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A
747-400 MAINTENANCE MANUAL
 (b)  
P129, Main Deck Cargo Handling Power Panel 1) PDU 17R & 18R & STEERING

 (c)  
P130, Main Deck Cargo Handling Power Panel 1) PDU 19R1 & 19R2 & STEERING

 (d)  
P134, Main Deck Cargo Handling Power Panel 1) PDU 17L & 18L & STEERING

 (e)  
P135, Main Deck Cargo Handling Power Panel 1) PDU 19L1 & 19L2 & STEERING 2) MAIN DECK CARGO HANDLING CONTROL

 S 034-088
 (2)  Turn the two lockbolts on each torque-reaction fitting until the slot in the lockbolt points forward.
 S 024-089
 CAUTION:_______BE CAREFUL WHEN YOU REMOVE THE PDU. THE PDU WEIGHS APPROXIMATELY 85 POUNDS. YOU WILL CAUSE DAMAGE TO THE ACTUATORS AND THE LIMIT SWITCHES IF YOU ARE NOT VERY CAREFUL.
 (3)  
Lift the PDU to remove it from the support fittings.

 S 034-091

 (4)  
Disconnect the three electrical connector plugs (P1, P2, and P3) from the electrical receptacles on the support structure (WDM 25-57-23 and WDM 25-57-24).

 NOTE:____ The P1 connector plug is for the drive-wheel actuator.  The
 P2 connector plug is for the limit switches.  The P3
 connector plug is for the steering actuator.  If it is

 necessary, remove the dust cap from the dummy receptacles on the support structure and install them to the electrical receptacles.
 S 434-092
 (5)  Install a cover for the PDU wheel well in the floor if it is necessary.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 F. Remove the Electrically Steerable PDUs
 S 864-153
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P415, Power Distribution Center Right Panel
 1) 415F18, CARGO HANDLING CONT MAIN DECK

 (b)  
P34, Main Deck Cargo Handling Power Panel
 1) PDU 1 & 2 STEERING 2
 2) PDU 3 & STEERING
 3) PDU 4L & 4R STEERING
 4) MAIN DECK CARGO HANDLING CONTROL

 (c)  
P128, Main Deck Cargo Handling Power Panel
 1) PDU 5R & 6R & STEERING
 2) PDU 7R & 8R STEERING 7R
 3) MAIN DECK CARGO HANDLING CONTROL

 (d)  
P130, Main Deck Cargo Handling Power Panel
 1) PDU 22R & 23R STEERING 23R
 2) PDU 24 & STEERING

 (e)  
P133, Main Deck Cargo Handling Power Panel
 1) PDU 5L & 6L & STEERING
 2) PDU 7L & 8L STEERING 7L
 3) MAIN DECK CARGO HANDLING CONTROL

 S 014-094
 (2)  
Remove the caster trays or lock/stop roller and caster tray to get access to the PDU (AMM 25-57-04/401 or AMM 25-58-01/401).

 S 034-155

 (3)  
ALL PDU'S EXCEPT 4 AND 5, LEFT AND RIGHT; Lift the trigger mechanism below each handle on the PDU to release the PDU from the support fitting.

 NOTE: The PDU will release when the red indicator flag on each
____ trigger mechanism extends above the handles.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-57-01
 ALL  ú ú 11A Page 409 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-096
 CAUTION: BE CAREFUL WHEN YOU REMOVE THE PDU FROM THE SUPPORT FITTING.
_______ DAMAGE COULD OCCUR TO THE GEARS, LIMIT SWITCHES, AND DRAIN GUTTER.
 (4)  
　
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