B. Standard Tools and Equipment
 (1)  Caps (for the water lines at the fill/drain valve).
 C. Access
 (1)  Location Zone 128 Area Aft of Forward Cargo Container Compartment, Right
 D. Procedure
 S 844-002
 (1)  
Do this task: "Water System Servicing (Drain)" (AMM 12-14-61/301).

 S 864-003

 (2)  
Do this task: "Water System Depressurization" (AMM 38-15-60/201).

 S 034-004

 (3)
Disconnect the electrical connector from the fill/drain valve.

 S 034-005

 (4)  
Disconnect the valve fitting from the fill/drain valve.

 (5)  
Remove the clamshell coupling.

 (6)
Move the sleeve for the coupling away (down) from the adapter.

 S 034-008

 (7)  
Remove the screws and washers that hold the fill/drain valve to the bracket.

 (8)  
Remove the fill/drain valve.

 S 034-006
 S 034-007
 S 024-009
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A

747-400
MAINTENANCE MANUAL

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-010
 (9)  
Disconnect the adapter from the used fill/drain valve and connect it to the new fill/drain valve.

 S 864-011

 (10)
 If the new fill/drain valve is not installed immediately, put a cap in the open water lines.

 TASK 38-11-62-384-012
 3.  Fill/Drain Valve Installation (Fig. 401)_____________________________
 A. Consumable Materials
 (1)  D00463 Lubricant - White Protopet 1S (Witco Corp New York, NY 07804).
 B. References
 (1)  
AMM 12-14-61/301, Water System

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 38-15-60/201, Water System Pressurization

 C. Access
 (1)  Location Zone 128 Area Aft of Forward Cargo Container Compartment, Right
 D. Procedure
 S 864-013
 (1)  
If it is necessary, remove the caps from the water lines.

 S 424-014

 (2)  
Put the fill/drain valve in its installed position.

 S 434-015

 (3)  
Install the screws and washers.

 S 434-016

 (4)  
Install the clamshell coupling

 (a)  
Remove the old O-rings,

 (b)  
Make sure that all the parts of the coupling are clean,

 (c)  
Apply a thin layer of lubricant on the O-rings and on the inner surface of the sleeve,

 (d)  
Install the new O-rings.

 (e)  
Make sure the ends that connect at the clamshell coupling are not more than 0.24 inch apart.

 (f)  
Move the sleeve to the center of the coupling.

 (g)  
Install the clamp.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 434-019
 (5)  
Connect the valve fitting to the fill/drain valve. S 434-020

 (6)  
Connect the electrical connector to the fill/drain valve. S 864-021

 (9)  
During the fill procedure, do a check of the connections to the fill/drain valve for leaks.

 S 864-024

 (10)
　
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