TM-9-2320-283-34-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1983
TM-9-2320-283-34-1 - Page 17 of 624
TM 9-2320-283-34-1
EQUIPMENT DESCRIPTION AND DATA.
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
f.
Transmission.
The transmission is fully automatic with five forward speeds and one reverse speed.
Ratios are
established by four planetary gear sets.
The planetaries are controlled by six hydraulically-applied clutches.All gearing is
in constant mesh.
Major components are described in 1 through10 below:
1.Torque Converter.
A three element torque converter transmits power from the engine to the transmission
gearing.
The torque converter serves as both a fluid coupling and a torque multiplier.
The three elements,
pump, stator, and turbine are vaned cast aluminum.
The pump assembly is the input element and is driven by
the engine through the flex disk and ring gear (flywheel).
The stator is the torque multiplying element.
The
turbine is the output element.
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.
The turbine 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.
1-6
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