ALTERNATE SOURCE 
SELECTOR VALVE NO. 2 
INSTALLATION 
BSEE 
MOUNTING 
BRACKET 
FWD 
ALTERNATE SOURCE 
SELECTOR VALVE 
NO. 1 INSTALLATION  KEEL 
ASEE  BEAM 
ALTERNATE SOURCE 
SELECTOR VALVE 
NO. 1 
CSEE 
HYDRAULIC SYSTEM 2 
PRESSURE TRANSMITTER 
FWD 
ALTERNATE SOURCE SELECTOR 
VALVE NO. 1 INSTALLATION 
A 

ALTERNATE SOURCE NO. 2 SELECTOR VALVE  INBD  REAR SPAR LEFT WING 
SEE  D 

ALTERNATE SOURCE SELECTOR
VALVE NO. 2 INSTALLATION

B

Alternate Source Selector Valve Installations
Figure 401 (Sheet 1)

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A
747-400 MAINTENANCE MANUAL
O-RING (2 LOCATIONS)  ADAPTER (2 LOCATIONS)
BACKUP RING
(2 LOCATIONS)

ADAPTER
O-RING
(2 LOCATIONS)

O-RING
BOLT

BACKUP RING (4 LOCATIONS)O-RING
O-RING
WASHER

(2 LOCATIONS)
(4 LOCATIONS)

ADAPTER (2 LOCATIONS)
BACKUP RING (2 LOCATIONS)
ADAPTER (2 LOCATIONS)
O-RING (2 LOCATIONS)
BACKUP RING (2 LOCATIONS) ADAPTERO-RING
O-RING  (2 LOCATIONS)
(2 LOCATIONS)
(2 LOCATIONS) BACKUP RING (2 LOCATIONS)
ADAPTER
O-RING O-RING
ALTERNATE SOURCE SELECTOR (2 LOCATIONS) BACKUP RING
VALVE NO. 1BOLT
O-RING

(4 LOCATIONS) C
O-RING (4 LOCATIONS) WASHER (2 LOCATIONS)
ADAPTER (2 LOCATIONS)
BRACKET BACKUP RING (2 LOCATIONS)
ADAPTER (2 LOCATIONS)
O-RING (2 LOCATIONS)
BACKUP RING (2 LOCATIONS)
O-RING (2 LOCATIONS)
ALTERNATE SOURCE SELECTOR VALVE NO. 2
D
Alternate Source Selector Valve Installations
Figure 401 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 S 844-029
 (2)  
Make sure the wheel chocks are installed.

 S 864-037

 (3)  
If necessary, release the parking brake.

 S 844-022
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 844-023

 (5)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 S 864-040

 (6)  
Remove the pressure from hydraulic systems No. 1, 2, and 4
 (AMM 29-11-00/201).

 E.
Procedure

 S 024-024
 (1)  
Remove the selector valve.

 (a)  
Disconnect the hydraulic lines from the selector valve.

 (b)  
Put caps or plugs on the hydraulic lines.

 (c)  
Remove four bolts and washers that attach the selector valve to the mounting bracket and remove the selector valve from the airplane.

 (2)  
Remove the adapters from the ports of the selector valve.

 (3)  
Discard the O-rings.

 (4)  
Put plugs in the ports of the selector valve.

 S 034-009
 S 034-025
 S 494-010
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