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 TM 55-1905-219-14-1
CENTRALIZED HYDRAULIC SYSTEM.
a. A Centralized Hydraulic System (Figure FO-28) consists of a pump, controls, hydraulic cylinders, and an
hydraulic motor. These components raise and lower the following:
Main Mast
Stern Gate
Anchor "A" Frame
Refer to Figure 1-68 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.
(1) The main mast directional control valve is a manually operated valve which controls the hydraulic fluid
flow to the main mast cylinder by depressing the valve lever.
(2) The main mast cylinder is an hydraulic cylinder used to raise and lower the main mast by depressing the
valve lever.
(3) The Anchor "A" Frame directional control valve is a manually operated valve which controls the hydraulic
fluid flow to the "A" Frame winch by depressing the lever.
(4) The "A" Frame hydraulic winch and winch drum are used to swing out the anchor "A" Frame for raising
and lowering the anchor. The winch drum holds the anchor cable.
(5) 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. There is one control valve located on the Starboard bulwark.
(6) The Inline Flow control valves are hydraulic lines coming from the control valve lines directly to the Stern
Gate cylinders.
(7) The Stern Gate cylinders are hydraulic cylinders used to raise and lower the Stern Gate.
1-115
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