TRUCK SERVICE MANUAL
TRANSMISSION
Para 2-1/2-4
Section 2. DESCRIPTION AND OPERATION
2-1. SCOPE OF SECTION 2
2-5. TORQUE CONVERTER
This section describes the transmission components
a. Description (B, foldout7). The torque converter
and explains their functions. Also explained are the
consists of three elements pump assembly 21, stator 9,
hydraulic system and torque paths.
and turbine 7. These are vaned elements which are cast
aluminum. Pump assembly 21 is the input element and is
2-3. MOUNTING
driven by the engine through the flywheel. Turbine 7 is
a. To Engine. Converter housing 16 (A, foldout 8)
the output element and is splined to forward clutch and
is machined to provide an SAE 1 mounting flange. This
turbine shaft assembly 5 (A, foldout 11). Stator 9 (B,
flange is mated with an SAE 1 bolt circle at the rear of
foldout 7) is the reaction (torque multiplying) element.
the engine.
The stator is supported on free-wheel roller race 14
which is splined to a stationary ground sleeve. This
An SAE 2 width engine type
b. To Vehicle.
stator arrangement provides an over-running clutch
mounting pad is provided on each side of converter
which permits the stator to rotate freely in one direction
housing 16 (A, foldout 8). Each pad has six 5/8-11
but locks in the opposite direction.
tapped holes. Earlier models provided four 5/8-11
tapped holes on an SAE 1 type mounting pad.
b. Operation
2-4. INPUT DRIVE
(1) The torque converter assembly is
continually filled with oil, which flows through the
A steel laminated flex disk assembly 2 (A, foldout 7)
converter to cool and lubricate it. When the converter is
connects the engine crankshaft and transmission
driven by the engine, the pump vanes throw oil against
flywheel assembly 10. This flywheel serves as the
the turbine vanes. The impact of the oil against the
engine flywheel. The inner circumference of the flex
turbine vanes tends to rotate the turbine.
plate assembly bolts to an adapter which, in turn, bolts to
the engine crankshaft. The plate's outer circumference
(2) The turbine, splined to the turbine shaft,
bolts to flywheel 12. The flywheel is bolted to torque
transmits torque to the transmission gearing. At engine
converter pump 22 (B, foldout 7). Starter ring gear 11
idle speed, the impact of oil against the turbine vanes is
(A, foldout 7) is shrunk onto the flywheel.
not great. At high engine speed, the impact is much
greater than at idle, and high torque is produced by the
turbine.
(3) Oil thrown into the turbine flows to the
stator vanes. The stator vanes change
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