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____ install them. You must not twist or cause the hydraulic hoses to have kinks when you install them.
 (a)  Install the clamp (6) with the bolt (7), the clip bolt lug (8), the block lug (9), the washer (10), and the nut (11).
 S 644-021
 (12) Apply grease to the actuator (1) and the bolts (3 and 5) through the grease fittings (30) (AMM 12-21-01/301).
 S 494-022
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (13)
 Make sure you install the ground locks in all landing gear (AMM 09-11-00/201).

 S 864-023

 (14)
 Make sure the ground release handles for the doors are in the DOORS OPEN position.

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747-400
MAINTENANCE MANUAL

 S 864-046

 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
 SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER.  AILERONS, RUDDERS,
 ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS
 CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER.  THIS CAN
 CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

 (15)
 Supply system No. 4 hydraulic pressure (AMM 29-11-00/201).

 S 794-041

 (16)
 Do a check of the actuator for hydraulic leaks:

 (a)  
Open the bleed valve (16) on the top of the head end of the actuator.

 (b)  
When the fluid is free of bubbles, close the bleed valve.

 (c)  
Move the control handle to the DN position. 1) Keep the control handle in the DN position for 3 minutes. 2) Make sure the actuator piston tries to retract

 approximately 1/4 inch. 3) Do a check for leaks.

 (d)  
Move the control handle to the UP position. 1) Keep the control handle in the UP position for 3 minutes. 2) Make sure the actuator piston tries to extend

 approximately 1/4 inch. 3) Do a check for leaks.
 S 864-027
 (17) Move the control handle to the DN position.
 S 094-028
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASKS BELOW TO REMOVE
_______ THE DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (18)
 Do this task:  "Removal of the Door Locks from the Doors for the Wing Landing Gear" (AMM 32-00-30/201).

 S 094-042

 (19)
 Do this task:  "Removal of the Door Locks from the Doors for the Body Landing Gear" (AMM 32-00-30/201).

 (20)
 Close the access doors (AMM 06-09-08/201).

 S 414-029
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747-400 MAINTENANCE MANUAL
 WING LANDING GEAR DOOR-OPERATED SEQUENCE VALVE - REMOVAL/INSTALLATION
_____________________________________________________________________
 1.  General_______
 A.  This procedure contains these two tasks:
 (1)  
The removal of the door-operated sequence valve for the wing landing gear

 (2)  
The installation of the door-operated sequence valve for the wing landing gear.

 B.
To remove the door-operated sequence valve these steps are necessary:

 (1)  
Disconnect the hydraulic lines from the valve

 (2)  
Remove the valve cover

 (3)  
Disconnect the rod from the door for the wing landing gear

 (4)  
Remove the valve

 (5)  
Remove the hydraulic fittings from the valve.

 C.
To install the door-operated sequence valve these steps are necessary:

 (1)  
Install the hydraulic fitting

 (2)  
　
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