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 TM 55-1905-242-14
0006 00
Starting Motor
Each propulsion engine has a hydraulic starting motor. The starting motor rotates the engine until the engine starts. The
starting motor is equipped with a retractable starter drive that extends to engage the flywheel when the starter is engaged,
and retracts from the flywheel when the starter is disengaged.
Blowdown Valve
A blowdown valve is mounted on top of the reservoir. This valve allows the pressure to be relieved from the accumulators
for service. When the blowdown valve is opened, the hydraulic pressure that is stored in the accumulators is allowed to vent
harmlessly to the reservoir.
Relief Valve
Two relief valves are installed in the hydraulic starting system. The valves are both mounted on top of the reservoir and
protect the system from damage caused by overpressurization. The relief valve setting is 3400 lb/in (234.4 bar). When
system pressure exceeds the relief valve setting, the excess pressure is vented harmlessly to the reservoir.
Isolation Valve
An isolation valve, located near the hand pump, isolates the two sides of the hydraulic starting system. When the isolation
valve is closed, the port and starboard hydraulic starting systems operate independently from one another. In this configu-
ration, the port engine-driven pump charges only the port accumulators, and the port accumulators power only the port
starter motor. The same is true for the starboard side of the system. When the isolation valve is open, both sides of the
hydraulic starting system work together. In this configuration, either engine-driven pump may charge either pair of accumu-
lators and either pair of accumulators may power the starter motor for either engine.
Hand Charging Pump Valve
The hand charging pump valve, located on top of the hand charging pump, isolates the hand charging pump from the
propulsion engine hydraulic starting system to protect it from damage. Under normal conditions, the valve is in the closed
position, isolating the hand pump from the system. The valve is open when the hand pump is in use.
Accumulator Valve
Each accumulator is equipped with a valve, allowing the accumulator to be isolated from the hydraulic starting system. When
the valve is closed, no hydraulic pressure is available from the accumulator to the system. When the valve is open, hydraulic
pressure is available.
Suction Valve
A single suction valve, located at the bottom of the reservoir secures the flow of hydraulic oil from the reservoir to the
hydraulic pumps. The valve is closed only for service. At all other times, it must remain open to prevent damage to the
pumps.
Gauge Valve
Each of the four accumulator gauges has a gauge valve to isolate the gauge from the system. The valve may be open or
closed, depending upon the operating condition. When the valve is open, the gauge reads accumulator pressure. When the
valve is closed, the gauge reads the pressure last seen before closing the valve.
Inline Filter
A high pressure, inline filter is mounted directly to each control valve. This filter removes contaminants from the hydraulic
oil before the oil enters the control valve and starting motor.
0006 00-3
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