747-400
MAINTENANCE MANUAL

SEE A
SIDE STRUT 
FRAME  SPINDLE SHOCK STRUT 
SEE  B 
ROLLER SUPPORT 
PUSHROD 
UPPER TORSION LINK  HOOK  LEVER 
A  FWD 

Wing Gear Truck Mechanical Lock
Figure 501

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E43845
A
747-400
MAINTENANCE MANUAL

 1)  Make sure that the angular travel in the retract direction is not more than 15 degrees.
 (f)  
Move the control lever to the DN position. 1) Make sure the main landing gear extend. 2) Make sure the main landing gear is in the down and locked

 position.

 (g)  
Move the control lever to the OFF position.

 S 865-102
 (22)
 Remove the pressure from hydraulic system No. 4 (AMM 29-11-00/201).

 H.  
Put the Airplane Back to Its Usual Condition.

 S 485-146
 (1)  
Install ground locks in all landing gear (AMM 09-11-00/201).

 S 585-141

 (2)  
Lower the airplane to the ground and remove the jacks
 (AMM 07-11-01/201).

 S 865-142

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7 Overhead Panel:
 1) 7A03 AURAL WARN L
 2) 7A04 AURAL WARN R

 (4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 865-143
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 WING LANDING GEAR ACTUATOR - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  This procedure contains these two tasks:
 (1)  
The removal of the actuator for the wing landing gear

 (2)  
The installation of the actuator for the wing landing gear.

 B.  
To remove the actuator these operations are necessary:

 (1)  
Disconnect the hydraulic hoses from the actuator.

 (2)  
Remove the walking beam for the wing landing gear.

 (3)  
Remove the bolt that attaches the walking beam to the hanger.

 (4)  
Remove the bolts that attach the actuator.

 (5)  
Use the hoist to remove the actuator.

 C.  
To install the actuator these operations are necessary:

 (1)  
Use the hoist to install the actuator.

 (2)  
Connect the head end of the actuator and the walking beam to the hanger.

 (3)  
Install the bolt that attaches the rod end of the actuator.

 (4)  
Connect the hydraulic hose to the actuator.

 (5)  
Do a check for leaks.

 D.  
The actuator for the wing landing gear is between the trunnion and the walking beam and the hanger. You must remove the walking beam before you remove the actuator. Because the actuator is very heavy, you must use a hoist adapter to remove it.

 TASK 32-32-01-004-001
 2.  Wing Landing Gear Actuator Removal__________________________________
 A.  Special Tools and Equipment
 (1)  
ME65B01570 Wing Gear Retract Actuator Sling

 (2)  
MIT65B01204-1 Wing Landing Gear Walking Beam Bolt Removal Tool

 (3)  
Pf51-009 - Fish Pole Hoist; PF Industries Inc., 3638 34th Avenue South, Seattle, Washington 98144

 (4)  
ST2580-263 Retract Actuator Spacer Nut Torque Wrench Adapter

 (5)  
10PRE65B00161-1 Actuator to Wing Gear Attachment Bolt Protective Equipment (Thread Protector)

 B.  
References

 (1)  
AMM 06-09-08/201, Wing Access Doors and Panels

 (2)  
AMM 09-11-00/201, Towing
　
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