TASK 52-32-02-004-001
 2. Remove the Lift Power Unit (Fig.__________________________401)
 A. References
 (1)  
25-21-04/401, Sidewall and Ceiling Insulation

 (2)  
IPC 52-32-02 Fig 2

 (3)  
SSM 52-32-01

 (4)  
WDM 52-32-11, 52-32-12

 B.
Access

 (1)  
Location Zone
 261 Main Deck STA 1720 To STA 2040

 (2)  
Access Panels
 836L Door - Main Deck Cargo

 C.
Procedure

 S 864-002
 (1)  
Open these circuit breakers for the side cargo door:

 (a)  
P415 Power Distribution Center - Right 1) 415F17 SIDE CARGO DOOR CONT

 (b)  
P715 Aux/Ext No. 2 Power Center
 1) SIDE CARGO DOOR PWR

 S 864-014
 (2)  
Move the insulation that is necessary to get access to the power unit (Ref 25-21-04/401).

 S 024-003

 (3)  
Remove the lift power unit.

 (a)  
Remove electrical connector DX209 from the power unit.

 (b)  
Remove the four screws that attach the manual drive gearbox to the structure (Detail B).

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A
747-400
MAINTENANCE MANUAL

LIFT MECHANISM POWER UNIT AND GEARBOXES
SEE A
FWD
ELECTRICAL 
CONNECTOR  SCREW SUPPORT BRACKET  SEE  B  POWER UNIT BOLT (4 LOCATIONS) 
BRACKET 

SEE D
TORQUE TUBE
AFT GEARBOX AND BRAKE
1
ASSEMBLY
TORQUE TUBE
COUPLING
SEE C FORWARD GEARBOX AND BRACKET BRAKE ASSEMBLY LIFT POWER UNIT TORQUE TUBE
FWD
LIFT MECHANISM POWER UNIT AND GEARBOXES A
THIS BOLT IS THROUGH THE POWER UNIT AND THE GEARBOX
1
Lift Power Unit 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

LIFT 
POWER 
UNIT 
THE QUILL SHAFT 
IS AT THE OTHER 
END OF THIS SHAFT 

(4 LOCATIONS) SCREW 
GEARBOX MANUAL DRIVE 
B  UNIT LIFT POWER  AND BRAKE ASSEMBLY FORWARD GEARBOX 
ASSEMBLY AND BRAKE AFT GEARBOX  SPLINED BOLT COUPLING FITTING (2 LOCATIONS)  BOLT (2 LOCATIONS) OR RIVET  SHAFT QUILL 

D TORQUE TUBEC
Lift Power Unit Installation
Figure 401 (Sheet 2)

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A
747-400
MAINTENANCE MANUAL

 (c)  
Pull the manual drive gearbox and quill shaft away from the structure.

 (d)  
Remove the bolt in the splined fitting that goes through the coupling at the aft end of the torque tube (Detail C).

 (e)  
Remove the bolt that goes through the coupling and the aft gearbox and brake assembly (Detail C).

 (f)  
Move the coupling over the splined fitting.

 (g)  
Remove the torque tube.

 (h)  
Remove the four bolts that attach the forward flange of the power unit to the structure.

 NOTE: Two of these bolts go through the forward gearbox
____ and brake also. Catch the washers as you remove the bolts.
 (i)  
Hold the power unit and remove the screw that attaches it to the support bracket.

 (j)  
Keep the shim if it is installed.
　
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