32-32-95
 ú ú 02 Page 405 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 MAIN GEAR ISOLATION VALVE - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  Two isolation valves are in the wheel well of the left main gear in the modular package for the isolation valves. The valves are same. The subsequent procedure gives the removal and the installation instructions for the two valves.
 TASK 32-32-97-004-001
 2.  Main Gear Isolation Valve Removal (Fig. 401)_________________________________
 A.  Equipment
 (1)  
Ground Lock Assemblies (AMM 32-00-01)

 B.  
Procedure

 S 864-002
 (1)  
Make sure that you install the ground lock assemblies for the landing gear in all gears (AMM 32-00-01).

 (a)  
Decrease the pressure from the hydraulic system A (AMM 29-15-00, MP).

 (b)  
Remove the handle stop bracket.

 (c)  
Remove the mounting bolts and the isolation valve.

 (d)  
Put plugs on the valve ports in the modular package.

 TASK 32-32-97-404-003
 3.  Main Gear Isolation Valve Installation (Fig. 401)______________________________________
 NOTE:____Do not change the Ronson and Whittaker valve handles. If you change the valve handles on the valve, the handle position will not agree with the valve position. The leak of the hydraulic power will occur.
 A.  Consumable Material
 (1)  
Hydraulic Fluid - BMS 3-11 (AMM 20-30-21)

 B.  
Procedure

 S 644-004
 (1)  Lubricate the packings lightly with the assembly lubrication or hydraulic fluid.
 NOTE: Install the packings on the valve.
____
 (a)  
Remove the plug in the modular package for the isolation valves.

 (b)  
Put the valve in the modular package.

 NOTE: Install the mounting bolts.
____
 (c) Pressurize the hydraulic system (AMM 29-15-00, MP).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ISOLATION VALVES ú

 32-32-97
 ú ú 01 Page 401 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
MODULAR PACKAGE FOR
THE ISOLATION VALVE

SEE  A 
GEAR VALVE RIGHT MAIN SEE B 
LEFT MAIN GEAR VALVE SEE B 
HANDLE STOP BRACKET 
FWD  VALVE MOUNTING BRACKET  BRACKET MOUNTING BOLT (3 LOCATIONS) 
INBD  A 

MAIN GEAR VALVE
BACK-UP RING (4 LOCATIONS)  MOUNTING BOLT (4 LOCATIONS) 
PACKING (2 LOCATIONS)  B 
Figure 401 Main Gear Isolation Valves Installation 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ISOLATION VALVES ú

 32-32-97
 ú ú 01 Page 402 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (d)  Open and close the valve.
 NOTE: Do a check for the hydraulic leaks.
____
 (e)  Turn off the hydraulic power.
 TASK 32-32-97-714-007
 4. Operational Check
__________________
 A. Equipment
 (1)  
Ground Lock Assemblies (AMM 32-00-01)

 B.
Procedure

 S 714-008
 (1)  
Use this operational check only when it is not possible to lift the airplane with the jacks.

 (a)  
Do a check of the isolation valve operation

 (b)  
Make sure you install the ground lock assemblies in the main and nose landing gear (AMM 32-00-01).

 (c)  
Close the isolation valves.

 (d)  
Pressurize the hydraulic system A.

 (e)  
Feel the down line hoses from the uplock and downlock actuators for the main landing gear.

 (f)  
Move the control lever for the landing gear to OFF.
　
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