T M 9 - 2 3 2 0 - 2 7 9 - 3 4 - 1
CHAPTER 7
TRANSMISSION MAINTENANCE
Contents
P a ra
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
General Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Transmission Shift Tower Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Transmission Removal/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Transmission Installation/Removal From Transmission Stand.... . . . . . . . . . . . . . . . . . . . . . 7-5
Flywheel AssemblyRemoval/Repair/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Torque Converter Stator Removal/Repair/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
Torque Converter Pump Removal/Repair/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Torque ConverterHousingRemoval/Repair/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Transmission Housing Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Oil Pan Removal/Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
Internal Filter Element Removal/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Gear Unit and Main Shaft Assembly Removal/Repair/Installation . . . . . . . . . . . . . . . . . . . . . 7-13
Output Yoke, Dust Shield, and Oil Seal Removal/Installation . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Forward Clutch AssemblyRemoval/Repair/Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
Rear Cover and First Clutch Assembly Removal/Repair/Installation . . . . . . . . . . . . . . . . . . . 7-16
Fourth Clutch AssemblyRemoval/Repair/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Third Clutch and Center Support Housing Removal/Repair/Installation. . . . . . . . . . . . . . . . . 7-18
Second Clutch and Center Support Housing Removal/Repair/Installation . . . . . . . . . . . . . . . 7-19
Control Valve BodyRemoval/Repair/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20
Modulator Valve Removal/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
Lock up Cutoff ValveBodyRemoval/Repair/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-22
Governor Removal/Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-23
Section 1 .
I N T R O D U C T I O N
P a g e
7-1
7-1
7 - 3
7 - 8
7 - 33
7 - 3 6
7 - 47
7 - 50
7 - 55
7 - 68
7 - 72
7 - 76
7 - 77
7 - 89
7 - 91
7 - 1 06
7 - 1 16
7 - 1 22
7 - 1 30
7 - 1 35
7 - 1 53
7 - 1 54
7 - 1 56
7-1. G E N E R A L . This chapter contains maintenance instructions for removal, installation, and repair of
the transmission at the direct support and general support maintenance levels. Subassemblies and parts
which must be removed before transmission components can be removed or repaired are referenced to
other paragraphs of this manual or TM 9-2320-279-20.
S e c t i o n I l . S E R V I C E A N D I N S P E C T I O N
Transmission Maintenance Instructions
7 - 2 . G E N E R A L M A I N T E N A N C E I N S T R U C T I O N S .
a. Follow these maintenance practices when working on the transmission.
(1)
(2)
Handle transmission parts and subassemblies carefully to prevent nicking, scratching, and
denting. Parts which fit together closely and must have proper operating clearance can bind if
damaged. This is very important concerning parts of the control valve body assembly (valves,
when dry, must move freely by their own weight). Parts which depend upon smooth surfaces for
sealing may leak if scratched.
Do not use metal tools on transmission housing when removing gaskets, packings, or seals to
avoid scratching sealing surfaces. Use pointed wooden dowel to remove packings from grooves.
Use wooden or plastic scrapers on gasket surfaces.
7 - 1
