(2)
PDU 3

 (3)
PDU 4L

 (4)
PDU 4R

 (5)
PDU 5L

 (6)
PDU 5R

 (7)
PDU 6L

 (8)
PDU 6R

 (9)
PDU 7L

 (10)
 PDU 7R

 (11)
 PDU 23R

 (12)
 PDU 24

 F.  When you install the electrically steerable PDUs, make sure the PDUs align in the steering angle as follows:
 (1)
PDU 2 0 degrees

 (2)
PDU 3 0 degrees

 (3)
PDU 4L 0 degrees

 (4)
PDU 4R 0 degrees

 (5)
PDU 5L 0 degrees

 (6)
PDU 5R 0 degrees

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747-400
MAINTENANCE MANUAL

 (7)
PDU 6L 4 degrees clockwise

 (8)
PDU 6R 4 degrees counter clockwise

 (9)
PDU 7L 4 degrees clockwise

 (10)
 PDU 7R 4 degrees counter clockwise

 (11)
 PDU 23R 8 degrees clockwise

 (12)
 PDU 24 18 degrees counter clockwise

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747-400 MAINTENANCE MANUAL
SEEC  SEEC
6R 7R 17R 18R5R
23R 123 19
4R
4L 5L 17L6L 7L 18L
SEE A
RED TRIGGER
DRIVE-WHEEL
FLAG

SEE B
PDU HANDLE
DRIVE-WHEEL
PDU ARROW
ACTUATOR

INDICATOR
LOCKPIN
PDU ELECTRICAL
CONNECTOR

DRIVE-WHEEL
DISENGAGE DRIVE-WHEEL DISENGAGE
CABLE SERRATED CABLE STOWAGE FITTING

INDEX BLOCK  (UNDER FLOOR)
INDEX 1 PLATE DRIVE-WHEEL ACTUATOR DRIVE-WHEEL NONSTEERABLE PDU DISENGAGE HANDLE
(FIXED AND MANUALLY ADJUSTABLE)
PDU TORQUE REACTION
A
FITTING (2 LOCATIONS)
STEERING
ACTUATOR

SINGLE STUD DUMMY CONNECTOR
(DOUBLE STUD ON AND COVER
OTHER FITTING) (3 LOCATIONS)
ELECTRICAL CONNECTOR LOCK BOLT
STUD FITTING (2 LOCATIONS) ELECTRICAL
PLUG (P1)
WIRE BUNDLE FOR CONNECTOR
DRIVE-WHEEL ACUATOR PLUG (P3) WIRE BUNDLE FOR ELECTRICAL
STEERING ACTUATOR CONNECTOR PLUG (P2) FWD
ANTI-ROTATION WIRE BUNDLE FOR SUPPORT FITTING LIMIT SWITCHES (2 LOCATIONS)
LEGEND
RETRACTABLE/STEERABLE PDU INBD NONSTEERABLE PDU
B
RETRACTABLE/STEERABLE PDU
MANUALLY ADJUSTABLE PDU ONLY
Power Drive Unit Installation
Figure 401 (Sheet 1)

L46841
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747-400
MAINTENANCE MANUAL

POWER DRIVE UNIT

TRAY MOUNTED PDU

Power Drive Unit Installation
Figure 401 (Sheet 2)

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L46791
A
747-400 MAINTENANCE MANUAL
 TASK 25-57-01-004-078
 2. Power Drive Units Removal (Fig. 401)
_________________________
 A. References
 (1)  
AMM 25-57-04/401, Caster and Roller Trays

 (2)  
AMM 25-58-01/401, Lock/Stop Roller and Caster Trays
　
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