72-60-00
ALL ú ú C05 Page 219 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(e) Engage the threads of the bolt through the self-aligning nut in the QAD clamp. 1) Tighten the bolt with your fingers.
S 412-039-C00
(5)
Do this task: Fuel Pump Package Installation (AMM 73-11-01/401).
S 412-033-C00
(6)
Close the left fan cowl panels (AMM 71-11-02/201).
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72-60-00
ALL ú ú C05 Page 220 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
INLET GEARBOX - DESCRIPTION AND OPERATION
_________________________________________
1. General
_______
A. The inlet gearbox (IGB) is located in the fan frame sump and is bolted to the forward side of the fan frame aft flange (Fig. 1). The gearbox contains a horizontal bevel gear, a radial bevel gear, and engine thrust (No. 3 ball) bearing.
2. Horizontal Bevel Gear
_____________________
A. The horizontal bevel gear, which has 47 teeth, is splined to the high pressure compressor rotor front shaft and secured to it by the No. 3 ball bearing locking nut. The horizontal bevel gear mates to the radial bevel gear to provide rotational torque to the transfer gearbox (TGB).
3. Radial Bevel Gear
_________________
A. The radial bevel gear, which has 35 teeth, is mounted on two roller bearings and one ball bearing (there are no duplex bearings). The gear is internally splined to accept the radial drive shaft which is removable from the exterior of the engine to allow individual replacement of the IGB and TGB.
4. Thrust Bearing (No. 3 Ball)
___________________________
A. The No. 3 ball bearing is installed during IGB assembly between the gearbox housing and the horizontal bevel gear. It positions the N2 rotor axially and provides radial positioning of the forward end of the high pressure compressor (HPC) rotor.
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72-61-00
ALL ú ú C01 Page 1 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
NO. 3 BALL
BEARING
HORIZONTAL
BEVEL GEAR
NO. 3 BEARING
LOCKING NUT
RADIAL BEVEL GEAR
HOUSING
G-M56-MM-0070(1)-00-C
Inlet Gearbox Location Figure 1
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72-61-00
ALL ú ú C01 Page 2 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
TRANSFER GEARBOX - DESCRIPTION AND OPERATION
____________________________________________
1. General
_______
A. The transfer gearbox (TGB) assembly provides power transmission between the inlet gearbox (IGB) and the accessory gearbox (AGB) (Fig. 1).
B. It consists of the following major components:
(1)
Radial drive shaft
(2)
Transfer gearbox
(3)
Horizontal drive shaft
2. Radial Drive Shaft (Fig. 1)
__________________
A. The radial drive shaft assembly is installed inside the fan frame No. 10 strut at the 9 o'clock position. It consists of the radial drive shaft and the shaft midlength bearing.
B. The radial drive shaft is made of steel alloy. It is hollow and measures approximately 25.4 inches (654 mm) in length. Both ends are externally splined and connect the IGB bevel gear and the TGB bevel gear. An impeller integrally machined on the radial drive shaft creates a suction effect for oil vapor exhaust.
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