(3)  
D00288 Lubricant - MCS 352

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

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 C.
D.
E.
A
747-400 MAINTENANCE MANUAL
 (4)  D00196 Hydraulic Fluid - BMS 3-11
 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____
 O-rings and fittings on the valve
 assembly.

References
 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 12-15-09/301, Hydraulic Brake Accumulator

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (5)  
AMM 32-00-30/201, Landing Gear Door Locks

 (6)
AIPC 32-41-11 Fig. 1Access

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

Procedure
 S 424-013
 (1)  
Do these steps to install the pressure gage:

 (a)  
Install the screws, washers, shield and spacers on the pressure gage.

 (b)  
Install the pressure gage on the mounting bracket with nuts.

 (c)  
Lubricate the threads on the pressure gage fitting.

 (d)  
Connect the tube to the pressure gage.

 (e)  
Tighten the tube nuts at the pressure gage and the manifold.

 S 614-014
 (2)  
Do 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)  
Turn the outer nut of the gas charging valve one turn
 counterclockwise.

 (c)  
With a value for the ambient temperature of the airplane, find the correct charge pressure for the accumulator.

 (d)  
Look at the pressure indication on the direct reading pressure gage adjacent to the mainfold assembly.

 (e)  
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.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

 (f)  Turn the outer nut of the gas charging valve clockwise until it
 is tight.
 (g)  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.
 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 864-025
 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.
　
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