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 B.  The power to drive the accessories is obtained from the high pressure compressor (HPC). A towershaft (radial driveshaft) in the intermediate case is geared to the front of the rotor.
 C.  The radial driveshaft drives the angle gearbox bevel gear set which transmits power to the main gearbox through the gearbox layshaft (horizontal driveshaft). The angle gearbox is located between the intermediate case inner and outer diameter wall at the 6 o'clock position.
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LOW PRESSURE 
TURBINE (LPT) 
NO. 4 BEARING 
COMPARTMENT 
SEE  B 
A 
SEE  A 
A 
L-A0342 GROUND HANDLING 
ATTACHMENT POINTS 
(REAR) 
FRONT VIEW 
A 
NO. 4 BEARING  NO. 4 BEARING 
COMPARTMENT 
TURBINE EXHAUST 
CASE STRUT 
EXHAUST PLUG 
MOUNTING FLANGE 
REAR VIEW 
B 
TURBINE EXHAUST 
CASE STRUT 
EXHAUST SLEEVE 
TURBINE EXHAUST  MOUNTING FLANGE 
CASE RAILS 
A-A  L-A0343 
Turbine Exhaust Case 
Figure 15 

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
INTERMEDIATE
CASE

RADIAL
DRIVESHAFT

MAIN GEARBOX ANGLE GEARBOX SEE B
SEE C
HORIZONTAL DRIVESHAFT
A L-A0532
Accessory DrivesFigure 16 (Sheet 1)
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OIL TANK
MAIN OIL FILTER SEE E HOUSING
SEE  D 
DEOILER 
FWD 
FUEL PUMP/ 
FUEL METERING 
UNIT PAD 
DRIVESHAFT 
PAD 
OIL PUMP 
IDLER  L-A2736 
MAIN GEARBOX 
B 

FWD
ANGLE GEARBOX C
L-A0531
Accessory Drives
Figure 16 (Sheet 2)

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
MAIN OIL FILTER HOUSING
DRIVESHAFT PAD
FUEL PUMP/ FUEL METERING UNIT PAD
DEOILER
MANUAL CRANK PAD COVER
LUBRICATION
AND SCAVENGE
OIL PUMP IDLER

MAIN GEARBOX (FRONT VIEW)
D
OIL TANK
IDLER  EEC ALTERNATOR
HYDRAULIC PUMP PAD
STARTER DEOILER PAD OUTLET (BREATHER)
IDG PAD
LUBRICATION AND SCAVENGE OIL PUMP
MAIN GEARBOX (REAR VIEW)
L-A2742 E
Accessory Drives
Figure 16 (Sheet 3)

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D.  The main gearbox incorporates drive pads for the engine fuel pump and fuel metering unit (tandem mounted), hydraulic pump, starter, and the integrated drive generator. Provisions are also incorporated to permit hand cranking of the HPC rotor to allow more complete inspection through the borescope ports.
　
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