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Linear retraction engine accumula
Retraction Engine Manifold - 14001_177

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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The C-13 linear retraction system also incorporates a central charging and gauge panel (fig. 4-48). It contains the pump controls, pressure gauges for the various engine components, a retraction engine suspend switch, and an air charging/blowdown manifold with the associated valves and piping. ROTARY RETRACTION ENGINE The rotary retraction engine (fig. 4-49) consists of a hydraulic motor, which transfers its motion by means of a drum assembly to the cable drive system, Advance of the grab is accomplished by admitting pressurized fluid to the hydraulic motor. This causes the motor and drum to rotate, winding the grab advance cables onto the drum while paying out the grab retract cables. The rotation of the cable drum is stopped by fluid braking of the hydraulic motor. Retraction is accomplished by admitting pressurized fluid to the hydraulic motor so that the flow of fluid is opposite of what it was during advance. This reverses the rotation of the motor and the drum, causing the retract cables to be wound onto the drum while the advance cables are payed out off of the drum. The retract motion is also stopped by fluid braking of the hydraulic motor. Electrical limit switches and hydraulic valves mounted on the upper engine framework are actuated by cams on the top of the traverse carriage assembly, and control the operation of the engine. The hydraulic motor (fig. 4-49) is rotated by pressurized fluid from the main hydraulic accumulator. Speed and direction of rotation are controlled by various directional valves located on the retraction engine. The hydraulic motor is coupled directly to the drum assembly, causing the drum to rotate in the same direction and speed as the motor. Figure 4-48.—Central charging panel (C-13). 4-38







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