D. Procedure
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 28-22-21
 ALL  ú ú 01 Page 404 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 654-049 WARNING: MAKE SURE THE NO. 1 TANK AND THE NO. 2 TANK DO NOT CONTAIN MORE
_______ THAN THE SPECIFIED QUANTITY OF FUEL. A FUEL SPILL CAN OCCUR.
 (1)  Make sure the No. 1 tank and the No. 2 tank each contain less than 1000 pounds (454 kilograms) of fuel.
 NOTE:____ This is the maximum quantity of fuel for a pitch of zero degrees. Smaller quantities of fuel can be necessary at different pitches.
 (a) (b)  If the fuel level in the center tank is higher than the fuel level in the wing tanks, close the removal valves for the two center tank boost pumps.Make sure you replace the gate assembly before the fuel level in the No. 1 tank is as high as the crossfeed valve.
 NOTE:____ If you moved fuel to the center tank to get the correct quantities in the wing tanks, fuel will flow slowly from the center tank to the No. 1 tank through the fuel scavenge system.
 (2)  S 864-018Open this circuit breaker and attach a DO-NOT-CLOSE tag: (a) P6 Main Power Distribution Panel 1) CROSSFD VALVE (for the fuel crossfeed valve)
 (3)  S 034-019Disconnect the electrical plug from the crossfeed valve.
 (4)  S 034-020Disconnect the bonding jumper from the crossfeed valve.
 (5)  S 494-021Put the container below the crossfeed valve to catch fuel.
 (6)  S 034-022Remove the nuts and the washers that attach the gate assembly.
 (7)  S 024-023Carefully move the gate assembly away from the opening in the rear spar.
 NOTE:____ If you are not scheduled to remove the port adapter assembly, make sure you did not loosen the bolts that attach it.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 28-22-21-404-024
 5. Crossfeed Valve Gate Assembly Installation
__________________________________________
 A. Consumable Materials
 (1)  
G01037 - Insulation Tape, MIL-I-23594B

 (2)  
B00316 - Aliphatic Naphtha TT-N-95

 B. References
 (1)  SWPM 20-20-00, Standard Wiring Practices
 C. Access
 (1)  Location Zone
 405 Right Fuel Tank

 D. Procedure
 S 114-025
 (1)  Clean these surfaces with the solvent and dry them with a lintfree cloth:
 (a)  
The O-ring groove in the housing of the gate assembly

 (b)  
The machined surface of the rear spar.

 S 434-026
 (2)  
Install a new O-ring, lightly lubricated with fuel, into the groove on the housing of the gate assembly.

 S 424-027

 (3)  
Carefully put the gate assembly into the port adapter through the opening in the rear spar.

 S 434-052
 WARNING: MAKE SURE "TOP" SHOWS ON THE TOP SIDE OF THE VALVE BODY DURING
_______ INSTALLATION. FAILURE TO INSTALL THE VALVE BODY CORRECTLY CAN CAUSE INJURY OR DAMAGE.
 (4) Install the nuts and the washers that attach the gate assembly.
 (a)  Tighten the nuts to a torque of 50-70 pound-inches.
 S 434-029
 CAUTION: MAKE SURE THAT THE WIRE BUNDLE HAS A LAYER OF TAPE TO GIVE
_______ PROTECTION FROM DAMAGE. DAMAGE FROM FRICTION CAN OCCUR TO THE WIRE BUNDLE.
 (5)  Connect the electrical plug to the actuator assembly.
 (a)  
Make the loose wire into a loop between the plug and the adjacent clamp if there is some loose wire.

 (b)  
Do not make a loop of wire between two clamps.

 (c)  
If it is necessary, move the clamps to put the loose wire in a good position. 1) Loosen the three clamps at the end of the wire. 2) Put the loose wire in a position between the plug and the
　
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