(b)  
11R29, AC BUS SENSE RIGHT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú

 24-25-03
 ú ú 01 Page 401 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

LEFT WHEEL WELL SEE A
HYDRAULIC MOTOR
GENERATOR SHUTOFF
VALVE

SEE B
MOUNTING BOLTS
(3 LOCATIONS)

MANUAL OVERRIDE FWDARM POSITION INDICATOR HMG RUNNING
LEFT WHEEL WELL
POSITION A
VALVE ACTUATORV10128 MOTOR
CONTROL VALVE
HYDRAULIC

MOTOR/GENERATOR ELECTRICAL CONNECTOR
HMG NOT RUNNINGPLACARD POSITION
HYDRAULIC MOTOR GENERATOR
SHUTOFF VALVE

B
Hydraulic Motor Generator Shutoff Valve Installation Figure 401
A07490
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú

 24-25-03
 ú ú 01 Page 402 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 E. Procedure
 S 024-006
 (1)  Remove the HMG shutoff valve as follows:
 (a)  
Remove the electrical connector D7074 from the HMG shutoff valve.

 (b)  
Disconnect the three hydraulic lines from the HMG shutoff valve and install caps and plugs.

 (c)  
Remove the three mounting bolts and washers.

 (d)  
Remove the HMG shutoff valve.

 S 164-007
 CAUTION:  HYDRAULIC FLUID SPILLAGE SHOULD BE PROMPTLY CLEANED AND
_______ REMOVED. HYDRAULIC FLUID CAN DAMAGE AIRPLANE EQUIPMENT.
 (2)  
Clean any hydraulic fluid from the installation area (Ref 12-25-01).

 S 034-008

 (3)  
Remove the three unions from the HMG shutoff valve. Keep the unions for installation. Discard the O-rings.

 TASK 24-25-03-424-009
 3. Install 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)  
24-22-00/201, Electrical Power - Control

 (3)  
29-11-00/201, Main Hydraulic Systems

 (4)  
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 Installation
 S 644-010
 (1)  
Install new O-rings on the unions.

 (a)  Apply hydraulic lubricant or hydraulic fluid to O-rings and union threads.

 (2)  
Install the unions in the HMG shutoff valve ports.

 S 434-011
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú

 24-25-03
 ú ú 02 Page 403 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 E. Procedure
 S 424-012
 (1)  Install the HMG shutoff valve as follows:
 (a)  
Install the HMG shutoff valve on the wheel well bulkhead with three bolts and washers.

 (b)  
Connect the three hydraulic lines to the HMG shutoff valve.

 (c)  
Connect the electrical connector D7074 to the HMG shutoff valve.

 S 864-013
 (2)  Remove the DO-NOT-CLOSE tag, and close this P6 panel circuit breaker:
 (a)  6C3, HYD GEN CONT
 S 864-014
　
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