FUEL PUMP/ FUEL METERING UNIT PAD 
SEE  L  SHT 7  DEOILER (REF) 
MANUAL CRANK PAD COVER (REF) 
QEC EQUIPMENT NOT SHOWN FOR CLARITY. NOTE:____  LUBRICATION AND SCAVENGE OIL PUMP IDLER (REF)  MAIN GEARBOX (FRONT VIEW) J 
OIL TANK (REF) 
IDLER (REF)  N SHT 7SEE EEC ALTERNATOR 

M SHT 7SEE EJECTOR PORT  HYDRAULIC PUMP PAD 
STARTER PAD  SEE  O  SHT 7 
SEE  R  Q  SHT 8 
SHT 8RSEE IDG PAD  LUBRICATION AND SCAVENGE OIL PUMP (REF) 
K MAIN GEARBOX (REAR VIEW)  L-A2742 
Engine - Component Location (Details from Sht 5) Figure 102 (Sheet 6) 

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A / PW4000 SERIES /
747-400 / ENGINES /FAULT ISOLATION/MAINT MANUAL ////////////////////////
FUEL PUMP DRIVE OIL SEAL
RETAINING MAINRING GEARBOX
MAIN GEARBOX
PACKING  PACKING
RETAINING
RING
FUEL PUMP FWD PAD
FUEL PUMP/FUEL METERING UNIT PAD  FWD 
EJECTOR 
L  PORT 
L-A0270 
DEOILER DRIVE 
OIL SEAL 

EJECTOR PORT
M
GEARSHAFT
PACKING
SEAL RETAINING PACKING RING MAIN
SEAL GEARBOX
SEAT
GEARSHAFT SPACER FWD
SLEEVE
HYDRAULIC PUMP DRIVE OIL SEAL EEC ALTERNATOR
DRIVE OIL SEAL RETAINING RING
NOTE:EEC ALTERNATOR SHOWN REMOVED.
N
PACKING
MAIN
GEARBOX FWD
HYDRAULIC PUMP PAD
HYDRAULIC PUMP PAD
O
Engine - Component Location (Details from Sht 6)
Figure 102 (Sheet 7)

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A / PW4000 SERIES /
747-400 / ENGINES /FAULT ISOLATION/MAINT MANUAL ////////////////////////
PAD STARTER 
RING RETAINING  OIL SEAL STARTER DRIVE 
DRIVE COUPLING STARTER  PAD STARTER  FWD  PACKING STARTER PAD P  GEARBOX MAIN 
GEARBOX MAIN 
WASHER NUT  FWD  GEARBOX MAIN 
0887 L-A0539  STARTER PAD  IDG PAD 
RING RETAINING Q  INTEGRATED DRIVE DRIVE OIL SEAL GENERATOR (IDG) 
PACKING  R IDG PAD  FWD 
Engine - Component Location (Details from Sht 6) Figure 102 (Sheet 8) 

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A / PW4000 SERIES /
747-400 / ENGINES /FAULT ISOLATION/MAINT MANUAL ////////////////////////
NO. 4 BEARING COMPARTMENT COVER
SEE S
TURBINE EXHAUST SLEEVE, 419 (ENGINE 1), 429 (ENGINE 2), 439 (ENGINE 3), 449 (ENGINE 4)
TURBINE 
EXHAUST 
CASE (REF) 
PACKING 
NO. 4 BEARING 
COVER  BOLT 
(30 LOCATIONS) 

NO. 4 BEARING FWD
HEATSHIELD
NO. 4 BEARING SHIELD
NOTE: EXHAUST SLEEVE AND EXHAUST PLUG REMOVED.
NO. 4 BEARING COMPARTMENT COVER
S
L-A4493
Engine - Component Location
Figure 102 (Sheet 9)

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ENGINE - MAINTENANCE PRACTICES
　
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