S 215-340

 (42)
 Make sure PDUs 19L1, 19L2, 19R1 and 19R2 start to turn in the inboard direction after PDUs 19L1 and 19L2 reach the 90-degree lateral position.

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 S 715-341
 (43) Release the DRIVE CONTROL switch to the OFF position and make sure the PDUs do not continue to turn.
 NOTE: PDU 19L1 completes its steering cycle before PDU 19L2
____
 starts its cycle.

 S 715-061
 (44)
 At the master cargo control panel, M1, push the REMOTE CONTROL ON/OFF switch.

 S 215-342

 (45)
 Make sure that these conditions occur:

 -
The OFF switch light comes on

 -
The CONTROL ACTIVE light is not on

 -
The LEFT ENTRY DRIVE UNITS ON switch is not on

 -
The RIGHT SIDE MAIN DRIVE SELECT OFF switch is not on.

 L. Put the Airplane back to its Usual Condition
 S 715-384
 (1) On the master cargo control panel, do the steps that follow:
 (a)  
Push STOP switch.

 (b)  
Push ZONE SELECT CANCEL switch.

 S 715-062
 (2)  
At the master cargo control panel, M1, push each LEFT and RIGHT SIDE ENTRY DRIVE UNITS ON/OFF switch.

 S 215-343

 (3)  
Make sure the OFF switch light comes on.

 S 865-063

 (4)  
Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

 TASK 25-57-00-705-064
 3. Adjustment - Main Deck Cargo Drive System
_________________________________________
 A. General
 (1)  The adjustments that follow are for the floor mounted main deck PDUs.
 (a)  PDU Drive Wheel Height Adjustment
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747-400 MAINTENANCE MANUAL
 (b)  Steerable PDU 23R and 24 Limit Switches Adjustment (Fig. 504)
 B. Special Tools and Equipment
 (1) 5TE65B63076 Steerable PDU 23R and 24 Simulator Test Equipment
 C. Access
 (1)  Location Zone
 210 Main Deck

 D. References
 (1)  
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (2)  
25-57-01/401, Power Drive Units

 (3)  
53-21-02/401, Main and Upper Deck Floor

 E. PDU Drive Wheel Height Adjustment (Fig. 502)
 S 025-065
 (1)  
Remove the PDU from the floor (Ref 25-57-01/401).

 S 785-066

 (2)  
Make sure the tire pressure for the PDU drive wheel is 125-130 psig.

 S 225-345

 (3)  
Make sure the valve stem nut on the drive wheel is 45-50
 pound-inches before you adjust the drive wheel height.

 S 035-067

 (4)  
Loosen, but do not remove, the four hex head and two phillips head height adjustment bolts that hold the serrated memory plate on each side of the PDU.

 S 735-068

 (5)  
Adjust the serrated memory plate on the side of the PDU with the actuator.

 NOTE: The drive wheel height is 2.87-2.93 inches from the top
____ of the PDU support plate to the top of the tire at the minimum tire radius.
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 (6)  
　
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