because the valves are infinitely
positionable, cylinder speed increases as valve shift increases.
0006 00-10
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