(2)  
Remove the mounting adapter.

 (3)  
Defuel the No. 1 fuel tank.

 TASK 28-22-31-004-001
 2.  APU Shutoff Valve Actuator Assembly Removal (Fig. 401)
___________________________________________
 A.  Access
 (1)  Location Zone
 310 Left Wing Wheel Well

 B.  Procedure
 S 864-002
 (1)  Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P6 Main Power Distribution Panel
 1) APU CONT

 S 034-003
 (2)
Disconnect the electrical plug from the APU shutoff valve.

 (3)  
Disconnect the bonding jumper from the APU shutoff valve.

 S 034-004
 S 034-005
 CAUTION: HOLD THE ACTUATOR ASSEMBLY UP TO MAKE SURE ITS WEIGHT IS NOT
_______ ON THE SHAFT. YOU CAN CAUSE DAMAGE TO THE SHAFT.
 (4)  
Hold the actuator assembly up and remove the mounting screw.

 S 024-006

 (5)  
Remove the actuator assembly.

 (a)  
Carefully move the actuator assembly away from the mounting adapter until the output shaft is out of the mating part.

 (b)  
Lift the actuator assembly out of the airplane.

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 28-22-31
 ALL  ú ú 02 Page 401 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

ENGINE NO. 1
VALVE SEE A APU FUEL  SEE  B 
UNION WITH O-RING 
WING REAR SPAR 
VALVE BODY ASSEMBLY  O-RING 
FWD  INBD  B MOUNTING ADAPTER ACTUATOR ASSEMBLY BONDING JUMPER 

WING SPAR 
A MANUAL OVERRIDE HANDLE BODY ASSEMBLY MOUNTING SCREW ACTUATOR MOUNTING SCREW ELECTRICAL PLUG  APU FUEL VALVE 

APU Fuel Shutoff Valve Installation
Figure 401

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 28-22-31
 ALL  ú ú 01 Page 402 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 28-22-31-404-007
 3. APU Shutoff Valve Actuator Assembly Installation
________________________________________________
 A. Equipment
 (1)  
T477W - Bonding Meter, Avtron Manufacturing Co., Cleveland, OH

 (2)  
MIL-G-3545 - grease

 B. References
 (1)  AMM 20-22-01/601, Electrical Bonding
 C. Access
 (1)  Location Zone
 310 Left Wing Wheel Well

 D. Procedure
 S 944-008
 (1)  Apply a thin layer of the grease to the keyway of the output shaft.
 S 424-036
 CAUTION: HOLD THE ACTUATOR ASSEMBLY UP TO MAKE SURE ITS WEIGHT IS NOT
_______ ON THE SHAFT. YOU CAN CAUSE DAMAGE TO THE SHAFT.
 (2)  Put the output shaft into the input shaft.
 (a)  
Turn the output shaft until the keyway is aligned with the key in the input shaft.

 (b)  
Carefully move the output shaft into the input shaft until the actuator mounting lugs touch the mounting adapter.

 S 434-010
 (3)  
If the mounting holes on the actuator assembly are not aligned with the mating holes, carefully turn the assembly to align the holes.

 S 434-011

 (4)  
Install mounting screws on the actuator assembly.

 (5)  
Connect the bonding jumper to the actuator assembly.

 (6)  
Do a check of the electrical bond (AMM 20-22-01/601).

 S 434-012
 S 284-013
 NOTE: The bonding resistance must not be more than 0.01 ohm.
____
 S 434-014
 (7)  
Connect the electrical plug to the actuator assembly.

 S 864-015

 (8)
Close this circuit breaker and remove the DO-NOT-CLOSE tag:

 (a)  P6 Main Power Distribution Panel
 1) APU CONT

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