B.  
Access

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

 C.  
Prepare for the Removal

 S 864-021
 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 494-022
 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.
 (2)  Do this task: "Installation of the Door Locks on the Wing Landing Gear" (Ref 32-00-30/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

THE RIGHT SIDE IS SHOWN. THE LEFT SIDE IS OPPOSITE
Wing Gear Truck Positioner Pressure Reducing Valve Figure 401
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 ALL  ú ú 01 Page 402 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (3)  S 494-023Do this task: "Installation of the Door Locks on the Body Landing Gear" (Ref 32-00-30/201).
 (4)  S 844-004Release the pressure from the hydraulic system No. 4 (Ref 29-11-00/201).
 S 844-005

 WARNING: RELEASE THE PRESSURE FROM THE ACTUATOR AND THE LINES BEFORE YOU
_______ DISCONNECT THE LINES TO THE PRESSURE VALVE. THE REMAINING PRESSURE CAN CAUSE INJURY TO PERSONS.
 (5)  
Open the bleed valve on the actuator to release the pressure from the truck positioning actuator and the lines (Ref 32-11-20/401).

 D.
Procedure

 S 034-006
 (1)  
Disconnect and seal the hydraulic lines from the valve.

 S 034-007

 (2)  
Hold the valve and remove the three bolts.

 S 024-008

 (3)  
Remove the valve.

 S 034-009

 (4)  
If the hydraulic fittings are necessary for the replacement valve, remove the hydraulic fittings from the valve.

 (a)  
Seal the valve ports or put a cap on the hydraulic fittings.

 TASK 32-11-24-404-010
 3. Wing Gear Truck Positioner Pressure________________________________________________________Valve Installation
 A. Consumable Materials
 (1)  C00272 Skydrol Assembly Lube - MSC 352 or Hydraulic Fluid, Fire Resistant, BMS 3-11
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 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)  
32-11-20/401, Wing Gear Truck Positioning Actuator

 (5)  
IPC 32-11-24 Fig. 5

 C.
Access

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

 D.
Procedure

 S 434-013
 (1)  
For the replacement valve, install the hydraulic fittings in the valve ports with the new O-rings, the gaskets, and the backup rings.

 S 644-014

 (2)  
Lubricate the O-rings, the gaskets and the backup rings with the assembly lubricant or the hydraulic fluid during the installation.
　
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