24-11-00
 ú CONFIG ú 01 Page 10 ú Nov 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
DOG TOOTH CLUTCH SEPARATION POINT

GENERATOR DRIVE MECHANISM SHOWN DISCONNECTED

Generator Drive Disconnect Mechanism
Figure 4

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 24-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 AC GENERATOR DRIVE SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________
 1.  General (Fig. 1)_______
 A.  The ac generator drive system changes shaft energy from the engine to electrical power for the airplane.
 B.  These are the components of the ac generator drive system:
 (1)  
The variable speed constant frequency (VSCF) generator/converter

 (2)  
The oil cooler

 (3)  
The line oil filter

 (4)  
The quick attach-detach (QAD) ring

 (5)  
The oil overheat switch

 (6)  
The related tubes and fittings

 2.  Variable Speed Constant Frequency Generator/Converter (Fig. 2)_____________________________________________________
 A.  The VSCF changes mechanical energy from a variable speed shaft on the accessory gearbox to constant frequency electrical power.
 B.  The VSCF is on the left side of the engine at the 8 o'clock position. A quick attach-detatch (QAD) adapter kit holds the VSCF to the front of the accessory gearbox.
 C.  The VSCF is interchangeable with the constant speed drive and generator assembly.
 D.  The VSCF weighs approximately 140 pounds (63.5 kg).
 E.  The VSCF contains these components (Fig. 3):
 (1)  
The gearbox is between the accessory gearbox and the generator. It increases the speed of rotation of the generator with a ratio of

 2.96 to 1.
 (a)  There is a sight glass on the gearbox. The sight glass lets you see the oil level in the VSCF.

 (2)  
The generator changes mechanical energy from a variable speed shaft to variable frequency electrical power.

 (a)  There is an oil pump on the generator case. The oil pump makes oil flow to lubricate the VSCF and keep it cool.

 (3)  
The dc filter changes the variable frequency ac power from the generator to dc power.

 (4)  
The inverter changes the dc power to a pulsed ac output.

 (5)  
The ac filter changes the pulsed ac output from the inverter to constant frequency ac power.

 (6)  
The current transformer/electromagnetic interference (CT/EMI) filter monitors the current that comes out of the VSCF. It also removes unwanted signals from the VSCF output.

 (7)  
The generator/converter control unit (GCCU) controls the operation of the generator and the inverter. It also monitors the operation of the most important parts of the VSCF.

 (8)  
The heat exchanger lets cool air from the engine fan remove the heat from the oil in the VSCF.

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 VARIABLE SPEED CONSTANT FREQUENCY  ú 24-11-00
 GENERATOR/CONVERTERS  ú CONFIG 2 ú 01 Page 1 ú Nov 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
VSCF 
GENERATOR/ 
CONVERTER  LINE OIL FILTER 
SEE  A  AND OIL COOLER 
SEE  B 
ENGINE 
OIL TANK 
(REF) 
STARTER 
(REF)  OIL OVERHEAT 
SWITCH 
QAD 
RING 
LINE OIL 
FILTER
VSCF 
GENERATOR/CONVERTER 
ACCESSORY 
GEARBOX 
OIL COOLER 

FWD FWD
ENGINE - LEFT SIDE ENGINE - RIGHT SIDE
AB

AC Generator Drive System - Component Location
Figure 1 (Sheet 1)

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