S 424-083
 CAUTION:_______BE CAREFUL WHEN YOU INSTALL THE RETAINING RING. YOU CAN DAMAGE THE O-RING SEALING SURFACE IN THE HOUSING BODY.
 (10) Insert the poppet guide retainer (O-ring end first) in the housing body.
 NOTE: Insert the side with the O-ring and angled surface first.
____
 S 424-071
 (11)
 Apply sufficient force to the poppet guide or poppet guide retainer to fully compress the spring and hold.

 S 424-072

 (12)
 Install the retaining ring in the groove in the housing body.

 S 424-073
 CAUTION: MAKE SURE THE SPRING IS INSTALLED CORRECTLY BEFORE YOU RELEASE
_______ THE SPRING. DAMAGE TO THE INTERNAL SURFACE OR THREADS OF THE HOUSING BODY COULD OCCUR.
 (13)
 Release the spring and slowly let the poppet guide rest on the poppet guide retainer.

 (14)
 Lightly lubricate the O-ring for the strainer cap with petrolatum.

 (15)
 Install the O-ring on the strainer cap.

 S 644-074
 S 424-075
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747-400 MAINTENANCE MANUAL
 S 644-076
 (16)
 Lightly and evenly lubricate the threads of the strainer cap that you can see with dry film lubricant.

 S 424-077

 (17)
 Put the washer and fuel strainer in the strainer cap.

 S 424-078

 (18)
 Install the strainer cap in the housing body.

 S 434-079

 (19)
 Torque the cap to 250 - 275 pound-inches.

 S 434-080

 (20)
 Lockwire the strainer cap to the housing body.

 (21)
 Do the scavenge system operational test (AMM 28-15-00/501).

 S 714-092
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747-400 MAINTENANCE MANUAL
 RESERVE AND MAIN TANK INTERCONNECTION - DESCRIPTION AND OPERATION
_________________________________________________________________
 1.  General_______
 A.  Reserve and main tanks are interconnected to facilitate fuel transfer during normal fuel feed, defueling, or jettison operations. Fuel transfer and tank interconnection is limited to the transfer of fuel by gravity flow from reserve to inboard main tanks, and outboard main to inboard main tanks.
 B.  Tank interconnection is accomplished through the use of electric motor-driven shutoff valves located in the transfer lines between the tanks. Power to the valves is 28 volts dc supplied from the P7 overhead circuit breaker panel.
 C.  The reserve tank transfer valves are used to transfer fuel from the reserve to the inboard main tanks during a normal fuel feed operation to move the fuel to a usable location. Operation of the valves is controlled automatically by the fuel system management card. The valves are also used during a defueling or jettison operation. During defueling, operation of the valves is controlled by a switch on the maintenance overhead panel P461.
 D.  The main tank transfer valves are used to transfer fuel from the outboard main tanks to the inboard main tanks during a jettison operation. The main tank transfer valves are controlled automatically by the fuel jettison control card. In the event that both boost pumps in an outboard main tank fail, fuel can be transferred inboard using a switch on the miscellaneous switch module on the pilots' overhead panel P5.
 2.  Reserve Tank Transfer Valve (Fig. 1)___________________________
 A.  The reserve tank transfer valves control the transfer of fuel from the reserve tanks to the inboard main tanks. Two valves are installed for each reserve tank to provide redundancy and ensure that fuel can be transferred in the event of a single valve failure. For the No. 2 reserve tank, the inboard reserve tank transfer valve is referred to as 2A and the outboard transfer valve as 2B. For the No. 3 reserve tank, the inboard reserve tank transfer valve is referred to as 3A and the outboard transfer valve as 3B.
　
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