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747-400 MAINTENANCE MANUAL
 S 866-020
 (12) Apply the power to PDU(s) and steering actuators as necessary.
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747-400
MAINTENANCE MANUAL

RETRACTABLE/STEERABLE PDU

A-A

VALVE STEM NUT SHALL BE TORQUED 45-50 IN. LBS, TIRE INFLATED TO 125-130 PSI.
TOP OF WHEEL SUPPORT PLATE
Retractable/Steerable PDU Inspection Figure 601 (Sheet 1)
E02244
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747-400
MAINTENANCE MANUAL

LIMIT
LIMIT SWITCH
SWITCH,
ELECTRICAL
S3

(EXAMPLE)
UNDERSIDE OF PDU

Retractable/Steerable PDU Inspecton
Figure 601 (Sheet 2)

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E02252
A 747-400 MAINTENANCE MANUAL
SUPPORT RING
FLOOR
NUTPLATE AND BEAM
NUTPLATE SPACER
STEERING ACTUATOR MOUNT
ALUMINUM SHIM
SHOULDER BOLT
FWD
STEERING ACTUATOR PDU
STEERING ACTUATOR PIVOT
D
PDU WHEEL
PDU ACTUATORELECTRICAL PDU WHEELCABLE SHIELD
RELAY
TO RELAY AND GROUND
TO PDU MOTOR INBD
PDU WIRE INSTALLATION (VIEW LOOKING UP)
Retractable PDU Component Location
Figure 601 (Sheet 3)

E02265
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747-400 MAINTENANCE MANUAL
 PDU STEERING ACTUATOR - REMOVAL/INSTALLATION
____________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. The first task gives instructions to remove the steering actuator for a steerable power drive unit (PDU). The second task gives instructions to install the steering actuator.
 B.  The actuator is below the PDU and attaches to the structure in the floor. This procedure is applicable to these steerable PDUs only:
 (1)  
PDU 23R

 (2)  
PDU 24

 TASK 25-57-02-004-009
 2.  PDU Steering Actuator Removal (Fig. 401)_____________________________
 A.  References
 (1)  AMM 25-57-01/401, Power Drive Units
 B.  Access
 (1)  Location Zone
 210 Main Deck

 C.  Procedure
 S 014-002
 (1)  
Remove the steerable PDU to get access to the actuator (AMM 25-57-01/401).

 S 034-003

 (2)
Disconnect the electrical connector plug from the actuator.
 ~....................................................
 | | STEERING | ELECTRICAL |
 | PDU | ACTUATOR | CONNECTOR |
 ......................................................
 | 23R | M337 | DM337 |
 ......................................................
 | 24 | M153 | DM153 |
 2..........…......................…..................1

 S 034-004

 (3)  
Remove the four nuts, washers, and bolts which attach the actuator to the structure.
　
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