(10)
 Put the O-ring gasket in the shell assembly groove.

 S 434-017

 (11)
 Install the bag assembly into the shell.

 S 434-018

 (12)
 Install the O-ring gasket in the collector chamber groove.

 NOTE: You may have to put a small amount of grease on the O-ring
____ gasket to keep the gasket in the groove during the installation. Remove the unwanted grease.
 S 984-019
 (13) Move the shell assembly with the bag between the air duct and the collector chamber.
 NOTE: Do not move the O-ring gasket and keep the bag support in the
____ center of the shell as much as is possible.
 S 434-020
 (14)
 Install the clamp that holds the shell to the collector assembly.

 S 434-021

 (15)
 Install the duct clamp at the aft end of the water separator.

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737-300/400/500MAINTENANCE MANUAL
 S 434-022
 (16) Install the support bracket clamp of the water separator.
 E. Do a Test For Leaks
 S 864-023
 (1)  
Supply electrical power (Ref 24-22-00/201)

 S 864-024

 (2)  
Pressurize the pneumatic system to approximately 25 psi (Ref 36-05-00/201).

 S 864-025

 (3)  
Operate the air cycle system of the air conditioning.

 S 864-026

 (4)  
Put the temperature switch to manual COOL until the air mixture valve goes to the fully COLD position.

 S 794-027

 (5)  
Examine the duct for leakage at the clamps.

 (a)  
A small leak is ok

 (b)  
You must repair a large leak

 S 864-034
 (6)  Put the temperature switch to OFF.
 F. Put the Airplane Back to Its Usual Condition
 S 864-028
 (1)  
Stop the air cycle system.

 S 864-029

 (2)  
Remove the pneumatic power if it is not necessary
 (Ref 36-05-00/201).

 S 864-030

 (3)  
Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

 (4)  
Close the equipment bay doors for the air conditioning.

 S 914-031
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737-300/400/500
MAINTENANCE MANUAL

SEE  B 
SEE  A 
SPRING RETAINING  SEE  C  (BAG) COALESCER  SHELL ASSEMBLY WATER SEPARATOR  A 
CLAMP 
ASSEMBLY VALVE BYPASS 
SUPPORT BAG 
B CHAMBER COLLECTOR  FWD  ASSEMBLY SHELL  CLAMP  CHAMBER COLLECTOR 
COALESCER (BAG) WATER SEPARATOR  GASKET O-RING 
UP 
FWD  C SUPPORT BAG  ASSEMBLY SPRING-CHAIN 
Figure 401 Water Separator Coalescer Installation 

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737-300/400/500MAINTENANCE MANUAL
 WATER SEPARATOR COALESCER (BAG) - INSPECTION/CHECK
__________________________________________________
 1.  General_______
 A.  This task does a check of the condition of the water separator coalescer.
 B.  Fog or high humidity in the control cabin shows a clogged bag in the water separator coalescer. Noise that you hear again and again through the distribution system for the air conditioning also shows a clogged bag. When the bag becomes clogged, the pressure increases on the piston for the bag condition indicator. This pressure pushes the disk on the piston shaft to the red area of the bag condition indicator. When the disk is in the red area, you must replace the bag.
　
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