747-400 MAINTENANCE MANUAL
HANDLE (2 LOCATIONS)WHEEL
TORQUE REACTION FITTING (2 LOCATIONS)
UNDERSIDE OF PDU
SEE A
RETRACTABLE/STEERABLE PDU
LIMITLIMIT SWITCH SWITCH,ELECTRICAL S3CONNECTOR
ROTARY STEERING
ROTARY STEERING ACTUATOR
ACTUATOR ELECTRICAL
CONNECTOR
LIMIT
SWITCH,
S1
ROTARY DRIVE ACTUATOR
RELAY ELECTRICAL
CONNECTOR

MANUAL
ROTARY DRIVE RETRACTION
ACTUATOR MANUAL DRIVE SOCKET
DISENGAGE HANDLE ROTARY DRIVE LIMIT ACTUATOR SWITCH, S2
RELAY (EXAMPLE)
UNDERSIDE OF PDU
A
Retractable/Steerable PDU Manual Retraction
Figure 202

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A

747-400
MAINTENANCE MANUAL

ROTORY
PDU
STEERING
HOUSING

S2  S2 
PDU 17L  PDU 18L 
S1 

S2
PDU 19L1
PDU LIMIT SWITCH FUNCTION
SWITCH NO. S3 S2 S1  POSITION DRIVE WHEEL 0` (FORE-AFT DRIVE) 45` (RETRACTED) 90` (LATERAL DRIVE) 

RETRACTABLE/STEERABLE
PDU LIMIT SWITCH LOCATIONS

Retractable/Steerable PDU Limit Switch Deactivation
Figure 203 (Sheet 1)

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747-400
MAINTENANCE MANUAL

PDU HOUSING

Retractable/Steerable PDU Limit Switch Deactivation
Figure 203 (Sheet 2)

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E54717
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747-400
MAINTENANCE MANUAL

1
2
3
4L 4R
5L 5R
6L 6R
7L 7R
PDU
8L 8R

(REMOVED FOR CLARITY)
9L 9R
DRIVE WHEEL DISENGAGE CONTROL HANDLE10L 10R
DRIVE WHEEL
ACTUATOR
11L 11R

12L 12R
DRIVE WHEEL

13L 13R  STEERING
ACTUATOR

14L 14R
15L 15R
16L 16R
17L 17R
18L 18R
19L 19R
DRIVE-WHEEL DISENGAGE 20L 20R CONTROL HANDLE DRIVE-WHEEL DISENGAGE (EXAMPLE)
21L 21R CONTROL HANDLE
A
SEE A
22L 22R

23L 23R
24
Power Drive Unit and Disengage Controls
Figure 204

K24260
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747-400 MAINTENANCE MANUAL
 POWER DRIVE UNITS - REMOVAL/INSTALLATION
________________________________________
 1.  General_______
 A.  This procedure has these tasks.
 (1)
The removal of the power drive units (PDUs)

 (2)
The installation of the power drive units (PDUs)

 B. The instructions in this procedure are applicable to these types of PDUs:
 (1)
Retractable/Steerable PDUs

 (2)
Nonsteerable PDUs

 (3)
Electrically Steerable PDUs

 (4)
Tray Mounted PDUs

 C.  There are two types of nonsteerable PDUs: fixed and manually adjustable.
 D.  There are two types of electrically steerable PDUs: one type has the disengage cable, and the other type is without the disengage cable.
　
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