(f)  
Wait ten minutes.

 (g)  
Do a check of the pressure again after the accumulator temperature becomes stable.

 (h)  
Tighten the swivel nut.

 (i)  
Remove the nitrogen source from the charging valve.

 (j)  
Install the dust cap on the charging valve (View B).

 S 863-011
 (10)
 Pressurize the right hydraulic systems as necessary to supply the parking brake pressure (AMM 29-11-00/201).

 S 863-012

 (11)
 Set the parking brake (AMM 32-44-00/001).

 S 863-005

 (12)
 Depressurize the hydraulic system if it is not necessary (AMM 29-11-00/201).

 S 793-016

 (13)
 Do a test of the parking brake system to make sure that there are no leaks (AMM 32-44-00/501).

 NOTE: It is not necessary to do a check for leaks if you did not
____
 need to service the accumulator.

 S 413-010
 (14)
 Close the hydraulic bay access door, 197KL (AMM 06-41-00/201).

 (15)
 Remove the chocks from the landing gear wheels.

 S 093-013
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 12-15-04
 ALL  ú ú 01 Page 305 ú Sep 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 HYDRAULIC MOTOR GENERATOR ACCUMULATOR - SERVICING
_________________________________________________
 1.  General_______
 A.  This procedure contains the data necessary to do the servicing of the 5kva hydraulic motor generator (HMG) accumulator.
 TASK 12-15-06-613-001-001
 2.  HMG Accumulator Servicing__________________________
 A.  References
 (1)  
29-11-00/201, Main Hydraulic Systems

 (2)  
32-00-15/201, Landing Gear Door Locks

 (3)  
32-00-20/201, Landing Gear Downlocks

 B.  Equipment
 (1)  
Pressurized Nitrogen Source (2000 psi)

 (2)  
Door Locks, Main Landing Gear

 C.  Access
 (1)  
Location Zones
 143/144 Main Landing Gear Body

 (2)  
Access Panels
 732/742 Main Landing Gear Body Doors

 D.  Prepare to do the HMG Accumulator Servicing.
 S 493-002-001
 (1)  Make sure the landing gear downlocks are installed
 (Ref 32-00-20/201).

 S 493-003-001
 WARNING:  USE THE PROCEDURE IN AMM 32-00-15 TO INSTALL THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Open the doors for the main landing gear, and install the door locks (Ref 32-00-15/201).

 S 863-004-001

 (3)  
Remove the pressure from the left hydraulic system
 (Ref 29-11-00/201).

 E.  Do the HMG Acumulator Servicing
 S 213-005-001
 (1)  Do a check of the pressure shown on the accumulator pressure gage.
 (a)  
If the accumulator pressure is within the limits specified on the servicing placard, no servicing is required.

 (b)  
If the pressure is not within the specified limits, service the accumulator.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH A CHARGING VALVE IN THE ú

 12-15-06
 MAIN LANDING GEAR WHEEL WELL.  ú CONFIG 1 ú 01 Page 301 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

A

LEFT WHEEL WELL
SEE A
HYDRAULIC LINE
UNION
SUPPORT CLAMP
ACCUMULATOR
SUPPORT CLAMP
PRESSURE GAGE
UNION ACCUMULATOR
HYDRAULIC PRESSURE
MOTOR GAGE
GENERATOR
CHARGING
VALVE

A
FWD
SERVICING PLACARD
SEE B
LEFT WHEEL WELL A
HYD. MOTOR GEN. ACCUMULATOR
CHARGE WITH DRY NITROGEN TO NOTED PRESSURE
2050
LIMITS
1950
DUST CAP
　
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