(5)  
Disconnect the drain line from the drain valve.

 (6)  
Remove the adapter connecting pin and the two washers.

 S 034-006
 S 034-007
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE A
WATER TANK
ACCESS 
PANEL 
WATER TANK 
DRAIN VALVE 
SEE  B 
O-RING  A 
WATER TANK 
TANK BOSS 
JAMNUT 
DRAIN VALVE  ADAPTER 
CLAMP  ADAPTER MOUNTING 
SCREW AND WASHER 
SHAFT 
COUPLING 
ADAPTER  SHROUD 
CONNECTING 
DRAIN  PIN 
LINE 

VALVE ACTUATOR SHAFT 
(SHOWN IN THE CLOSED 
POSITION) 
B
Water Tank Drain Valve Installation 
Figure 401 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 034-027
 (7)  
Pull the valve actuator shaft handle on the water service panel to disconnect the shaft and the coupling from the adapter.

 S 034-008

 (8)  
Remove the adapter mounting screw and washer.

 S 034-028

 (9)  
Remove the adapter.

 S 024-009

 (10)
 Loosen the jamnut and remove the drain valve.

 S 034-010

 (11)
 Remove the O-ring and jamnut from the drain valve.

 TASK 38-11-51-404-011
 3. Drain Valve Installation (Fig. 401)
________________________
 A. References
 (1)  
AMM 12-14-00/301, Passenger Water System

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

 (3)  
AMM 38-41-00/201, Water Tank Pressurization System

 B. Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 C. Install the Drain Valve
 S 434-012
 (1)  
Install the jamnut on the drain valve.

 (2)  
Install the O-ring in the groove on the drain valve.

 (3)  
Install the drain valve on the tank boss and tighten the jamnut.

 S 434-013
 S 424-014
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 434-015
 (4)  
Attach the adapter to the drain valve with the adapter mounting screw and washer.

 S 434-016

 (5)  
Connect the shaft coupling to the adapter with the connecting pin and washers.

 NOTE: Install the adapter connecting pin from the forward end
____ (valve closed), with the shaft handle in the closed position, as shown on Fig. 401.
 S 434-017
 (6)  
Connect the drain line to the drain valve.

 S 864-018

 (7)  
Fill the passenger water tank (AMM 12-14-00/301).

 S 864-019

 (8)  
Supply electrical power (AMM 24-22-00/201).

 S 864-020

 (9)  
Pressurize the water tank and remove the placards if they were installed when the pressure was released (AMM 38-41-00/201).

 S 864-021

 (10)
 Let 2 minutes occur for the pressure to become stable.

 S 794-022

 (11)
 Open the drain valve until the water starts to flow, then close the drain valve.

 S 794-023

 (12)
 Examine the drain valve for leaks.
　
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