21-61-11
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 034-010
 (9)  
While you hold the mix valve, move the flexible couplings to the adjacent ducts (Ref 21-51-61/401).

 S 034-011

 (10)
 Remove the bolt which attaches the support rod to the mix valve.

 S 024-012

 (11)
 Remove the mix valve.

 TASK 21-61-11-404-013
 3.  Air Mix Valve Installation__________________________
 A. References
 (1)  
21-51-61/401, Flexible Coupling Assembly

 (2)  
36-05-00/201, Pneumatic System

 B. Access
 (1)  
Location Zones
 212 Left air conditioning bay
 214 Right air conditioning bay

 (2)  
Access Panels
 3303L A/C Access Panel
 3403R A/C Access Panel

 C. Procedure
 S 224-014
 (1)  
Make sure that the support rod for the mix valve is 7.55 inches between the bolt hole centers.

 (2)
Make sure that the V-clamps are on the adjacent ducts.

 (3)  
Lift the mix valve into its position.

 S 214-015
 S 424-016
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SUPPORT ROD 2 V-CLAMP
1(2 PLACES)
VALVE
ACTUATOR

ELECTRICAL CONNECTOR FLEXIBLE COUPLING (2 PLACES)
TO MIXING
CHAMBER

TO AIR CYCLE VALVE POSITIONMACHINE
TRANSMITTER ELECTRICAL CONNECTOR
VISUAL POSITIONVALVE
POSITION INDICATOR
HOT
COLD

INDICATOR
SEE A
1  WHEN INSTALLING AIR MIX VALVE, V-CLAMP AND COUPLING TEE BOLTS SHOULD NOT EXTEND EXTEND BELOW LOWER SURFACE OF CLAMP RING.
2  ROD LENGTH 7.55 INCHES BETWEEN BOLT
A

HOLE CENTERS.
Air Mix Valve Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 434-017
 (4)  
Install the bolt through the support rod and the mix valve lug. S 434-048

 BAY IF THE CLAMP OR THE BOLTS EXTEND BELOW THE CLAMP RING.

 (5)  
Install the V-clamps but do not tighten them. S 824-019

 (6)  
Turn the mix valve to align it with the other ducts. NOTE: Do not change the support rod length to align the mix valve

 CAUTION:_______ MAKE SURE THAT THE V-CLAMP AND THE FLEXIBLE COUPLING TRUNION
 BOLTS DO NOT EXTEND BELOW THE LOWER SURFACE OF THE CLAMP RING.
 YOU CAN CAUSE DAMAGE TO THE ACCESS DOOR OF THE AIR CONDITIONING

____ with the ducts.
 S 824-020
 (7)  
Make sure that all four mix valve ports are in the same plane and connect with the duct openings.

 S 824-021

 (8)  
If the mix valve does not connect with the ducts, do these steps:

 (a)  
Loosen the duct clamps.

 (b)
Adjust the ducts until the mix valve connects to the ducts. S 434-022

 (9)  
Install the flexible couplings (Ref 21-51-61/401). S 434-023

 (10)
 Tighten the flexible couplings.

 S 434-049 CAUTION: MAKE SURE THAT YOU KEEP A MINIMUM CLEARANCE OF 0.10 INCHES
_______ BETWEEN THE AIR MIX VALVE AND THE ADJACENT HYDRAULIC TUBES. THIS WILL PREVENT DAMAGE TO EQUIPMENT.
 (11)
 While you hold the mix valve, tighten all the loose clamps. S 214-025

 (12)
 Make sure that the bonding surfaces are clean. S 434-026

 (13)
 Install the bonding jumper.

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