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 (3)  Install a new packing on the discharge check valve (1). (a) Lubricate the packing with petrolatum.
 S 434-018
 (4)  Install the bolts (21), washers (22) and nuts (23) (four locations) to attach the discharge check valve (1) to the housing (12).
 S 434-019
 (5)  Install a new packing (17) on the removal check valve (18). (a) Lubricate the packing with petrolatum.
 S 434-020
 (6)  Install the bolts and washers (six locations) to attach the removal check valve (18) to the housing (12).
 S 434-044
 (7)  Do these steps to install the housing (12) to the structure: (a) For the No. 1 and 4 main tank boost pumps, put the gasket seal (8) between the mounting flange on the housing (12) and the structure (View A-A). (b) For the No.1 and 4 main tank boost pumps, install the ring (28) against the structure (View A-A). (c) Hold the housing (12) from in the fuel tank and install the bolts (9) and washers (10) (seven locations) from out of the fuel tank.
 (d) (e) (f)  For the No. 2 main tank forward boost pumps, install the bolt (14) and washer (15) (two locations) to the support structure (13) (View A).For the No. 1 and 4 main tank boost pumps, install the screw (24) and washer (25) (four locations) to the support bracket (26) (View B). 1) Lockwire the screws (24).Install the bonding jumper (11), mounting bolt (27) and washer (10).
 NOTE:____ The bonding jumper should mate directly to the structure.
 (g)  Install lockwire on the mounting bolts (View C).

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747-400
MAINTENANCE MANUAL

 (h)  Apply a cap seal of BMS5-142 to the mounting bolt head (27) and the bonding jumper terminal (11) (Fig. 401, View A-A).
 NOTE: For this application, BMS5-95 Type 1 can be used as an
____
 alternate sealant.

 (i)  Apply these protective finishes to the rear spar at any cleaned areas not covered by the bonding jumper terminal and cap seal: 1) Alodine 600 (AMM 51-21-04/701) 2) BMS 10-20 Type II (AMM 28-11-00/801)
 S 434-024
 (8)  
Put a new packing (17) in the coupling on the pump inlet line (16).

 (a)  
Lubricate the packing with petrolatum.

 S 434-025
 (9)  
Connect the coupling to the removal check valve (18).

 S 434-026

 (10)
 Put a new packing (2) in the coupling on the pump discharge line (3).

 (a)  
Lubricate the packing with petrolatum.

 S 434-027
 (11)
 Connect the coupling to the discharge check valve (1) (AMM 28-00-00/201).

 S 644-028

 (12)
 Lift the flapper on the coolant and vapor discharge check valve and pour 1/2 to 1 pint of fuel into the housing (12).

 S 434-029

 (13)
 For the housings in the No. 1 or No. 4 main tanks, put a new packing in the coupling on the pump coolant and vapor discharge line.

 S 434-030

 (14)
 Connect the coupling to the pump coolant and vapor discharge port (6) on the housing (12) (AMM 28-00-00/201).

 S 434-031

 (15)
 Connect the pressure sensor line (4) and new washer (5), and the ejector pump pressure line (19) and new washer (20) at the discharge check valve.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 410 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 424-045
 (16) For the No. 1 and 4 main tanks, prepare the surface and connect the bonding jumper from the structure to the pump housing (12) (SWPM 20-20-00).
 NOTE: If the bonding jumpers on the line were disconnected or
____ removed, make sure that the bonding surfaces on the lines are clean and install the bonding jumpers (SWPM 20-20-00).
 S 764-048
 (17)
 Measure the bonding resistance between these components (SWPM 20-20-00):

 (a)
For the No. 1 and 4 main tanks, structure to pump housing.
　
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