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 TM 55-1905-220-14-1
1-81. CENTRALIZED HYDRAULIC SYSTEM.
a. A Centralized Hydraulic System (Figure FO-24) consists of a pump, controls, hydraulic cylinders, and a hydraulic
motor. These components raise and lower the following:
Main Mast
Stern Gate
Anchor "A" Frame
Refer to Figure 1-70 for a block diagram.
b. The Hydraulic Pump Unit is a centralized power source for the main mast, anchor A-frame winch, and stern gate.
The pump unit is a 3-phase, 3-horsepower, electric motor and pump.
c. The Main Mast Directional Control Valve is a manually operated valve which controls hydraulic fluid flow to the
main mast cylinder by depressing the lever.
d. The Main Mast Cylinder is an hydraulic cylinder used to raise and lower the main mast by depressing the lever.
e. The Anchor "A" Frame Directional Control Valve is a manually operated valve which controls hydraulic fluid flow
to the A-frame winch by depressing the lever.
f. The "A" Frame Hydraulic Winch and Winch Drum is used to swing out the Anchor "A" Frame for raising and
lowering the anchor. The winch drum holds the anchor cable.
g. The Stern Gate Directional Control Valve is a manually operated valve which controls the hydraulic fluid flow to
the two stern gate cylinders by depressing the lever. The one control valve is located on the starboard bulwark,
operating the two stern gate cylinders that raise and lower the stern gate.
h. The Inline Flow Control Valves act as hydraulic lines in the system.
1-119
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