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
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
25-57-00
ALL ú ú 15A Page 530 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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