S 034-007

 (6)
Move the sleeves for the coupling away from the overflow valve.

 S 034-008

 (7)  
Remove the four screws and washers that hold the overflow valve on the bracket.

 S 024-009

 (8)  
Remove the overflow valve.

 S 864-010

 (9)  
Put caps on the three open lines.

 TASK 38-11-63-384-011
 3.  Overflow/Depressurization Valve Installation____________________________________________
 A. General
 (1)  The overflow/depressurization valve is referred to at the overflow valve in this procedure.
 B. References
 (1)  
AMM 12-14-61/301, Water System Servicing

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

 (3)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceilings and Sidewall Linings

 (4)  
AMM 36-00-00/201, Pneumatic System

 (5)  
AMM 38-15-60/201, Water System Pressurization

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A
747-400
MAINTENANCE MANUAL

 C. Consumable Materials
 (1)  D00463 Lubricant - White Protopet 1S (WITCO Corp, New York, NY 07804)
 D. Access
 (1)  Location Zone 124 Forward Cargo Container Compartment Aft Half, Right
 E. Procedure
 S 434-012
 (1)  
Remove the caps from the three open lines.

 S 034-013

 (2)  
Remove the old O-rings at each of the clamshell coupling locations.

 S 144-028

 (3)  
Make sure the sleeve and the ends that connect are clean.

 S 394-014

 (4)  
Lubricate the new O-rings and the inner surface of the sleeves with White Protopet 1S.

 S 434-015

 (5)  
Install the new O-rings.

 S 424-016

 (6)  
Put the overflow valve in its installed position.

 S 434-017

 (7)  
Install the screws and washers.

 S 434-018

 (8)  
Install the three clamshell couplings.

 (a)  
For the 0.50 inch diameter lines, make sure the ends that connect are in line and not more than 0.28 inch apart.

 (b)  
For the 0.75 inch diameter lines, make sure the ends are in line and not more than 0.25 inch apart.

 (c)  
Move the sleeve until it is in the center of the connection.

 (d)  
Put the clamshell over the connection and latch the fasteners.

 (9)
Do this task: "Water System Pressurization" (AMM 38-15-60/201).

 S 614-020

 (10)
 Do this task to fill the water system:  "Water System Servicing (Fill)" (AMM 12-14-61/301).

 S 864-019
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. FREIGHTERS ú

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A
747-400 MAINTENANCE MANUAL
 S 714-021
 (11)
 Make sure that water comes from the overflow port at the service panel when the water tanks are full.

 S 794-022

 (12)
 Make sure there is no leakage at the overflow valve connections.

 S 714-023

 (13)
 Make sure the water flow is normal at the lavatory faucet.

 S 414-029

 (14)
 For the ceiling panels that were removed, do this task:  "Forward Cargo Container Compartment Ceiling and Sidewall Linings -Installation" (AMM 25-52-01/401).

 S 864-024

 (15)
 Do one of these tasks if it is necessary to pressurize the pneumatic system (AMM 36-00-00/201):

 (a)  
Pressurize the Pneumatic System with a ground air source.

 (b)  
Pressurize the Pneumatic System with the APU.

 (c)  
Pressurize the Pneumatic System with one or more engines.

 (16)
　
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