(10)
Fill the hydraulic reservoirs (AMM 12-12-01/301). S 416-021
(11)
For the center hydraulic system, close the access panel, 197KL, for the central hydraulic service center (AMM 06-41-00/201).
S 096-022 WARNING: USE THE PROCEDURE IN AMM 32-00-15 TO REMOVE THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(12) For the left or right hydraulic system, remove the door locks from the landing gear doors and close the doors (AMM 32-00-15/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
MAIN (LEFT, RIGHT, AND CENTER) HYDRAULIC SYSTEMS -
________________________________________________ DESCRIPTION AND OPERATION
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General
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A. The main hydraulic systems consist of the left, right, and center systems. These systems provide fluid under pressure of 3000 psi to portions of the flight control, auto flight, landing gear, and thrust reverser systems. The components of the main hydraulic systems are shown in figures 1 and 2.
B. The pressure sources for the left and right systems are one engine driven pump (EDP) and one alternating current motor pump (ACMP) installed in parallel. The EDP runs all the time that the engine is running. When the ELEC pump switch is ON, the ACMP runs all the time.
C. The pressure sources for the center system are two ACMP's installed in parallel. When the ELEC pump select switches are ON, the ACMP's run all the time.
Engine Driven Pump (EDP) (Fig. 3)
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A. The engine driven pumps (EDP) are one of the pressure sources for the left and right systems. The EDP is driven by the engine gearbox and is located on the right side of the engine. Each EDP supplies 37 gpm at 3700 rpm and 2850 psi. A valve in the pump varies the amount of fluid delivered to hold system pressure constant until system demand exceeds rated flow of pump. When system pressure reaches 3100 psi the EDP delivery flow is zero for all pump speeds.
B. The EDP moves fluid through the pump case to lubricate and cool the pump. This fluid flows out the case drain port to the system heat exchanger and returns to the reservoir.
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