(2)
No. 4 roller bearing

 (3)
No. 5 roller bearing

 2.  Low Pressure Turbine Shaft
__________________________
 A.  The LPT shaft is made of steel alloy. It is located concentrically in the high pressure rotor system. Its forward end is provided with outer splines for coupling with the fan shaft. It is axially retained by a shoulder and a coupling nut. At the aft end of the shaft, the No. 4 and 5 bearings are located axially on both sides of an integral hub. On the rear face, the hub supports two rotating air/oil seals which control the air circulation through the LPT rotor and the sump pressurizing air. On the front face, the hub supports the LPT stub shaft.
 B.  The LPT stub shaft is made of steel alloy. It provides for coupling between the LPT shaft and the conical rotor support. Its front face supports the forward rotating air and oil seals.
 C.  The center vent tube is made of titanium alloy. It is installed inside the LPT shaft. Its forward end is inserted in the LPT shaft plug and its aft end is supported by the LPT shaft hub. At mid-length, it is supported through two expandable spacer centering devices.
 D.  The center vent tube rear extension duct is installed at the aft end of the center vent tube. Its relative angular position is maintained by locating dowels, and axial retention is provided by an inner nut threaded into the center vent tube. A centrifugal air/oil separator is retained by a nut against a central shoulder on the duct. Its relative angular position is maintained by slots at its front end.
 3.  No. 4 Bearing
_____________
 A.  The No. 4 bearing, which takes the high pressure turbine (HPT) rotor radial loads, is a roller bearing installed between the HPT rear shaft and the LPT shaft. The bearing outer race is housed in the HPT rear shaft bore, and its inner race is bolted to the front face of the LPT shaft integral hub. The inner race has a shoulder which acts as an emergency bearing in case of roller failure. The inner race front end is provided with a sump air seal.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////

NO. 5 ROLLER
REAR ROTATING
AIR/OIL SEAL BEARING
SHAFT ROTOR SUPPORT

S-M56-MM-0307-(1)-01-B
Low Pressure Turbine Shaft Location Figure 1
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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 ////////////////////////
4.  No. 5 Bearing
_____________
 A.  The No. 5 bearing supports the LPT rotor aft end inside the turbine frame and takes the radial loads. The bearing outer race is mounted in the turbine frame and its inner race is mounted at the rear of the LPT shaft integral hub. A bumper forward of the inner race acts as an emergency bearing in case of roller failure. The inner race relative angular position is maintained by three bolts, and axial retention is provided by a retainer nut. The relative position of the retainer nut is maintained by a rivet.
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 ALL  ú ú C01 Page 3 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
LOW PRESSURE TURBINE SHAFT ASSEMBLY - MAINTENANCE PRACTICES
___________________________________________________________
 1.  General
_______
 A.  This procedure gives instructions for the removal and replacement of the LPT shaft plug O-rings.
　
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