(2)  
AMM 38-41-00/201, Water Tank Pressurization System

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

 C.  Prepare for the Removal
 S 014-061
 (1)  
Open the WATER QTY IND circuit breaker on the P18 panel and attach a DO-NOT-CLOSE tag.

 S 014-021

 (2)  
Remove the access panel on the aft bulkhead in the aft cargo compartment.

 S 684-023

 (3)  
Use the pressure from the air manifold, air compressor, a service cart, or gravity to drain the potable water tank.

 (a)  
Use the air manifold pressure or the compressor pressure. 1) Pressurize the water system (AMM 38-41-00/201). 2) Turn the tank drain handle on the service panel to drain

 the water tank. 3) When the flow of water stops, remove the pressure from the water system (AMM 38-41-00/201). 4) Turn the tank drain handle to close the water drain valve.

 (b)  
Use gravity to drain the tank. 1) Remove the pressure from the water system (AMM 38-41-00/201). 2) Turn the tank drain handle and the fill valve handle for the water tank to open the valves.

 3)  When the flow of water stops, close the drain valve and the fill valve.
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 38-11-31
 ALL  ú ú 01 Page 401 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
FILL AND OVERFLOW VALVE
SEE A
SEE B
SERVICE PANEL FWD INBD
A
OUTBOARD MOUNTING BRACKET OUTBOARD STOP NUT
WASHER
INBOARD STOP NUT
FILL AND 
OVERFLOW  ADAPTER 
VALVE  TAB 
FILL LINE  CONNECTING 
PIN  FWD 
ADAPTER 
OVERFLOW LINE  SHAFT 

VALVE SHOWN IN CLOSED POSITION
B

INBOARD MOUNTING BOLT (2 LOCATIONS)
INBOARD MOUNTING BRACKET
FILL LINE
OVERFLOW
LINE

INBD
Water Fill and Overflow Valve Installation
Figure 401

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 38-11-31
 ALL  ú ú 02 Page 402 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 014-002
 (4)  Remove the access panel on the rear bulkhead in the aft cargo compartment.
 D. Remove the Fill Valve
 S 034-004
 (1)  
Disconnect the four lines from the fill valve.

 S 434-005

 (2)  
Install the caps on the four lines.

 S 034-006

 (3)  
Remove the shaft from the valve as follows:

 (a)  Remove the connect pin and the two washers from the shaft.
 S 034-007
 (4)  
Remove the inboard and the outboard stop nuts.

 S 014-008

 (5)  
Remove the inboard bracket that holds the fill valve as follows:

 (a)
Remove the connect bolts and washers in the bracket.

 (b)
Remove the inboard bracket and the fill valve.

 TASK 38-11-31-044-057
 3. Fill Valve Installation (Fig. 401)
_______________________
 A. References
 (1)  
AMM 12-14-00/301, Water Servicing

 (2)  
AMM 30-71-00/201, Water and Toilet Drain Anti-Icing System

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

 C. Install the Fill Valve
 S 214-012
 (1)  Make sure the fill valve is closed.
 NOTE: The fill valve handle on the service panel is vertical
____ to the airplane center line when the fill valve is closed.
 S 864-010
 (2)  
Put the fill valve on the outboard mounting bracket.

 (3)  
Install the inboard bracket.

 S 864-011
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