(a)  
Disconnect hydraulic lines from the accumulator isolation valve.

 (b)  
Put caps or plugs on the hydraulic lines.

 (c)  
Remove the bolts and washers that attach the accumulator isolation valve to the mounting bracket.

 (d)  
Remove the accumulator isolation valve from the airplane.

 S 034-037
 (2)  
Remove the unions from the ports in the accumulator isolation valve.

 S 034-038

 (3)  
Discard the O-rings.

 S 494-039

 (4)
Put plugs in the ports of the accumulator isolation valve.

 TASK 32-41-08-404-009
 3.  Accumulator Isolation Valve Installation (Fig. 401)
________________________________________
 A.  Consumable Materials
 (1)  D00288 MCS 352 Lubricant
 NOTE: Use BMS 3-11 or MCS 352 to lubricate O-rings and fittings on
____
 the valve assembly.

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 ALL  ú ú 01 Page 404 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (2)  D00196 BMS 3-11 Hydraulic fluid
 NOTE: Use BMS 3-11 or MCS 352 to lubricate O-rings and fittings on
____
 the valve assembly.

 B.  References
 (1)  
AMM 12-12-01/301, Hydraulic Systems (Hydraulic Replenishing)

 (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)  
AIPC 32-41-08 Fig. 5

 C.  
Access

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

 D.  
Procedure

 S 434-040
 (1)  
Lubricate new O-rings, unions, and plug.

 S 434-041

 (2)  
Install the O-rings on the unions and plug.

 S 434-042

 (3)  
Install the unions and plug on the accumulator isolation valve. Torque the plug to 170 +/- 8 inch-pounds.

 S 424-012

 (4)  
Do these steps to install the accumulator isolation valve:

 (a)  
Put the accumulator isolation valve in its position on the mounting bracket and install three bolts with washers.

 (b)  
Connect hydraulic lines to the accumulator isolation valve.

 S 714-029
 (5) Do these steps to do a test of the accumulator isolation valve:
 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.
 (a)  Pressurize hydraulic system 1 (AMM 29-11-00/201).
 1)  Use a hydraulic service cart or the Air Driven Pump (ADP) for hydraulic system 1 to pressurize hydraulic system 1.
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 ALL  ú ú 04 Page 405 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b) With hydraulic system 1 pressurized for at least two minutes,
 do a check for leaks at the accumulator isolation valve.

 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.
 (c)  
Pressurize hydraulic system 4 (AMM 29-11-00/201).

 (d)  
With hydraulic system 4 pressurized for at least two minutes, do a check for leaks at the accumulator isolation valve.
　
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