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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 TOILET SYSTEM - TROUBLE SHOOTING
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 1.  General
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 CAUTION: WHEN TROUBLE SHOOTING THE TOILET FLUSHING SYSTEM, DO NOT OPERATE
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 THE FLUSH PUMP WHEN THE TANK IS DRY.

 A.  These procedures apply to each toilet system. Trouble shooting of the toilet flushing system is outlined in the trouble shooting chart, part 3. Procedures for correction of problems not directly related to the flushing system are described in part 2.
 2.  Toilet System - Trouble Shooting
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 A.  An unpleasant odor from the toilet unit indicates improper servicing of the toilet system. To correct, drain and flush the toilet system and make sure the recommended service procedure is being followed including use of the proper chemical solution.
 B.  Liquids accumulated in the drain tube are either from a leaking toilet tank or from the lavatory floor drain which empties into the drain tube. If the leakage is from the tank, a damaged or obstructed drain valve or valve seat is indicated. To isolate the cause of the leakage, drain and flush the toilet system, remove the tank top (if so equipped) or remove the drain valve from tank and examine for obstruction or damage to the valve or the valve seat. If the valve is obstructed, remove the obstruction. If the valve is damaged, replace the valve. If the valve seat is damaged, replace the toilet tank.
 NOTE: On some toilet tanks, it is possible to examine for and clear
____ the obstructed drain valve through the toilet bowl separator with a suitably bent rod.
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 ALL  ú ú 03 Page 101 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 3. Toilet Flushing System Trouble Shooting Chart
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 TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY ................................................................................ Toilet flushes | Defective timer | |Replace timer continuously | | |
 | | | Flushing starts| Defective tubing | Visually examine flush |Replace or and stops properly,| | tubing between flush motor |repair defective but with in-| | and toilet bowl while |tubing or sufficient | | while toilet is operating. |connections fluid flow | | If leakage is observed in|
 | | in tubing or at the| | | connections, it is| | | defective.| | Filter clogged | Service toilet (12-17-00) |Remove motor-| | and visually check filter |pump-filter | | holes. If plugged with |assembly. Clean | | debris, filter is clogged. |filter, using | | | bristle brush | | | | | NOTE: Removal of motor-|in strong solu-
____ | | pump-filter assembly|tion of soap and | | may not be necessary|water, rinse | | if the clogging de-|thoroughly and | | bris can be accessed|dry. | | via separator and| | | removed using| | | bristle brush.| | | | | Defective motor, | If leakage was not observed|Replace defec-| filter, or pump | in tubing and filter not |tive motor-| | clogged, the flush motor, |pump-filter | | pump, or filter, is |assembly. | | defective.| | | |
 Toilet does  | Defective wiring | Examine for power to timer |Replace or
 not flush  | | and continuity of wiring |repair defec-| | between timer and flush |tive wiring. | | motor. If power is not| | | available or continuity is| | | not present, the wiring is| | | defective.| | | |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ................................................................................ TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY ................................................................................
 | Defective timer | Examine for continuity |Replace | | through timer with flush |defective | | handle depressed. If the |timer | | continuity is not present,| | | the timer is defective.| | | | | Defective motor, | If the timer and wiring are|Replace defec-| filter, or pump | not defective, the flush |tive motor-pump-| | motor, pump, or filter is |filter assembly. | | defective.| | | |
　
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