C. Procedure
S 014-017
(1)
Remove the power drive unit (PDU) (Ref 25-57-01/401).
S 034-018
(2)
Loosen the axle bolt which attaches the drive-wheel axle to the actuator nut.
NOTE:____The axle bolt is in the drive-wheel axle. A grip ring will prevent the removal of the axle bolt.
S 034-016
(3)
Disconnect the actuator wire bundle from the relay and the terminal block on the side of the drive-wheel housing.
S 034-019
(4)
Remove the four bolts (hex head) and washers which hold the actuator to the side of the drive-wheel housing.
(5)
Remove the actuator.
S 024-020
NOTE: There will be a shim between the actuator and the side of the
____
drive-wheel housing.
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25-57-11
ALL ú ú 04 Page 404 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TASK 25-57-11-404-006
4. PDU Drive-Wheel Assembly Installation (Fig. 401)_____________________________________
A. References
(1)
25-57-00/501, Main Deck Cargo Handling System
(2)
25-57-01/401, Power Drive Units
B. Access
(1) Location Zone
210 Main Deck
C. Procedure
S 784-021
(1)
Inflate the drive-wheel tire to a pressure of 125 to 130 psig.
S 424-022
(2)
Put the drive-wheel assembly into the drive-wheel housing.
S 434-023
(3)
Align the splines of the drive-wheel axle with the splines of the drive-wheel assembly.
S 434-024
(4)
Push the drive-wheel axle and the bearing support assembly through the side of the drive-wheel housing and assembly.
S 434-025
(5)
Move the drive-wheel assembly until the splines of the drive-wheel axle engage with the splines of the drive-wheel actuator.
S 434-026
(6)
Install the four washers and bolts (hex head) to attach the bearing support assembly to the side of the drive-wheel housing.
NOTE: Tighten the bolts to 63-77 inch-pounds.
____
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25-57-11
ALL ú ú 04 Page 405 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 434-009
(7) Attach the axle bolt to the actuator nut.
NOTE:____The axle bolt is in the drive-wheel axle. Tighten the axle bolt to 126-154 inch-pounds.
S 224-010
(8) Measure the height of the drive-wheel tire above the surface of the PDU support plate.
NOTE: The height of the drive-wheel tire must be 2.87-2.93 inches.
____
S 824-027
(9)
Adjust the height of the drive-wheel tire if it is necessary (Ref 25-57-00/501).
S 414-011
(10)
Install the power drive unit (PDU) in the floor (Ref 25-57-01/401).
TASK 25-57-11-404-034
5. PDU Drive-Wheel Actuator Installation (Fig. 401)_____________________________________
A. References
(1) 25-57-01/401, Power Drive Units
B. Access
(1) Location Zone
210 Main Deck
C. Procedure
S 424-028
(1)
Put the shim and the actuator in its position on the side of the drive-wheel housing.
S 434-029
(2)
Move the actuator until the splines of the actuator engage with the splines of the drive-wheel axle.
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