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DRAIN VALVE(EXAMPLE LOCATION)
CONTROL CABLE DRAIN VALVE
TANK DRAIN LINE GROUND FLUSH LINE
GROUND FLUSH LINE
NO. 4 TOILET OVERFLOW TUBE INLET(EXAMPLE LOCATION)
AUXILIARY TANKCONTROLDRAIN VALVEFLUSH PORTSGROUND FLUSH LINE
AUXILIARY TOILETWASTE TANK GROUND FLUSH LINE
AUXILIARY TANK
LEFT AFT TOILET
DRAIN LINETOILET
DRAIN VALVE CONTROL
SERVICE PANEL CABLE - NO. 4 TOILET
DRAIN VALVE
1ALL EXCEPT AIRPLANES WITHCONTROL CABLE -DRAIN VALVERINSE WATER
MODULAR LAVATORIESLEFT AFT TOILET CONTROL CABLE -
FWD WASTE WATERAUXILIARY TANK
2AIRPLANES WITH MODULAR LAVATORIESNOTE: FOR TOILET FLUSH MOTOR,
3RECOMMENDED CONFIGURATION
AFT TOILET SYSTEM EXAMPLE
TANK SHROUD AND TANK DRAIN4ALTERNATIVE CONFIGURATION (LEFT AFT LAVATORY 1SHOWN) VALVE COMPONENT ILLUSTRATIONSSEE FIG. 1
5 NOT INSTALLED ON ALL AIRPLANES
115V AC
BUS 1
OR
BUS 2
C835,
C888

10 SECCHANGEOR
TIMER OVER C889
CONTROLFILTER
TOILET
FLUSH

FLUSH TIMER SWITCHMOTOR
TANK DRAINP18-4 CIRCUIT
VALVE BREAKER PANEL
TO OTHERTOILET TANKS
AFT TOILET DRAIN HEATERLEFT AFT TOILET (REF 30-71-00/001)FLUSH PORTFLUSH PORT
AUXILIARY
REMOVABLE
TOILET TANK

DRAIN PLUG HINGED FLUSH PORT DRAIN CAPLEFTFORWARDTOILET DRAIN VALVECONTROL HANDLELEFT AFT TOILET
HINGED
DRAIN VALVE
DRAIN CAP 4

CONTROL HANDLEAUXILIARY TANK
DRAIN VALVECONTROL HANDLELEFT FORWARD TOILET
AFT TOILET SERVICE PANEL(EXAMPLE) Aft Toilet SystemFigure 2 (Sheet 1)
A 737-300/400/500MAINTENANCE MANUAL
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 ALL  ú ú 14 Page 4 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TOILET TANK SHROUD
ELECTRICAL CONNECTOR
TIMER
TANK OVERBOARD VENT LINE
GROUND FLUSH LINE
CHECK VALVE
CONTROL CABLE QUICK DISCONNECT TOILET FLUSH MOTOR
TIEDOWN ROD (2 LOCATIONS)
OUTBD FWD
TANK DRAIN VALVE
AFT TOILET EXAMPLE 2(LAVATORY D SHOWN)
Aft Toilet System
Figure 2 (Sheet 2)

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 ALL  ú ú 09 Page 5 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E86201
A 737-300/400/500MAINTENANCE MANUAL
 6.  Toilet Flush Motor-Pump-Filter Assembly (Fig. 1)
_______________________________________
 A.  The motor-pump-filter assembly has a motor, a pump, and a filter. The assembly mounting plate, with six mounting bolts, is installed on the toilet top near the toilet bowl.
 (1)  
The motor for the pump impeller is direct drive. The impeller drains the fluid from the toilet tank to a filter. The fluid then flows to a spray ring in the toilet bowl (Fig. 1).

 (2)  
An overheat switch is installed in the motor. The overheat switch will open when the motor temperature is more than the safe operating limit. When the motor temperature cools to the operating limit, the overheat switch will close to operate the motor.

 (3)  
The filter is a cylindrically shaped basket with holes to allow flush fluid to be drawn from the tank and prevent debris from clogging the pump.

 7.  Toilet Tubing (Figs. 1 and 2)
_____________
 A.  The toilet flush line connects the pump outlet to a flush ring attached to the toilet bowl. Nozzles on the flush ring direct a stream of liquid into the bowl.
 8.  Toilet Waste Tank (Figs. 1 and 2)
_________________
 A.  Toilet tanks with fasteners along the periphery of the top of the tank have removable tops while tanks without the fasteners are one-piece without a removable top. On tanks with removable top, a rubber gasket is placed along the top edge of the tank to form a water tight seal when the tank top is installed. The removable top allows removal of all components on tank top from tank body as a unit.
 B.  In lavatories equipped with a catch basin, the toilet tank is installed in the catch basin. The catch basin will drain the water leakage and the moisture condensation to prevent tank corrosion. The water in the catch basin will drain to the toilet drain line.
　
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