57-43-00
 ALL  ú ú 01 Page 5 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 WING GEAR FORWARD TRUNNION BEARING HOUSING - REMOVAL/INSTALLATION
_________________________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the housing for the forward trunnion bearing of the wing gear. The second task is the installation of the housing for the forward trunnion bearing of the wing gear.
 (1)  
To remove the housing, do these steps:

 -
Remove the trunnion fork to the wing gear

 -
Remove the housing

 (2)  
To install the housing, do these steps:

 -Get the shims
 -Install the housing
 -Examine the space between the housing and the bearing plate
 TASK 57-43-01-004-001
 2.  Bearing Housing Removal_______________________
 A.  Special Tools and Equipment
 (1) ST921E - Wing Landing Gear Bearing Housing Shear Pin Puller
 B.  References
 (1)  
32-11-19/401, Trunnion Fork

 (2)  
IPC 57-11-53 Fig. 1

 C.  Access
 (1)  Location Zone 571 Rear Spar To Landing Gear Support Beam, Left 671 Rear Spar to Landing Gear Support Beam, Right
 D.  Procedure
 S 034-002
 (1)
Remove the trunnion fork of the wing gear (Ref 32-11-19/401).

 S 024-003

 (2)  
Remove the housing

 (a)  
Remove the lockbolts (4) (Fig. 401) from the bearing housing pins (2) and (3) at the top and bottom.

 (b)  
Remove the inboard pins.

 (c)  
Use the puller to remove the outboard pins that you cannot easily get to.

 (d)  
When you remove the outboard pins, remove the shims (5).

 (e)  
Remove the bearing housing (1) from the airplane structure.

 TASK 57-43-01-404-004
 3.  Bearing Housing Installation (Fig. 401)____________________________
 A.  Consumable Materials
 (1)  D00013 Grease - MIL-G-23827
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 57-43-01
 ALL  ú ú 01 Page 401 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
WING REAR SPAR
SEE A
1.  BEARING HOUSING
AIRPLANE STRUCTURE
5.  SHIM
2.  UPPER BEARING HOUSING PIN
SEE B
4.  LOCKBOLT (4 LOCATIONS)
BEARING PLATE
3.  LOWER BEARING HOUSING PIN INBD
BEARING
AIRPLANE HOUSING
STRUCTURE
A
AA
UP  UP
SHIM 
B  B 
AIRPLANE  BUSHING 
STRUCTURE  BUSHING 

BEARING HOUSING BEARING PLATE
0.015 INCH MAXIMUM
AIRPLANE CLEARANCE BETWEEN THE
STRUCTURE BEARING HOUSING BUSHING
B
AND THE BUSHING IN THE INBD AIRPLANE STRUCTURE
A-A INBD (4 LOCATIONS)
BEARING HOUSING BEARING PLATE
WHEN THE HOUSING AND BEARING PLATE TOUCH, THE MAXIMUM PERMITTED CLEARANCE BETWEEN THE PARTS IS 0.010 INCH
B-B Wing Gear Forward Trunnion Bearing Housing Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 57-43-01
 ALL  ú ú 01 Page 402 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. References
 (1)  
32-11-19/401, Trunnion Fork

 (2)  
IPC 57-11-06 Fig. 1

 C. Access
 (1)  Location Zone
 571 Rear Spar To Landing Gear Support Beam, Left
 671 Rear Spar to Landing Gear Support Beam, Right

 D. Procedure
 S 224-005
 (1)  Get the Shims
 (a)  Install the housing (1) in the structure.
 NOTE: The inboard surface of the housing must touch the
　
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