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 C.  The output of the EDP can be shut off by a depressurization valve on the pump. This valve closes the pump outlet port when the engine pump switch on the hydraulic control panel is moved to DEPRESS. The valve also closes when the engine fire switch on the aft electronic control panel P8 is pulled out to FIRE position.
Alternating Current Motor Pump (ACMP) (Fig. 4)
_____________________________________
 A.  The left and right systems each have one ACMP and the center system has two ACMPs. The left and right system ACMP's are in the left and right main wheel well forward fairings, respectively. The two center system ACMP's are in the aft left wing/body fairing. Each pump is attached to vibration absorbing mounts.
 B.  The ACMP supplies 12 gpm at 1000 psi. At pressure above 1000 psi the pump output decreases to 6.7 gpm at 2850 psi. When pressure reaches 3025 psi the pump delivery flow is zero.
 C.  The pump is driven by a 115/200-volt 3-phase 400 Hz motor. The motor is controlled by the ELEC pump switches on the hydraulic control panel. The right system ACMP will also operate when the RESERVE BRAKE switch on main instrument panel P1 is on. The ACMP 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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

SEE A
RESERVOIR ACMP PRESSURE/CASE DRAIN FILTER MODULE
ALTERNATING CURRENT MOTOR PUMP (ACMP), C2RETURN (INBOARD)FILTER MODULE ACMP, C1 (OUTBOARD)
GROUND SERVICING STATION
GROUND POWER RETURN CONNECTION
GROUND POWER
PRESSURE CONNECTION

FWD
A
C System - Component Location Figure 1
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 ALL  ú ú 01 Page 2 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

RIGHT MAIN
WHEEL WELL

SEE  E 
ENGINE STRUT 
LEFT MAIN  SEE  C 
WHEEL WELL 
SEE  D  ENGINE 
SEE  A 
ENGINE-DRIVEN 
PUMP (EDP) 
ENGINE STRUT 
　
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