B.
Consumable Materials

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

 (2)  
If nitrogen is not available,
 Source of Clean Dry Air, maximum moisture
 content corresponding to an atmospheric dew
 point of -20 degrees F (-29 degrees C)

 C.
Consumable Materials

 (1)  
D00288 Lubricant - MCS 352

 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____ O-rings and fittings on the accumulator assembly.
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747-400 MAINTENANCE MANUAL
 (2) D00196 Hydraulic Fluid - BMS 3-11
 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____
 O-rings and fittings on the accumulator
 assembly.

 D. References
 (1)
AMM 12-12-01/301, Hydraulic Systems (Hydraulic Replenishing)

 (2)
AMM 24-22-00/201, Manual Control

 (3)
AMM 09-11-00/201, Main Hydraulic Supply System

 (4)
AMM 32-00-30/201, Landing Gear Door Locks

 (5)
IPC 32-41-09 Fig. 1

 E.
Access

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

 F.
Procedure

 S 434-042
 (1)
Lubricate new O-rings and the union.

 S 434-043

 (2)
Install an O-ring on the union.

 S 434-044

 (3)
Install the union on the higher end of the accumulator.

 (4)
Install an O-ring on the union.

 (5)
Install the union on the lower end (gas port) of the accumulator.

 (6)
Put a cap on the end of the lower union.

 (7)
Fill the accumulator with hydraulic fluid.

 S 434-045
 S 434-046
 S 434-047
 S 434-048
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747-400 MAINTENANCE MANUAL
 S 434-049
 (8)  Look for damage at the accumulator clamps.
 NOTE: Damage will usually occur in the area around the clamp leg.
____
 (a)  Replace a clamp if it has cracks or is broken.
 S 424-013
 (9)  
Do these steps to install the hydraulic brake accumulator:

 (a)  
Put the accumulator in its position in the clamps.

 (b)  
Align the tubing with the unions on the accumulator.

 (c)  
Tighten the clamps.

 (d)  
Remove the cap from the lower union.

 (e)  
Connect the tubing to the lower end of the accumulator.

 (f)  
Connect the hydraulic line to the higher end of the
 accumulator.

 S 614-053
 (10)
 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)  
Look at the charging instructions marker adjacent to the accumulator.

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

 (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.

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