TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 686 of 894
TRUCK SERVICE MANUAL
Para 2-1/2-4
Section 2.
DESCRIPTION AND OPERATION
2-1.
SCOPE OF SECTION 2
This section describes the transmission components
and explains their functions.
Also explained are the
hydraulic system and torque paths.
2-3.
MOUNTING
a. To Engine.
Converter housing 16 (A, foldout 8)
is machined to provide an SAE 1 mounting flange.
This
flange is mated with an SAE 1 bolt circle at the rear of
the engine.
b. To Vehicle.
An SAE 2 width engine type
mounting pad is provided on each side of converter
housing 16 (A, foldout 8).
Each pad has six 5/8-11
tapped holes.
Earlier models provided four 5/8-11
tapped holes on an SAE 1 type mounting pad.
2-4.
INPUT DRIVE
A steel laminated flex disk assembly 2 (A, foldout 7)
connects the engine crankshaft and transmission
flywheel assembly 10.
This flywheel serves as the
engine flywheel.
The inner circumference of the flex
plate assembly bolts to an adapter which, in turn, bolts to
the engine crankshaft.
The plate’s outer circumference
bolts to flywheel 12.
The flywheel is bolted to torque
converter pump 22 (B, foldout 7).
Starter ring gear 11
(A, foldout 7) is shrunk onto the flywheel.
2-5.
TORQUE CONVERTER
a. Description (B, foldout7).
The torque converter
consists of three elements pump assembly 21, stator 9,
and turbine 7.
These are vaned elements which are cast
aluminum. Pump assembly 21 is the input element and is
driven by the engine through the flywheel.
Turbine 7 is
the output element and is splined to forward clutch and
turbine shaft assembly 5 (A, foldout 11).
Stator 9 (B,
foldout 7) is the reaction (torque multiplying) element.
The stator is supported on free-wheel roller race 14
which is splined to a stationary ground sleeve.
This
stator arrangement provides an over-running clutch
which permits the stator to rotate freely in one direction
but locks in the opposite direction.
b. Operation
(1)
The
torque
converter
assembly
is
continually filled with oil, which flows through the
converter to cool and lubricate it.
When the converter is
driven by the engine, the pump vanes throw oil against
the turbine vanes.
The impact of the oil against the
turbine vanes tends to rotate the turbine.
(2)
The turbine, splined to the turbine shaft,
transmits torque to the transmission gearing.
At engine
idle speed, the impact of oil against the turbine vanes is
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
679
TRANSMISSION
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