S 794-033

 (8)  
Do a check of the sequence valve for leaks:

 (a)
Move the ground release handle for the landing gear doors to the DOORS OPEN and the DOORS CLOSED position two times.

 (b)
Move the ground release handle to the DOORS OPEN position.

 (c)  
Do a check for leaks at the sequence valve.

 (d)  
Move the control handle to the UP position.

 NOTE: You must push the button for the lever lock override.
____
 (e)  
Do a check for leaks at the sequence valve.

 (f)  
Move the control handle to the DN position.

 S 864-034
 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.
 (9)  Pressurize hydraulic system No. 1 (Ref 29-11-00/201).
 S 864-015
 WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR
_______ OPERATION AREA. A FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (10) Move the ground release handle for the landing gear doors to the DOORS CLOSED position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-32-04
 ALL  ú ú 01 Page 407 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-016
 (11) Remove system No. 1 and 4 hydraulic power if it is not necessary (Ref 29-11-00/201).
 TASK 32-32-04-004-017
 4. Wing Landing Gear Downlock-Operated Sequence Valve Mechanism Removal
____________________________________________________________________
 A. References
 (1)  
09-11-00/201, Towing

 (2)  
29-11-00/201, Main Hydraulic Supply System

 (3)  
32-00-30/201, Landing Gear Door Locks

 (4)  
IPC 32-32-04 Fig. 2

 B.
Access

 (1)  
Location Zone
 735 Wing Landing Gear, LH
 745 Wing Landing Gear, RH

 C.
Prepare for the Removal

 S 494-035
 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.
 (1) Install the ground locks in all landing gear (Ref 09-11-00/201).
 S 494-019
 WARNING:  YOU MUST CAREFULLY DO THE STEPS IN THE TASKS 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.
 (2)  Do this task: "Wing Landing Gear Door Lock Installation" (Ref 32-00-30/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-32-04
 ALL  ú ú 01 Page 408 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 494-036
 (3)  
Do this task: "Body Landing Gear Door Lock Installation" (Ref 32-00-30/201).

 S 864-020

 (4)  
Remove the pressure from hydraulic system No. 4 (Ref 29-11-00/201).

 D.
Remove the Sequence Valve Mechanism.

 S 024-021
 (1)  
Remove the sequence valve mechanism (Fig. 401):

 (a)  
Remove the striker arm (1) from the upper side strut.

 (b)  
Remove the mechanism outer cover (6) and the top cover (5).

 (c)  
Remove the bolt (9) to disconnect the link (11) from the lever (7).

 (d)  
Remove the bolts (3) and remove the clevis assembly (10).

 (e)  
Remove the bolt (12) and remove the link (11).

 (f)  
Remove the bolt (8) and disconnect the lever assembly from the clevis.
　
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