25-57-10
 ALL  ú ú 05 Page 403 ú Oct 10/93
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A
747-400 MAINTENANCE MANUAL
 PDU DRIVE-WHEEL ASSEMBLY AND DRIVE-WHEEL ACTUATOR - REMOVAL/INSTALLATION
________________________________________________________________________
 1.  General_______
 A. This procedure has these tasks.
 (1)  
The removal of the drive-wheel assembly for nonretractable power drive units (PDUs)

 (2)  
The removal of the drive wheel actuator for nonretractable PDUs.

 (3)  
The installation of the drive-wheel assembly.

 (4)  
The installation of the drive-wheel actuator.

 TASK 25-57-11-004-001
 2.  PDU Drive-Wheel Assembly Removal (Fig. 401)________________________________
 A. References
 (1)  25-57-01/401, Power Drive Units
 B. Access
 (1)  Location Zone
 210 Main Deck

 C. Procedure
 S 014-002
 (1)  
Remove the power drive unit (PDU) (Ref 25-57-01/401).

 S 034-003

 (2)  
Loosen the axle bolt which attaches the drive-wheel axle to the actuator nut.

 NOTE:____The axle bolt is in the drive-wheel axle. A grip ring will prevent the removal of the axle bolt.
 S 034-012
 (3)  
Remove the four bolts (hex head) and washers from the bearing support assembly.

 S 034-013

 (4)  
Hold the drive-wheel assembly while you remove the drive-wheel axle and the bearing support assembly.

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 25-57-11
 ALL  ú ú 05 Page 401 ú Oct 18/00
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A 747-400 MAINTENANCE MANUAL
DRIVE WHEEL
TERMINAL RELAY AND  NONRETRACTABLE POWER DRIVE UNIT 
BLOCK 
A 
DRIVE WHEEL 
ACTUATOR 
ACTUATOR  DRIVE WHEEL 
WIRE BUNDLE  A  HOUSING 
DRIVE WHEEL 
DISENGAGE CABLE 

NONRETRACTABLE PDU (TYP)

DRIVE WHEEL 
PDU SUPPORT 
PLATE (REF)  HEX HEAD  2.87-2.93 
BOLT  INCHES  SERRATED MOUNTING 
(4 PLACES) SHIM  (2 PLACES) PLATE 

ACTUATOR WIRE HEX HEADBUNDLE TO RELAY BOLTAND TERMINAL ACTUATOR (4 PLACES)
BLOCK NUT BEARING SUPPORT DRIVE WHEEL AXLE
AXLE LOCKRING
SERRATED MEMORY PLATEDRIVE WHEEL (2 PLACES)DISENGAGE BOLT CABLE LOCKRING
DRIVE WHEEL SPLINES
ACTUATOR
AXLE BOLT
DRIVE WHEEL SHIELD A-A
PDU Drive Wheel and Wheel Actuator Installation Figure 401 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-57-11
 ALL  ú ú 01 Page 402 ú Feb 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

DESIGNATES WIRE SIZECONNECTOR

CASE GRD
NEUTRAL

A PHASE

B PHASE

C PHASE

R1
P2 P1
DRIVE WHEEL ACTUATOR ELECTRICAL HOOKUP

PDU Drive Wheel and Wheel Actuator Installation
Figure 401 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-57-11
 ALL  ú ú 01 Page 403 ú Feb 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-014
 (5)  Remove the drive-wheel assembly.
 TASK 25-57-11-004-015
　
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