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A
737-300/400/500MAINTENANCE MANUAL
TANK FLUSH PORT CAP 1 DRAIN VALVE
SEE A HANDLE
FLUSH
PORT

DRAIN VALVE ASSEMBLY SEE A
SEE B
DRIVE SHAFT
ASSEMBLIES
OPEN
LEVER

END NIPPLE
MOLDED SEAL
O-RING  CLOSE LEVER
TOILET SERVICE PANEL (EXAMPLE)
A
RETAINER
PLATE

FWD
SEAL
RETAINER

DRAIN
FLAPPER VALVE

FLAPPER VALVE
CAP SEAL
O-RING
DRAIN VALVE ASSEMBLY
B2
OUTER CAP
O-RING
PUSH-TO-OPEN LEVER
DRAIN VALVE ASSEMBLY
B3
1
NOT INSTALLED ON ALL AIRPLANES
2
SERVICE PANELS WITH OPEN/CLOSE LEVERS ON THE DRAIN VALVE ASSEMBLY
3 SERVICE PANELS WITH THE PUSH-TO-OPEN LEVER ON THE DRAIN VALVE ASSEMBLY
Service Panel Drain Valve Assembly
Figure 201 (Sheet 1)

F42309
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A 737-300/400/500MAINTENANCE MANUAL
DRAIN CAP
FLAPPER VALVE 
CAP SEAL 
MOUNTING SCREWS 
AND RETAINER 
PLATE SCREWS 
SEAL RETAINER 
RETAINER 
PLATE 

MOLDED SEAL
O-RING  (2 LOCATIONS) DRIVE SHAFT PLUG  (4 LOCATIONS) SHAFT RETAINER 
TAB  HOUSING ASSEMBLY 
END NIPPLE 
PLUG  SCRIBE MARK 
(2 LOCATIONS) LEVER SHAFT 
PIN (2 LOCATIONS) DRIVE SHAFT 
FLAPPER VALVE LOCK CAM  (4 LOCATIONS) DRIVE SHAFT O-RING DRAIN VALVE ASSEMBLY (EXPLODED VIEW) CAM PIN  (2 LOCATIONS) DRIVE SHAFT 
C
Figure 201 (Sheet 2) Service Panel Drain Valve Assembly 

F64384
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A 737-300/400/500MAINTENANCE MANUAL
 S 672-014
 (2)  Do these steps to drain the precharge:
 (a)  
Close the service panel drain valve.

 (b)  
Open the toilet tank drain valve.

 (c)  
Open the service panel drain valve cap.

 (d)  
Connect the drain hose to the service panel.

 (e)  
After 5 minutes, open the flapper valve.

 S 422-015
 (3)
Remove and discard the o-ring on the flapper valve (Fig. 201).

 S 642-017

 (4)  
Apply a thin layer of lubricant to the surface of the o-ring and install it on the flapper valve.

 S 422-016

 (5)  
Remove and discard the o-ring on the outer cap (Fig. 201).

 S 642-018

 (6)  
Apply a thin layer of lubricant to the surface of the o-ring and install it on the outer cap.

 S 792-018

 (7)  
Make sure there are no leaks at the service panel when the drain tube is filled with water (AMM 38-32-00/501).

 E. Put the Airplane Back to Its Usual Condition
 S 612-019
 (1)  Add the chemical precharge to the waste tank and do the remaining steps of the toilet servicing procedure (AMM 12-17-00/301).
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A
737-300/400/500MAINTENANCE MANUAL
 WASTE TANK DRAIN DUCT NIPPLE - REMOVAL/INSTALLATION
___________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task removes the drain duct nipple for the waste tank. The second task installs the drain duct nipple for the waste tank.
　
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