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 C. Engine-Driven Pump 1030GK
R  (Ref. Fig. 016, 017) The engine-driven pump (EDP) is attached to the accessory gearbox on the bottom of the engine. A splined quill drive connects the gearbox to the input shaft of the pump. The quill drive is made to shear if the pump can not turn. The attachment flange of the pump has keyhole slots where the installation bolts are. The suction line connection has a quick-release self-sealing coupling. Together, they make it possible to replace the pump quickly.
 The pump is of the variable-displacement type. The rotating assembly turns all of the time that the engine operates. The pump has nine pistons which are connected to a moveable yoke plate. When the angle of the yoke plate changes, the stroke of the pistons changes and the output of the pump is increased or decreased. The compensator valve supplies servo pressure to the actuator piston, which controls the angle of the yoke. A solenoid valve (controlled from the flight compartment) makes it possible to change the operation of the pump so that it does not supply pressure to the system (depressurized mode). The EDP includes a blocking valve which isolates the pump from the hydraulic system when the pump operates in the depressurized mode.
 In the depressurized mode the outlet of the pump is connected internally directly to the inlet of the pump. The pump then operates with an internal pressure of approximately 1000 psi (70 bar), with zero flow. This is the pressure necessary on the actuator piston to reduce the angle of the yoke to near zero when the outlet and control pressures are balanced. A case pressure relief valve connects the fluid in the EDP case to the inlet of the pump if the pressure of the fluid in the case is too high (for example if the case drain pipe is blocked). A pump inlet boost impeller is included in the EDP which increases the pressure of the fluid at the inlet of the pump. This makes certain that the chambers of the pump get a sufficient supply of fluid at all conditions of operation.
 Seal drain fluid goes through a pipe into a collector tank which holds the fluid. The hydraulic fluid is kept apart from drain fluids from other components. The collector tank has a manual drain valve so that you can empty it on the ground. It also allows you to measure the amount of leakage from the EDP. During flight excess fluid goes overboard through the power plant drains system (Ref. 71-70-00).

R  Engine-Driven Pump (VICKERS) Figure 016
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R  Engine-Driven Pump (VICKERS) - Schematic Figure 017
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 The EDP supplies fluid at 206 + 3 -0 bar (3000 +43 -0 psi) at zero flow and 196 bar (2854 psi) with a flow of 140 l/min (37 USgal/min). The EDP gives this flow at its rated delivery speed of 3702 rpm (equivalent to 100% engine N2 speed).
 If the supply of fluid to the EDP stops (the fire valve is closed) the EDP can operate for a maximum of 15 mins. before it is damaged.
 D. Manifolds
 There are three manifolds in the system, they are:
 -
the HP manifold,

 -
the PTU manifold,

 -
the LP manifold.

 All of the manifolds are aluminum alloy castings. They are machined to make it possible to install different components on them. Some of the hydraulic connections between the manifolds and components are of the bobbin type (Ref. 29-00-00). Thus, replacement of components is possible with minimum effect on other components or pipes. The manifolds are drilled to make the internal connections between components.
 The following are the components installed on their related manifolds:
 **ON A/C 001-049, 051-058, 101-101,
 (1)
 HP Manifold

 -
the solenoid valve 1150GP (Ref. 29-19-00),

 -
the pressure relief valve 1063GM,

 -
the HP filter 1048GM,

 -
the check valves 1022GM and 1059GM,

 -
the sampling valve 1187GM,

 -
the pressure transmitter 1065GN (Ref. 29-32-00),

 -
the pressure switch 1151GN (Ref. 29-32-00),

 -
the pressure switch 10-CE-2 (Ref. 27-00-00).

 

 (2)
 PTU Manifold

 -
the priority valve 1064GM,

 -
the check valves 1093GM and 1094GM,

 -
the solenoid valve 1012GL (Ref. 29-23-00),

 -
the solenoid valve (Ref. 32-00-00).

 

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R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
 (1)
 HP Manifold

 -
the pressure relief valve 1063GM,

 -
the HP filter 1048GM,
　
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