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28-22-03
ALL ú ú 03 Page 403 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
E. Motor/Impeller Unit Removal
S 034-010
(1) Remove the electrical connector from the motor/impeller unit (1).
NOTE: Refer to this table for the equipment numbers.
____
~................................................................. | | Equipment Number | | Location ............................ | | Motor | Connector | ................................................................... | No. 1 Main Tank - Fwd | M28 | DM28 | | No. 1 Main Tank - Aft | M22 | DM22 | | No. 2 Main Tank - Fwd | M29 | DM29 | | No. 2 Main Tank - Aft | M23 | DM23 | | No. 3 Main Tank - Fwd | M26 | DM26 | | No. 3 Main Tank - Aft | M31 | DM31 | | No. 4 Main Tank - Fwd | M27 | DM27 | | No. 4 Main Tank - Aft | M32 | DM32 | 2......................................…...........…..............1
S 034-011
(2)
Loosen the drain plug on the motor/impeller unit (1).
S 034-012
(3)
Remove the screws (5) (two or three locations) that attach the bonding clip (9 or 10) to the motor/impeller unit (1) (View B).
S 034-041
(4)
Remove the bonding clip (9 or 10) with the bonding jumper attached (View A-A).
(a)
Do not disassemble the bonding jumper (8), and attachment hardware, from the bonding clip.
S 034-013
(5)
Remove the screw (5) and washers (6) from the motor/impeller unit
(1)
at the 1 o'clock position.
S 494-014
(6)
Install the MS35275-250 retention screws at 1 o'clock and 7 o'clock positions.
(7)
Remove the remaining screws (5) and washers (6).
S 824-057
(8)
Pull the handle on the motor/impeller unit (1) until the
motor/impeller unit (1) is against the retention screws.
S 034-015
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-22-03
ALL ú ú 01 Page 404 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 494-042
(9) Put the container below the motor/impeller unit to catch fuel.
S 684-043
CAUTION: MAKE SURE FUEL DOES NOT CONTINUOUSLY DRAIN FROM THE
_______ MOTOR/IMPELLER UNIT. IF FUEL CONTINUOUSLY DRAINS, THE REMOVAL CHECK VALVE IS NOT CLOSED. THE MOTOR/IMPELLER UNIT MUST BE PUT BACK TO ITS USUAL CONDITION AND THE FUEL TANK DEFUELED BEFORE YOU REMOVE THE MOTOR/IMPELLER UNIT.
(10)
Remove the drain plug.
S 034-044
(11)
Discard the drain plug packing.
S 094-017
(12)
After the motor/impeller unit (1) drains, remove the retention screws from the motor/impeller unit (1).
S 024-018
CAUTION: WHEN YOU REMOVE THE MOTOR/IMPELLER UNIT, FUEL CAN FALL OFF IN
_______ DROPS INTO THE HOUSING FROM ORIFICES IN THE EJECTOR PUMP PRESSURE LINE. TO MAKE SURE A LARGE QUANTITY OF FUEL DOES NOT COLLECT, A REPLACEMENT MOTOR/IMPELLER UNIT MUST BE AVAILABLE.
(13)
Remove the motor/impeller unit (1) from the housing.
S 034-053
(14)
Discard the packings (2, 3, and 4).
TASK 28-22-03-404-019
3. Main Tank Boost Pump Motor/Impeller Unit Installation (Fig. 401)_____________________________________________________
A. Equipment
(1)
Bonding Meter (SWPM 20-20-00)
B.
Consumable Materials
(1)
D00128, Petrolatum - Technical, VV-P-236
(2)
C00064, Coating - Alodine 600 Chemical conversion coating for aluminum or aluminum alloys, (MIL-C-5541).
(3)
C00307, Corrosion Resistant Finish - BMS 10-20 Type II
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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