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737-300/400/500MAINTENANCE MANUAL
 (4)  S 434-013Install the two bolts and washers that connect the fill valve to the inboard bracket.
 (5)  S 434-014Install the inboard and outboard stop nuts.
 (6)  S 024-059Remove the caps from the four lines.
 (7)  S 434-015Connect the four lines to the fill valve.
 (8)  S 424-016Connect the shaft to the fill valve as follows: (a) Install the washers and the connect pin. (b) Make sure the fill valve is closed.
 (9)  S 864-017Fill the water tank (AMM 12-14-00/301).
 S 214-019

 (10)
 Examine all of the fill valve lines and connections for leakage.

 S 414-020

 (11)
 Install the access panel on the aft bulkhead in the aft cargo compartment.

 S 084-060

 (12)
 Remove the placards that you installed when you removed pressure from the water system, if it is necessary.

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737-300/400/500MAINTENANCE MANUAL
 FORWARD LAVATORY DRAIN VALVE - REMOVAL/INSTALLATION
___________________________________________________
 1.  General_______
 A.  The Forward Lavatory Drain Valve is referred to as the Drain Valve in this procedure.
 B.  This procedure has two tasks.
 (1)  
A removal of the drain valve in the forward lavatory.

 (2)  
An installation of the drain valve.

 TASK 38-11-41-004-064
 2.  Drain Valve Removal (Fig.___________________401)
 A.  References
 (1)  AMM 38-41-00/201, Potable Water Sytem - Pressure Release
 B.  Access
 (1)  Location Zones
 (a)  200 Upper Half of Fuselage
 C.  Prepare for the Removal
 S 014-060
 (1)  Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  Circuit Breaker Panel, P18-3:
 1) 18F14 LAVATORY WATER HEATER A

 S 864-083
 (2)  
Do this task: Potable Water System - Pressure Release (AMM 38-41-00/201).

 S 014-065

 (3)  
Get access to the lavatory.

 S 014-066

 (4)  
Open the faucet to release the pressure and to drain some of the water.

 S 014-067

 (5)  
Open the cabinet below the sink to get access to the shutoff valve.

 D.  Drain Valve Removal
 S 024-068
 (1)  
Loosen the B-nuts for the tube connections at the drain valve [1].

 (a)  Use a rag to catch the water in the tubes.

 (2)  
Remove the screws [3] for the bracket [4].

 S 024-070

 (3)  
Remove the handle of the drain valve [1] and then loosen the nut and disconnect the bracket [4].

 (4)  
Remove the drain valve [1].

 S 024-069
 S 024-071
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737-300/400/500
MAINTENANCE MANUAL

FWD  (EXAMPLE) LAVATORY  ASEE PIPING WATER
 (4 LOCATIONS) [3] SCREW 
BSEE DRAIN VALVE  VALVE [1] DRAIN 
(2 LOCATIONS) [2] TUBING CONNECTION [4] BRACKET 
A WATER PIPING B DRAIN VALVE 

Lavatory Water Drain Installation
Figure 401

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