747-400
MAINTENANCE MANUAL

TUBING TO THE 
HYDRAULIC BRAKE 
ACCUMULATOR 
DIRECT READING 
PRESSURE GAGE  GAS 
HYDRAULIC BRAKE  CHARGING 
ACCUMULATOR CHARGING  VALVE 
EQUIPMENT INSTALLATION 
SEE  A 

HYDRAULIC BRAKE ACCUMULATOR 
CHARGING EQUIPMENT INSTALLATION 
A 
O-RING  GAS 
CHARGING 
VALVE 
MANIFOLD 
CAP 

MANIFOLD ASSEMBLYB
Hydraulic Brake Accumulator Gas Charging Valve Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

 S 494-023

 WARNING:_______ YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
 THE DOOR LOCKS ON THE LANDING GEAR DOORS.  THE DOORS CAN CLOSE
 QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY.  THIS

 CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 494-024

 (5)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 S 844-031

 (6)  
Supply electrical power (AMM 24-22-00/201).

 S 864-006

 (7)  
Remove the pressure from hydraulic system 4 (AMM 29-11-00/201).

 S 864-007

 (8)  
Do these steps to remove the hydraulic fluid from the hydraulic brake accumulator:

 (a)  
Look at the pressure indication of the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1.

 (b)  
Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Repeat this cycle 10 times. 1) Make sure the pressure indication of the HYD BRAKE PRESS

 gage decreases during manual brake operation.
 2)  After the 10 cycles of manual brake operation, make sure the HYD BRAKE PRESS gage shows no more decrease in pressure.
 S 844-008
 (9)  
Do these steps to release the gas from the hydraulic brake accumulator:

 (a)  
Remove the cap from the stem of the gas charging valve.

 WARNING:_______DO NOT LOOSEN THE BODY OF THE GAS CHARGING VALVE. THE PRESSURE IN THE ACCUMULATOR CAN QUICKLY PUSH THE GAS CHARGING VALVE OFF THE MANIFOLD. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.

 (b)  
Turn the outer nut of the charging valve one turn counterclockwise to release the gas from the hydraulic brake accumulator.

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747-400 MAINTENANCE MANUAL
 (c)  
Make sure the pressure indication of the direct reading pressure gage goes to zero.

 E.
Procedure

 S 034-032
 (1)  
Remove the lockwire from the gas charging valve.

 S 024-033

 (2)  
Turn the body of the gas charging valve counterclockwise to remove the gas charging valve from the manifold.

 S 034-034

 (3)  
Remove and discard the O-ring.

 TASK 32-41-10-404-010
 3. Hydraulic Brake Accumulator Gas Charging Valve Installation (Fig. 401)
___________________________________________________________
 A. General
 (1)  
In subsequent steps, the hydraulic brake accumulator gas charging valve is referred to as the gas charging valve.

 B.
Consumable Materials

 (1)  
G01158 Nitrogen, Gaseous (Dry, Commercial
 Grade, 99.9 percent pure)

 (2)  
If nitrogen is not available,
　
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