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TM 55-1905-219-14-1
HYDRAULIC STARTING SYSTEM-DIESEL GENERATOR AND PROPULSION ENGINE.
a. Each of the Forward and Aft Engine Rooms (Figures FO-29 and FO-30) 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 a long time. Hot or cold climates
do not have any harmful effects upon the hydraulic starting system.
b. The Hydraulic Starting System (Figure 1-70)  consists of a reservoir, an engine-driven charging pump
mounted on the Propulsion Engine and Diesel Generator and a hand pump with pressure gauge. It also consists of two
piston-type accumulators with pressure gauges, a starting motor, high and low pressure filters, and connecting hoses and
fittings.
c.  Hydraulic fluid flows by gravity or slight vacuum from the reservoir to engine-driven pump inlet or the hand
pump inlet. The hand pump is to supply the initial charge or to recharge 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.
e. The reservoir is a steel tank with a fine mesh screen at the outlet. The filler cap contains a filter to stop dust
and dirt from entering the reservoir.
f.  The engine-driven charging pump is a single piston, positive displacement type.  It should run at
approximately engine speed. The pump contains ball check valves and an unloading valve operated by the accumulator
pressure. The operation is completely automatic and operates in either direction of rotation.
g. The hand pump is a single piston, double-acting, positive displacement type. Flow through the pump is
controlled by ball check valves. A manually operated relief valve is provided so the accumulator pressure may be relieved
when any servicing is required.
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