(a)  
Disconnect the hydraulic lines (2 locations) from the relief valve.

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747-400 MAINTENANCE MANUAL
 (b)  
Remove the two bolts and washers.

 (c)  
Remove the adapter fittings from the relief valve.

 (d)  
Discard the O-rings.

 S 034-043
 (2)  
Do the steps that follow to remove the internal relief valve, or the thermal relief valve cartridge:

 (a)  
Remove the lockwire.

 (b)  
Turn the cartridge counterclockwise to remove it from the valve assembly.

 (c)  
Discard the O-rings.

 TASK 32-44-09-404-056
 3. Thermal Pressure Relief Valve Installation (Fig. 401)
__________________________________________
 A. Consumable Materials
 (1)  
D00288 Lubricant - MCS 352

 B.
References

 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 32-00-30/201, Landing Gear Door Locks

 (5)  
IPC 32-44-04 Fig. 1

 C.
Access

 (1)  
Location Zone
 138 Body Landing Gear Well - Right

 D.
Prepare for the Installation

 S 494-057
 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 (AMM 09-11-00/201).
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MAINTENANCE MANUAL

 S 494-058
 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" (AMM 32-00-30/201).

 E.
Procedure

 S 424-065
 (1)  
For external thermal relief valves, do the steps that follow to install the relief valve:

 (a)  
Lubricate new O-rings and backup rings.

 (b)  
Install the adapters (2 locations) with the O-rings (2 on each adapter) and the backup ring (1 on each adapter) in the relief valve.

 (c)  
Hold the relief valve in its position on the mounting bracket.

 (d)  
Install 2 bolts and washers through the relief valve.

 (e)  
Connect the hydraulic lines to the relief valve assembly (2 locations).

 S 434-052
 (2)  
Do the steps that follow to install the internal relief valve, or the thermal relief valve cartridge:

 (a)  
Install O-rings (2 locations) and backup rings (4 locations) on the cartridge.

 (b)  
Install the cartridge in the relief valve.

 (c)  
Install a lockwire to the cartridge and the housing of the valve.

 S 864-038
 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.
 (3)  
Pressurize hydraulic system 4 (AMM 29-11-00/201).

 (4)  
Push the brake pedals to the stops five times.

 S 864-021
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