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 TM 55-1905-220-14-1
1-89. HYDRAULIC STARTING SYSTEM - DIESEL GENERATOR AND PROPULSION ENGINE.
a. Each of the Forward and Aft Engine Rooms (Figures FO-30 and FO-31) contains one Hydraulic Starting System
for the main propulsion engine and diesel generator located in that room. The Hydraulic Starting System is used for
cranking internal combustion engines. The system is automatically recharged after each engine start. It can also be
manually recharged in an emergency. The ability to start does not decrease after sitting for a long time. Hot or cold
climates do not have any harmful effects upon the Hydraulic Starting System.
b. The Hydraulic Starting System (Figure I-72-) consists of a reservoir, an engine-driven charging pump mounted
on the propulsion engine and diesel generator, and a hand pump with pressure gage. It also consists of two piston-type
accumulators with pressure gages, a starting motor, high and low pressure filters, connecting hoses and fittings, and
solenoid valves with manual overrides.
c. Hydraulic fluid flows by gravity or slight vacuum from the reservoir to the engine-driven pump inlet or the hand
pump inlet. The hand pump supplies the initial charge and recharges the system. The fluid is discharged from the pump
outlet at a high pressure and flows into the accumulator. There it is stored at 3250 psi (228497.8 gm sq cm) under the
pressure of compressed nitrogen gas. When the starter is engaged and the control valve is opened, the expanding
nitrogen gas forces the fluid out of the accumulator at a high pressure. It then flows into the starting motor which quickly
speeds up the engine to a high cranking speed. The fluid returns from the starter to the reservoir.
d. The Charging Pump runs all during engine operation, recharging the accumulator with fluid. A pressure operated
unloading valve in the pump opens and returns the pump discharge to the reservoir when the proper amount of fluid has
been returned to the accumulator.
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