28-21-32
 ALL  ú ú 02 Page 401 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
FUELING STATION SEE A
A  FUELING CHECK VALVES (WITH FUELING MANIFOLD REMOVED) SEE B 
CHECK VALVES  MOUNTING SCREW  O-RING  WING FRONT SPAR 
ELBOW 
O-RING  BODY  FWD  INBD 
B 
Figure 401 Fueling Check Valve Installation 

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 28-21-32
 ALL  ú ú 01 Page 402 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. References
 (1)  AMM 28-21-21/401, Fueling Receptacle Manifold
 C. Access
 (1)  
Location Zone
 402 Right Wing Leading Edge

 (2)  
Access Panels
 6540 Refueling Station Access Door

 D. Procedure
 S 164-009
 (1)  Clean these surfaces and dry them with a lintfree cloth.
 (a)  
The machined surface of the body assembly.

 (b)  
The O-ring groove of the check valve.

 S 434-010
 (2)  Install a new O-ring, lightly lubricated with fuel, on the check valve.
 NOTE: Make sure you put the O-ring on the side of the check
____
 valve that has the poppet valve.

 S 424-011
 CAUTION: DO NOT LOOSEN THE O-RING OR PUSH IT OUT OF ITS CORRECT SHAPE
_______ WHEN YOU INSTALL THE CHECK VALVE. YOU CAN CAUSE A FUEL LEAK.
 (3)  
Install the check valve.

 (a)  
Put the check valve on the body assembly.

 (b)  
Turn the check valve to align the screw holes with the holes in the body assembly.

 (c)  
Install the mounting screws in the check valve.

 (d)  
Tighten all of the screws equally.

 (e)  
Make sure the check valve is parallel to the flange of the body assembly.

 (4)  
Install the fueling receptacle manifold (AMM 28-21-21/401).

 S 414-012
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 28-21-32
 ALL  ú ú 01 Page 403 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FUELING BODY OR ELBOW ASSEMBLY - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General
_______
 A.  This procedure has two tasks:
 (1)  
A task to remove the fueling body assembly or the elbow assembly from the wing front spar

 (2)  
A task to install the fueling body assembly or the elbow assembly on the wing front spar.

 B.  Three fueling body assemblies and one elbow assembly are installed on the wing front spar. The procedure to remove and to install all of these parts is almost the same.
 TASK 28-21-41-004-001
 2.  Fueling Body Assembly or Elbow Assembly Removal (Fig. 401)
_______________________________________________
 A.  References
 (1)  
AMM 28-10-00/201, Fuel Storage

 (2)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 (3)  
AMM 28-21-32/401, Fueling Check Valve

 (4)  
AMM 28-21-21/401, Fueling Receptacle Manifold

 B.  Access
 (1)  
Location Zone
 402 Right Wing Outboard Leading Edge

 (2)  
Access Panels
 7407 Fuel Tank Access Door
 7408 Fuel Tank Access Door

 C.  Procedure
 S 654-002
 WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES TO DEFUEL THE FUEL
_______ TANK AND TO GO INTO IT. AN EXPLOSION, INJURY TO PERSONS, AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Defuel the No. 2 fuel tank and prepare to go into it.

 S 654-003

 (2)  
If you are scheduled to remove the fueling body assembly for the center or the No. 1 tank, defuel the applicable tank (AMM 28-10-00/201).
　
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