747-400
MAINTENANCE MANUAL

HYDRAULIC BRAKE ACCUMULATOR CHARGING EQUIPMENT INSTALLATION
SEE A
KEEL BEAM
MANIFOLD
MOUNTING
BRACKET

GAS
CHARGING
VALVE

CAP
TUBE CONNECTOR
REDUCER
O-RING
PRESSURE
TRANSMITTER WASHER (4 LOCATIONS)

SCREW (4 LOCATIONS)
HYDRAULIC BRAKE ACCUMULATOR CHARGING EQUIPMENT INSTALLATION
A
Brake Hydraulic Pressure TransmitterFigure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

 (2)  S 844-037Make sure the wheel chocks are installed.
 (3)  S 844-039If necessary, release the parking brake.
 S 494-030

 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 494-031

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

 S 864-051

 (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 684-007

 (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.

 (c)  
Make sure the pressure indication of the HYD BRAKE PRESS gage decreases during manual brake operation.

 (d)  
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 (Fig. 401).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 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.

 (c)  
Make sure the pressure indication of the direct reading pressure gage goes to zero.

 E.  
Procedure

 S 024-009
 (1)  
Do these steps to remove the pressure transmitter:

 (a)  
Loosen the nuts that connect the tube to the pressure transmitter and to the manifold.

 (b)  
Remove the tube.

 (c)  
Open this circuit breaker and attach DO-NOT-CLOSE tag:

 1)  P6, Main Power Distribution Panel a) 6D23, BRAKE PRESS IND

 (d)  
Open this circuit breaker (if installed) and attach a DO-NOT-CLOSE tag: 1) P415, Power Distribution Center, Right Panel

 a)  415R19, TOWING XFMR

 (e)  
Disconnect electrical connector DT409 from the pressure transmitter.

 (f)  
Remove four screws and washers that attach the pressure transmitter to the mounting bracket.

 (g)  
Remove the pressure transmitter.

 (h)  
　
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