28-22-08
 ALL  ú ú 01 Page 404 ú May 28/99

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757
MAINTENANCE MANUAL

 S 944-020
 WARNING: OBEY THE FUEL TANK ENTRY PRECAUTIONS (AMM 28-11-00/201).
_______ FAILURE TO OBEY THE FUEL TANK ENTRY PRECAUTIONS COULD CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Obey the fuel tank entry precautions (AMM 28-11-00/201).

 S 434-009

 (2)  
Put a new O-ring in the groove on the flange of the removal check valve.

 S 824-021

 (3)  
Align the flange of the removal check valve with the flange of the fuel boost pump or fuel override pump.

 S 434-022

 (4)  
Install the six screws, washers and nuts with the bonding jumper on one of the screws.

 S 424-010

 (5)  
Install the flexible half coupling to attach the pump inlet line and the removal check valve (AMM 28-25-05/401).

 S 434-011

 (6)  
Install all the fittings on the pump inlet line (AMM 28-22-07/401).

 S 414-012

 (7)  
For the removal check valves of the fuel override pumps, install the baffle doors, 134DZ, 134CZ, and 134BZ (AMM 06-41-00/201).

 S 414-023

 (8)  
For the removal check valves of the fuel override pumps, install the center tank access door, 134AZ (AMM 28-11-02/401).

 S 414-024

 (9)  
For the removal check valves of the fuel boost pumps, install the applicable center tank access door, 531AB or 631AB (AMM 28-11-02/401).

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 28-22-08
 ALL  ú ú 01 Page 405 ú May 28/99

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757 MAINTENANCE MANUAL
 BOOST PUMP DISCHARGE CHECK VALVE - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General_______
 A.  A discharge check valve is installed on each fuel boost pump and fuel override pump. The discharge check valve prevents the flow of fuel back through the fuel boost pump or fuel override pump.
 B.  This procedure contains two tasks. The first task removes the discharge check valve. The second task installs the discharge check valve.
 TASK 28-22-09-004-001
 2.  Remove the Discharge Check Valve (Fig. 401)________________________________
 A.  References
 (1)  
AMM 06-41-00/201, Fuselage (Major Zones 100 and 200) Access Doors and Panels

 (2)  
AMM 28-11-00/201, Fuel Tanks

 (3)  
AMM 28-11-02/401, Center Tank Access Door
　
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