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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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