32-21-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
747-400 
MAINTENANCE MANUAL 
SEE  B 
SEE  A  SEE  D 
TRUNNION 
BEARING (2) 
A 
DRAG STRUT  SEE  E 
SEE  C 
A 
TRIPOD APEX 
BULLNOSE 
ASSEMBLY 
CONNECTORS 
D2694  A 
D2693 
COVER  WALL OF THE 
AFT WHEEL WELL 
CONDUIT 
CLAMP 
B 
Nose Gear Installation 
Figure 402 (Sheet 1) 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
AFT DOOR OPERATOR ROD
BULKHEAD SUPPORT FITTING
DRIVE CRANK
TRUNNION BEARING CAP
BEARING CAP BOLTS
A 747-400 MAINTENANCE MANUAL
RETRACT ACTUATOR
ACTUATOR BOLT
TRUNNION CRANK ARM
TRUNNION
C
DRAG STRUT
UPPER DOWNLOCK LINK ASSEMBLY
GROUND LOCK
LOWER DOWNLOCK LINK ASSEMBLY
FWD D
Nose Gear Installation
Figure 402 (Sheet 2)

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A 747-400 MAINTENANCE MANUAL
BODY SUPPORT

DO NOT APPLY SEALANT TO INSIDE SURFACE OF TRUNNION BUSHING ASSEMBLY

Nose Gear Installation Figure 402 (Sheet 3)
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A
747-400 MAINTENANCE MANUAL
 S 034-020
 WARNING: MAKE SURE YOU HOLD THE TRIPOD BEFORE YOU REMOVE THE APEX PIN.
_______ THE TOP TRIPOD BRACE WEIGHS APPROXIMATELY 45 POUNDS. THE LOWER TRIPOD BRACE WEIGHS APPROXIMATELY 57 POUNDS. FAILURE TO HOLD THE TRIPOD WILL CAUSE THE TRIPOD TO FALL. IT CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Remove the tripod apex pin.

 (a)  
Remove the apex pin nut of the tripod.

 (b)  
Install the thread protector.

 (c)  
Adjust the forward caster jacks to release the pressure on the pin.

 (d)  
Remove the tripod apex pin.

 (e)  
Move the drag strut forward and insert the apex pin in the tripod assembly.

 (f)  
Hold the drag strut forward.

 S 034-021
 CAUTION: KEEP THE BEARINGS AND THE BEARING CAPS IN THE SETS.
_______ IF YOU USE THE INCORRECT SETS, YOU CAN CAUSE TOO MUCH WORN AREAS OR DAMAGE TO THE EQUIPMENT.
 (4)  
Remove the two bolts on each trunnion to remove the bearing caps from the trunnion fitting.

 (a)  
Make a mark on the bearings and the caps for installation.

 NOTE: Remove each side of the door opening below the trunnion
____ bearings to get access to the cap nuts. Remove the exterior skin panel approximately 5-1/2 x 17 to get to the fairing fasteners.
 S 024-022
 (5)  
Remove the nose landing gear.

 (a)  
Use the dolly caster jacks to lower the gear.

 WARNING: LOCK THE OUTBOARD CASTER JACKS WHEN YOU MOVE THE NOSE
_______ LANDING GEAR. DO NOT TOW THE NOSE LANDING GEAR MORE THAN 3 MILES PER HOUR. KEEP THE RADIUS OF TURNS TO 10 FEET MINIMUM TO PREVENT THE GEAR TO FALL. MOVE THE NOSE GEAR WITH THE WHEELS ON WHEN YOU USE THE DOLLY.
 (b)  Use the dolly to move the nose landing gear from the area.
 TASK 32-21-01-404-023
 3. Nose Landing Gear Installation
______________________________
 A. Special Tools and Equipment
　
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