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 TM 55-1905-221-14-1
b. Energy required for hydraulic cranking is supplied by fluid stored under approximately 3000 psi pressure in two
interconnected accumulators are charged first by a hand operated hydraulic pump and then by engine driven
pumps. They will not be overcharged during long periods of engine , operation because of pressure control built
into the pumps. There is also a system relief valve set at 3400 psi, which is the safe maximum pressure for this
system.
1-18. TRANSMISSION.
a. The torquematic marine reverse gear and the flywheel assembly provide an emergency forward clutch lock and
positive clutch engagement or release by simply moving the selector valve lever to the desired position for
forward, neutral, or reverse.
b. Each marine gear consists of a flywheel and forward drive clutch assembly and a reverse drive clutch assembly
with a through drive shaft. Also, each has an oil pump for supplying oil under pressure for operating the forward
and reverse clutches, a control valve to admit oil to the clutches, an oil strainer, a full-flow oil filter, and an oil
cooler.
c. Power from the diesel engine is imparted to the through drive shaft by locking the forward or reverse clutch plate
between the hydraulically operated piston and a drive plate.
1-19. HYDRAULIC STEERING SYSTEM.
a. See figure 1-9 for diagram of steering system.
b. The hydraulic steering systems use medium pressure hydraulic fluid to actuate cylinders which position the
rudders. Fluid is supplied by the hydraulic pumps to the helm unit which is the principal metering and directional
controlling device. By directing hydraulic fluid to one side or the other of the cylinders they will extend or retract
giving the desired position to the rudders.
c. The helm unit and other valves control the direction and volume of flow of hydraulic fluid. The relief valve
protects the system by limiting hydraulic fluid pressure. The flow control valve (flow divider) limits the volume of
fluid to the value at which this system is designed to work. The flow control valve (flow divider) divides the fluid
supplied into two flows (2.5 gpm) to the helm unit, and the remainder returned to the storage tank.
1-47
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