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 CAUTION: DO NOT LET THE WEIGHT OF THE FUEL PUMP OR THE FUEL
_______ PUMP UNIT BE MOVED ON THE PUMP SPLINES DURING THE REMOVAL. IF THIS OCCURS, DAMAGE TO THE FUEL PUMP CAN OCCUR.
 5)  Move the fuel pump (11) or the fuel pump unit (6 and 11) forward to disengage the drive spline, bolts (60), and the fuel tube (34).
 6) Remove the fuel pump (11) or the fuel pump unit (11 and 6). 7) Remove the packings (35 and 37) from the groove on the pump drive spline and the base of the fuel pump (11).
 8)  Remove the retainers (12) and the packings (13) from the ends of the supply tube (3) for the fuel distribution valve.
 9) Remove the packing (42) from the oil-cooler-outlet fuel hose (36). 10) Remove the packing (41) from the oil-cooler-inlet fuel tube (34). 11) Discard the retainers (12) and the packings (13, 41, and 42).
 (n) If you used the PWA 85989 handling fixture, remove the bolts which attach the fuel pump (11) to the handling fixture.
 S 024-109-N00
 (5)  
If you will replace the fuel pump (11), remove the parts from the fuel pump with the steps that follow:

 (a)  
Remove the differential pressure switch S1585 (52) for the fuel filter: 1) Remove the bolts (51) and washers (50) which connect the

 differential pressure switch (52) to the fuel pump (11). 2) Remove the differential pressure switch (52). 3) Discard the packings (49).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  
ENGINES PRE-PW-SB 73-161;
 Remove the thermocouple probe:
 1) Remove the thermocouple probe (45) for the EEC fuel

 temperature. 2) Remove the adapter (45A) from the fuel pump (11). a) Discard the packing (46).

 (c)  
ENGINES POST-PW-SB 73-161;
 Remove the thermocouple probe (71) and bracket assembly with
 the steps that follow:
 1) Remove the bolts (78) that attach the thermocouple probe

 

 (71). 2) Carefully remove the thermocouple probe (71) from the fuel pump (11). 3) Remove the countersunk screws (72) that attach the bracket
 (73) to the bracket (75). 4) Remove the bracket (73). 5) Remove the bolt (77) that attaches the bracket (75) to the
 plug (62). 6) Remove the bracket (75). 7) Remove the bushing (76) from the fuel pump (11).
 a) Discard the packing (74).
 (d)  
Remove the plug (62) from the port on the fuel pump (11).

 (e)  
Remove the elbow (29) and the union (30) from the drain port of the fuel pump (11).

 (f)  
Discard the packings (31 and 61).

 (g)  
If you removed the fuel pump as one unit (6 and 11), remove the FMU M3108 from the fuel pump with the steps that follow: 1) Remove the nuts (47) and washers (48) which attach the FMU

 (6) to the fuel pump (11). 2) Remove the FMU (6) from the fuel pump (11). 3) Remove the packings (58 and 59) from the transfer tubes for
 the fuel pump (11).
 a) Discard the packings (58 and 59).

 S 024-110-N00
 (6)  
If you removed the fuel pump unit (11 and 6) and you will also replace the FMU (6), remove these parts from the FMU:

 (a)  
Remove the adapter (39) from the FMU (6).
 1) Discard the packing (38).

 (b)  
Remove two bolts (55) which attach the adapter (54) to the FMU (6): 1) Remove the adapter (54) and the packing (53). 2) Discard the packing (53).

 S 624-030-N00
 (7)  
If you will not install the same FMU (6) in 24 hours, do the preservation procedure:

 (a)  
Drain all remaining fuel from the FMU (6).

 (b)  
Install caps on all ports but not on the transfer tube port for the fuel pump (11).

 (c)  
Put the FMU (6) on a bench in a level position (as installed).

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 ALL  ú ú N02 Page 413 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
　
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