S 864-015

 (12)
 Remove hydraulic power from system No. 1 if it is not necessary (Ref 29-11-00/201).

 TASK 32-33-04-004-016
 4. Body 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 32-33-04 Fig. 2

 B.
Access

 (1)  
Location Zone
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

 C.
Procedure

 S 494-030
 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).

 S 494-031

 (3)  
Do this task: "Body Landing Gear Door Lock Installation" (Ref 32-00-30/201).

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 32-33-04
 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 864-020
 (4)  
Remove the pressure from hydraulic system No. 1 (Ref 29-11-00/201).

 S 024-021

 (5)  
Remove the valve mechanism (Fig. 401):

 (a)  
Remove the bolts (5).

 (b)  
Remove the striker arm (4) from the upper jury strut.

 (c)  
Remove the bolts (10 and 14).

 (d)  
Remove the clevis assembly (9), the lever (7), and the link (11).

 (e)  
Remove the bolt (8).

 (f)  
Remove the link (11).

 (g)  
Remove the bolt (13).

 (h)  
Disconnect the lever assembly from the clevis.

 (i)  
Remove the roller (12) from the lever (7).

 TASK 32-33-04-404-022
 5.  Body Landing Gear Downlock-Operated Sequence Valve Mechanism Installation_________________________________________________________________________
 A. Special Tools and Equipment
 (1)  
G12001 - Rigging Pins BD-3 (LH) and BD-4 (RH) - 0.185 (+0.003/-0.000) inch diameter x 3.0 inches long

 B.
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 32-33-04 Fig. 2

 C.
Access

 (1)  
Location Zone
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

 D.
Procedure

 S 424-024
 (1)  
Install the valve mechanism (Fig. 401):

 (a)  
Install the roller (12) on the lever (7).

 (b)  
Install the lever (7) in the clevis with the bolt (13).

 (c)  
Install the link (11) on the clevis (9) with the bolt (8).

 (d)  
Connect the link (11) to the valve with the bolt (10).

 (e)  
Connect the clevis (9) to the valve with the four bolts (14) and the thin washers adjacent to the bolt heads.

 (f)  
Install the lockwire through the bolt heads.

 (g)  
Install the striker arm (4) on the upper jury strut with the bolts (5).

 S 824-025
 (2)  
Adjust the valve mechanism:

 (a)  
Install the rigging pin through the clevis assembly and the link.

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