S 494-016

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

 S 864-004

 (4)  
Remove the pressure from hydraulic system No. 1 (Ref 29-11-00/201).

 E.
Procedure

 S 024-005
 (1)  
Remove the sequence valve (Fig. 401):

 (a)  
Disconnect the hydraulic hoses from the valve.

 (b)  
Install the caps on the hydraulic hoses.

 (c)  
Hold the rod against the spring pressure and disconnect the rod from the uplock mechanism.

 (d)  
Release the spring pressure.

 (e)  
Disconnect the rod from the valve.

 (f)  
Remove the three valve attach bolts and remove the valve.

 (g)  
Remove the hydraulic fittings from the valve.

 (h)  
Install the plugs in the valve ports.

 TASK 32-33-06-404-006
 3. Body Landing Gear Uplock-Operated Sequence Valve Installation
_____________________________________________________________
 A. Standard Tools and Equipment
 (1)
Hydraulic reducer union - 5/8 to 1/2 inch, threads per MIL-S-8879

 B.
Consumable Materials

 (1)  
D00288 Lubricant - MCS 352 (Skydrol Assembly Lube)

 C.
References

 (1)  
09-11-00/201, Towing

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

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

 (4)  
IPC 32-33-06 Fig. 1

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 32-33-06
 ALL  ú ú 01 Page 402 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
SEE A
UPLOCK-OPERATED SEQUENCE VALVE
SEE B
UPLOCK
MECHANISM
A
NOTE:THE BAR MUST BE BETWEEN
THE EDGES OF THE SLOT.

INT
UP DN
RET O
VALVE BRACKET  CT
ATTACH
C
BOLT
UPLOCK
MECHANISM

SEE C
ATTACH BOLT
ATTACH BOLT
(3 LOCATIONS)ROD
B
Body Landing Gear Uplock-Operated Sequence Valve Installation
Figure 401

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 32-33-06
 ALL  ú ú 01 Page 403 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

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

 E.
Procedure

 S 434-007
 (1)  
Install the hydraulic fittings in the sequence valve:

 (a)  
Lubricate the O-rings, the backup rings, and the fittings with Skydrol Assembly Lube.

 (b)  
Install the hydraulic fittings with the new O-rings and the backup rings in the ports of the sequence valve.

 S 424-017
 (2)  
Install the sequence valve (Fig. 401):

 (a)  
Put the sequence valve in its position.

 (b)  
Install the three attach bolts with thin washers adjacent to the bolt heads.

 (c)  
Connect the rod to the valve clevis with thin washers adjacent to the bolt head and the nut.

 (d)  
Install a nut and a cotter pin.

 (e)  
Push the rod against the valve spring until the holes in the rod end and the uplock mechanism align.

 (f)  
Connect the rod to the uplock mechanism: 1) Install the attach bolt with the thin washers adjacent to the bolt head. 2) Install the large steel washers on the two sides of the rod

 end bearing. 3) Install the nut and a cotter pin.

 (g)  
Make sure the uplock hook is in the open (gear down) position.

 (h)  
Make sure the bar on the valve slide is between the edges of the slot (detail C).

 NOTE: The slot is on the aft end of the valve.
____
 (i)  
Remove the caps and the plugs.

 (j)  
Connect the hydraulic lines to the valve.
　
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