1
ASSEMBLY

TORQUE TUBE
TORQUE TUBE FORWARD GEARBOX AND BRAKE ASSEMBLY
GEARBOX HUB
SEE C LIFT POWER UNIT
INDEX PIN 2
INDEX PIN 2 BOLT
BOLT TORQUE TUBE

(3 LOCATIONS)
(3 LOCATIONS)

FWD
A
THIS BOLT IS THROUGH THE POWER UNIT AND THE GEARBOX
1
2
AN INDEX PIN REPLACES THE BOLT AT THIS LOCATION.
THE PIN PREVENTS INSTALLATION OF THE GEARBOX AT THE INCORRECT LOCATION

Gearbox and Brake Assembly Installation
Figure 401 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

TORQUE
TORQUE  TUBE
ROTARY TUBETUBE ACTUATOR
GEARBOX AND BRAKE 
ASSEMBLY 
B  C 
AFT GEARBOX AND BRAKE ASSEMBLY  BOLT (2 LOCATIONS)  SPLINED  (2 LOCATIONS) BOLT  POWER  FORWARD GEARBOX 
FITTING  OR RIVET  UNIT  AND BRAKE ASSEMBLY 

COUPLING LIFT POWER UNIT TORQUE TUBE QUILL
D
UPSTOP CLEARANCE SHAFT
3E

ROTARY DOOR(AFTER ELECTRICAL ACTUATOR DOWN
OPERATION)  DOWNSTOP
STOP CLEARANCE
5
ROTARY DOOR ACTUATOR DOWN 3
DOOR SWITCH (AFTER ELECTRICALUP SWITCH OPERATION)
4
0.040
INCH
0.032 SWITCH CLEARANCE
7
0.071
INCH
0.063
SWITCH CLEARANCE
ACTUATOR

6
ACTUATOR ACTUATOR LINK ARM ARM
F
3 0.20 |0.01 INCH (SET MANUALLY)
4
0.06 TO 0.18 INCH (AFTER ELECTRICAL OPERATION STOPS)
5
0.09 TO 0.21 INCH (AFTER ELECTRICAL OPERATION STOPS)
6
SWITCH CLEARANCE WITH ACTUATOR LINK CLEARANCE SET MANUALLY
7
SWITCH CLEARANCE WITH DOWNSTOP CLEARANCE SET MANUALLY
Gearbox and Brake Assembly Installation
Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-006
 (3)  
Move the insulation that is necessary for access (25-21-04/401).

 S 034-026

 (4)  
Do these steps for the forward or the aft gearbox:

 (a)  
Remove the screws that are through the coupling at the torque tube on the rotary actuator (Detail B).

 NOTE: This is the torque tube that goes from the
____
 rotary actuator to the gearbox.

 (b)  
Slide the coupling over the torque tube (Detail B).

 (c)  
Pull the torque tube out of the gearbox.

 S 024-008
 (5)  
Remove the aft gearbox as follows:

 (a)  
Remove the two bolts that are through the coupling at the gearbox (Detail D).

 NOTE: This is on the torque tube that goes from the gearbox
____
 to the power unit.

 (b)  
Push the coupling over the torque tube (Detail D).

 (c)  
Pull the torque tube off the power unit.

 (d)  
Remove the bolts that attach the gearbox to the bracket.

 NOTE: Catch the washers as you remove the bolts.
____
 (e)  Pull the gearbox away from the bracket until it is clear of the remaining torque tube.
 NOTE: This is the torque tube that goes to the forward
____
 gearbox.

 (f)  Pull the torque tube out of the forward gearbox.
 S 024-009
 (6)  
Remove the forward gearbox as follows:

 (a)  
Remove the bolts which attach the gearbox to the bracket and the power unit (detail A).

 NOTE: Catch the washers as you remove the bolts.
____
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