(3)  
D00288 Lubricant - MCS 352

 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____
 O-rings and fittings.

 (4)  D00196 Hydraulic Fluid - BMS 3-11
 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____
 O-rings and fittings.

 C. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
AIPC 32-41-11 Fig. 1

 D.
Access

 (1)  
Location Zone
 138 Body Landing Gear Well - Right

 E.
Procedure

 (1)  
Lubricate a new O-ring.

 S 434-035
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A 747-400 MAINTENANCE MANUAL
 (2)  S 434-036Install the O-ring on the gas charging valve.
 (3)  S 434-037Lubricate the threads of the gas charging valve.
 (4)  S 424-038Do the steps that follow to install the gas charging valve: (a) Install the gas charging valve on the manifold. (b) Lockwire the body of the gas charging valve to the manifold.
 (5)  S 614-043Do these steps to charge the hydraulic brake accumulator: (a) Attach a source of nitrogen or dry air to 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) (c) (d) (e)  Turn the outer nut of the gas charging valve one turn counterclockwise.With a value for the ambient temperature of the airplane, find the correct charge pressure for the accumulator.Look at the pressure indication on the direct reading pressure gage adjacent to the mainfold assembly.Pressurize the accumulator to the correct pressure shown on the charging instructions marker.
 NOTE:____ Use the direct reading pressure gage for indication of the accumulator charge pressure.
 (f) (g)  Turn the outer nut of the gas charging valve clockwise until it is tight.Do these steps to make sure that the accumulator charge pressure is satisfactory: 1) Look at the pressure indication of the HYD BRAKE PRESS gage, on the P1 panel. 2) Slowly push one set of brake pedals to the limit of travel. 3) Make sure the indication of the HYD BRAKE PRESS gage does not decrease when you push the brake pedals down.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 4)  If the indication of the HYD BRAKE PRESS gage decreases during brake operation, do the accumulator charging procedure again.
 NOTE: Sometimes you must do the accumulator charging
____ procedure a second time. This is necessary when the initial accumulator charging was done without the accumulator completely empty of hydraulic fluid.
 (h)  
Disconnect the nitorgen or dry air source from the stem of the gas charging valve.

 (i)  
Install the cap on the stem of the gas charging valve.

 S 864-027
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (6)  
Pressurize hydraulic system 4 (AMM 29-11-00/201).

 S 864-039

 (7)  
Set the parking brake.

 S 784-017

 (8)  
Make sure the pressure indication on the direct reading pressure gage is 3000 |200 psi.

 S 784-040

 (9)  
Remove the power from hydraulic system 4 (AMM 29-11-00/201).
　
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