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 TM 55-1905-242-14
0006 00
Reservoir
A single reservoir stores the hydraulic oil necessary to operate the steering hydraulic system. The reservoir is large enough
to allow ambient air cooling of the hydraulic oil as it rests in the reservoir.
Pilothouse Gauge
A single gauge, mounted in the pilothouse console, monitors pressure in the hydraulic steering system.
BILGE/RAMP/CRANE HYDRAULIC SYSTEM
General
The bilge/ramp/crane hydraulic system powers the bilge pumps, the bow ramp winch and latches, and the crane. The bilge/
ramp/crane hydraulic system is made up of three separate hydraulic circuits that share certain common components. These
common components are the hydraulic pumps, the hydraulic diverter valves, the return filters, the suction strainers, the
pilothouse gauge, and the reservoir.
Common Components
Hydraulic Pump
Two hydraulic pumps power the bilge/ramp/crane hydraulic system. The hydraulic pumps are driven by Power Take-Off
(PTO) from the marine transmissions, port and starboard. The hydraulic pumps operate whenever the appropriate propulsion
engine is running and the PTO is engaged. All systems are capable of operation with only one hydraulic pump engaged,
although under certain conditions, operation of both hydraulic pumps will yield better system operation.
Diverter Valve
Each hydraulic pump discharges through a diverter valve. The diverter valve allows the operator to direct flow to the bow
ramp circuit or to the bilge pump circuit. Depending upon conditions, the operator may select both hydraulic pumps to the
bow ramp, both hydraulic pumps to the bilge pumps, or one hydraulic pump to each circuit. The crane is powered only by the
starboard hydraulic pump and only with the diverter valve in the RAMP position.
Return Filter
The return oil from all circuits flows back to the reservoir through duplex return filters. The filters remove particulate
contamination from the hydraulic oil before it enters the reservoir. The return filters are mounted directly above the hydrau-
lic reservoir and use disposable cartridge type elements.
Suction Strainer
Two suction strainers, one for each hydraulic pump, are mounted inside the reservoir. The suction strainers remove large
particulate contamination from the hydraulic oil before it enters the hydraulic pumps.
Reservoir
A partitioned reservoir is mounted on bulkhead 39, centerline, in the engine room. This reservoir serves both the
starting and the bilge/ramp/crane hydraulic systems. The bilge/ramp/crane portion of the reservoir has a capacity of
75 gallons (284 liters).
Bow Ramp Circuit
General
In addition to the common components above, the bow ramp circuit consists of a pilothouse gauge, a ramp control valve, a
counterbalance valve, a hand pump, a hydraulically-powered winch, and two ramp latch cylinders.
0006 00-7
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