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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
SEEB
ACCESSORY GEARBOX
TRANSFER GEAR BOX
A

MEC Plumbing Installation
Figure 404 (Sheet 1)

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 72-62-01
 ALL  ú ú C01 Page 414 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
BRACKET
TC1 TUBE
COUPLING NUT

TUBE COUPLING NUT
FWD

MEC Plumbing Installation
Figure 404 (Sheet 2)

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
TRANSFER GEARBOX (TGB)
O-RING A
BOLT WASHER (5 LOCATIONS) HORIZONTAL DRIVE SHAFT HOUSING
COVER N2 ROTOR ROTATION
A
DRIVE PAD
STARTER DRIVE PAD
ACCESSORY GEARBOX (AGB)
LOCKING BOLT 
FWD  AGB  (5 LOCATIONS) 
HOUSING 
A  LOCKING AGB 
ADAPTER 

NOTE: SHOWN WITHOUT QEC FOR CLARITY.
SQUARE DRIVE
N2 ROTOR ROTATION DRIVE GEARSHAFT
A-A
S-M56-MM-1259-(1)-00-B
N2 Drive Pad Cover InstallationFigure 405
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(g) Attach the adapter to the AGB with the locking bolts.
 CAUTION: THE LOCKING NUT OF THE HORIZONTAL DRIVE SHAFT HAS LEFT
_______ HANDED THREADS. DO NOT APPLY A COUNTERCLOCKWISE TORQUE TO THE NUTS AS DAMAGE TO THE DRIVE SHAFT CAN OCCUR.
 (h)  
Use a 856A3604 wrench to loosen the locking nut of the horizontal drive shaft.

 (i)  
Move the horizontal drive shaft rearward and disengage the shaft from the AGB.

 (j)  
Remove the AGB locking adapter.

 (k)  
Install the cover of the N2 pad drive.
 1) Use the five bolts and washers.
 2) Tighten the bolts with your fingers.

 NOTE: Do not apply a torque to the bolts.
____ ú ú NOTE:____If no more than one insert is damaged and it is ú preventing the installation of one bolt to secure ú the cover, do these steps: ú 1. Continued service is permitted until the next ú engine shop visit. ú 2. Use a temporary marking to identify the bolt ú that was intentionally uninstalled. ú
 S 024-026-C00
 (19) Do these steps to remove the TGB from the fan frame.
 (a)  
At two locations, remove the nut, two washers, and bolt which attach the bottom section of the TGB to the fan frame.

 (b)  
At two locations, loosen the nut which attaches the top section of the TGB to the fan frame.

 (c)  
Lift the TGB with a force equal to its weight and do these steps: 1) At two locations, remove the nut, two washers, and bolt

 which attach the top section of the TGB to the fan frame. 2) Carefully disengage the TGB from the fan frame.
　
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