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 Toilet drain | Foreign substance| |Connect toilet
 system leaking | between drain | |service cart and | valve and valve | |flush system | seat, plug and | |with minimum of | plug seat (if | |6 gallons of | installed) and/or| |water (Ref | drain tube cap | |12-17-00, SRV). | and seal. | | | | | | Drain valve and/ | Visually examine valve and |Replace defec-| or seat defective| seat for defects. |tive component | | | | Drain valve cable| Visually examine cable for |Replace damaged | damaged or impro-| defects and proper rigging |cable and/or | perly rigged | |rerig as | | | required | | | | Drain tube plug | Visually examine plug and |Replace damaged | and/or plug seat | seat for defects |plug and plug | defective (if | |seat | installed) | | | | | | Drain tube cap | Visually examine drain tube|Replace damaged | and/or seal | cap and seal for defects |cap and/or seal | defective | |as required | | |
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 38-32-00
 ALL ú

 ú 01 Page 103 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ................................................................................ TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY ................................................................................
 Ground flush | Check valve | Disconenct flush line at |Replace any connection | defective | toilet tank. Using non-|valve which does leaking | | metallic instrument, de-|not seat proper-
| | press and release check |ly or provide | | valve several times. |correct direc-| | Verify valve closes com-|tional control | | pletely with no tendency| | | to stick or bind. Examine| | | for deformation, cracks,| | | chips and/or buildup of| | | chemical solids|
 Forward drain | Unwanted material| |Connect toilet valve cable | between ball | |service cart and will not close | valve seat and | |flush system
 | the ball in the | |with minimum of | valve. | |6 gallons of | | | water (AMM | | | 12-17-00/301). | | | | Ball valve | |Replace ball | defective | |a valve (AMM | | | 38-32-91/401). | | | | Drain valve | Visually examine drain |Replace damaged | cable defective | valve cables for defects |cable or cable | | | assembly (AMM | | | 38-32-41/401). | | |
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 38-32-00
 ALL  ú
 ú  02  Page 104
 ú  Mar 15/95 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ................................................................................ TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY ................................................................................
 Forward drain  |  Ball valve or  |  Measure the force to pull  | If the force to
 valve cable  |  control cable  |  the handle at the service  | operate the
 hard to open  |  binding.  |  panel with a spring scale.  | control cable
 |  |  If the force is more than  | in step 3) is
 |  |  55 pounds, do these steps.  | less than 20
 |  |  1) Disconnect the toilet  | pounds, repair/
 |  |  tank control cable at the  | replace toilet
 |  |  ball valve.  | tank control
 |  |  2) Pull the control cable  | cable (AMM
 |  |  to see if it is binding.  | 38-32-41/401).
 |  |  3) If the force is more  | If the force in
 |  |  than 20 pounds, disconnect  | step 3) is more
 |  |  the ball valve control  | than 20 pounds
 |  |  cable from the ball valve.  | and the ball
 |  |  4) Move the ball valve by  | valve is not
 |  |  hand.  | binding, repair/
 |  |  5) If the ball valve is  | replace ball
 |  |  binding, replace the ball  | valve control
 |  |  valve (AMM 38-32-91/401).  | cable (AMM
 |  |  |  38-32-41/401).
 |  |  |
　
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