S 435-327

 (7)  
Adjust the serrated memory plate on the bearing support side of the PDU.

 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.
 S 435-071
 (8)  
Tighten the two phillips head bolts on the bearing support side of the PDU to hold the adjustment.

 S 435-072

 (9)  
Tighten the four hex head bolts on the side of the PDU with the drive wheel actuator to 126-154 pound-inches.

 S 435-073

 (10)
 Tighten the four hex head bolts on the bearing support side of the PDU to 63-77 pound-inches.

 S 425-074

 (11)
 Install the PDU in the floor (Ref 25-57-01/401).

 F. Floor Mounted Steerable PDU Limit Switches Adjustment (Fig. 503)
 S 025-089
 (1)  
Remove the PDU from the floor (Ref 25-57-01/401).

 S 225-090

 (2)  
Make sure the PDU limit switches are along the PDU support fitting in the floor at the angular positions that follow:

 (a)  
PDU 2 1) Limit switch S1: 16-degrees counterclockwise 2) Limit switch S2: 9-degrees counterclockwise 3) Limit switch S3: 0-degree 4) Limit switch S4: 9-degrees clockwise

 (b)  
PDU 3 1) Limit switch S1: 25-degrees counterclockwise 2) Limit switch S2: 18-degrees counterclockwise 3) Limit switch S3: 0-degree 4) Limit switch S4: 18-degrees clockwise

 (c)  
PDU 6L
 1) Limit switch S1: 1-degree clockwise
 2) Limit switch S2: 7-degrees clockwise

 (d)  
PDU 6R 1) Limit switch S1: 7-degrees counterclockwise

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-57-00
 ALL  ú ú 15A Page 529 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

DRIVE WHEEL
ACTUATOR

PHILLIPS HEAD BOLT
A
(2 LOCATIONS EACH SIDE)
DRIVE WHEEL
ASSEMBLY
NONRETRACTABLE
POWER DRIVE UNIT A
(EXAMPLE)
SERRATED MEMORY
PLATE
HEX HEAD BOLT
(4 LOCATIONS EACH SIDE)
NONRETRACTABLE PDUs

SERRATED MOUNTING PLATE
SERRATEDMEMORY PLATE
SHIM
HEX HEAD BOLT (4 LOCATIONS EACH SIDE) DRIVE WHEEL ACTUATOR
A-A
DRIVE WHEEL ASSEMBLY
2.90 |0.03 INCHES
SERRATED
MOUNTING PLATE BEARING SUPPORT
DRIVE WHEEL AXLE
SERRATED MEMORY PLATE
Nonretractable PDU Drive Wheel Height Adjustment
Figure 502

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 2)  Limit switch S2: 1-degree counterclockwise
 (e)  
PDU 7L
 1) Limit switch S1: 0-degree
 2) Limit switch S2: 8-degrees clockwise

 (f)  
PDU 7R
 1) Limit switch S1: 8-degrees counterclockwise
 2) Limit switch S2: 0-degree

 (g)  
PDU 23R
 1) Limit switch S1: 3.8-degrees clockwise
 2) Limit switch S2: 13-degrees clockwise

 (h)  
PDU 24
 1) Limit switch S1: 16-degrees clockwise
 2) Limit switch S2: 22-degrees clockwise

 S 735-091
 (3)  If it is necessary, adjust the angular position of the limit switch as follows:
 (a)
Loosen, but do not remove, the two switch holder screws.

 (b)
Move the limit switches to the angular positions that follow:

 1)  PDU 2 a) Limit switch S1: 16-degrees counterclockwise b) Limit switch S2: 9-degrees counterclockwise c) Limit switch S3: 0-degree d) Limit switch S4: 9-degrees clockwise
 2)  PDU 3 a) Limit switch S1: 25-degrees counterclockwise b) Limit switch S2: 18-degrees counterclockwise c) Limit switch S3: 0-degree d) Limit switch S4: 18-degrees clockwise
　
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