(b)  
Connect the electrical connector D7070 to the HMG control unit.

 (c)  
Close the P71 panel.

 S 864-007
 (2) Remove the DO-NOT-CLOSE tag, and close this P6 circuit breaker:
 (a)  6C3, HYD GEN CONT
 D. HMG Control Unit Installation Test
 S 864-008
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-009

 (2)  
Make sure the six EICAS circuit breakers on overhead circuit breaker panel P11 are closed.

 S 614-010

 (3)  
Pressurize the left hydraulic system (AMM 29-11-00/201).

 (a)  If you use the ACMPs to pressurize the left hydraulic system, do these steps: 1) Pressurize the left hydraulic system and the right
 hydraulic system with the ACMPs (AMM 29-11-00/201). 2) Put the PTU switch on the P61 panel to the ON position.
 S 714-011
 (4)  Do an operational check as follows:
 (a)  
Put the GND PROX/HYD GEN switch on the miscellaneous test panel P61, in the HYD/GEN position.

 (b)  
Push the ELEC/HYD switch on EICAS maintenance panel P61.

 (c)  
Make sure the EICAS ELEC/HYD display reads as follows: 1) HYD GEN DC-V 28 |4 2) HYD GEN AC-V 118 |5 3) HYD GEN FREQ 400 |5

 (d)  
Put the GND PROX/HYD GEN switch to the off position.

 (e)  
Make sure the EICAS ELEC/HYD display reads as follows: 1) HYD GEN DC-V 0 2) HYD GEN AC-V 0 3) HYD GEN FREQ 0

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú

 24-25-02
 ú ú 02 Page 404 ú Sep 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 (5)  S 864-012Remove hydraulic power if it is not necessary (AMM 29-11-00/201).
 (6)  S 864-013Remove electrical power (AMM 24-22-00/201) if it is not necessary.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú

 24-25-02
 ú ú 01 Page 405 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 HYDRAULIC MOTOR GENERATOR SHUTOFF VALVE REMOVAL/INSTALLATION
____________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the hydraulic motor generator (HMG) shutoff valve from the airplane. The second task installs the HMG shutoff valve on the airplane.
 TASK 24-25-03-024-001
 2.  Remove the HMG Shutoff Valve (Fig. 401)
____________________________
 A.  Equipment
 (1)  Main Gear Door Locks (Ref 32-00-15)
 B.  References
 (1)  
12-12-01/301, Hydraulic Systems

 (2)  
12-25-01/301, Exterior Cleaning

 (3)  
24-22-00/201, Electrical Power - Control

 (4)  
29-11-00/201, Main Hydraulic Systems

 (5)  
32-00-15/201, Main Gear Door Locks

 C.  Access
 (1)  
Location Zones
 143 Main Landing Gear Wheel Well
 211/212 Flight Compartment

 (2)  
Access Panels
 732 Main Landing Gear Body Door (LH Side)

 D.  Prepare for Removal
 S 014-002
 WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO INSTALL THE DOOR
_______ LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Open the doors for the left main gear and install the door locks (AMM 32-00-15/201).

 S 614-003

 (2)  
Remove the pressure from hydraulic systems and the left reservoir (AMM 29-11-00/201).

 S 864-004

 (3)  
Open this circuit breaker on the main power distribation P6 and attach DO-NOT-CLOSE tag:

 (a)  6C3, HYD GEN CONT
　
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