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 TM 55-1905-222-14
1-19
RAMP HYDRAULIC SYSTEM.
a.
The function of the ramp hydraulic system. is to lower and raise the ramp as required. The ramp hydraulic
pump Is driven by the marine transmission top- mounted power take-off. When the hydraulic diverter valve is set for
ramp operation, the pump discharges hydraulic oil through the check valve to the ramp control valve.
b.
The ramp control valve is actuated by raising or lowering the ramp control lever located in the pilothouse.
When. the ramp control lever Is raised, the control valve pipes the flow through line (1) to the hydraulic motor inside the
winch. A cable and sheave mechanism raises the ramp as the wire rope winds onto the winch drum Return oil flows
through line (2) through the return filters into the ramp hydraulic reservoir. When It is desired to lower the ramp, the
ramp control lever is lowered The control valve pipes the flow through line (3) to the winch motor, returning to the
reservoir through line (2)
1-26
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