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 33 of 624
TM 9-2320-283-34-1
EQUIPMENT DESCRIPTION AND DATA.
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
9.
Governor.
The governor assembly is a centrifugal (flywheel) governor driven by a gear on the output
shaft.
Rotation of the governor causes the governor valve to travel within its bore.
When the
valve moves
leftward, governor pressure
rises; when the valve moves rightward, governor pressure falls.
Thus, governor
pressure is proportional to transmission output speed.
Governor pressure, in combination with modulator
pressure, provides the automatic shifting in the transmission.
10.
Valve Body.
The valve body assembly includes the various valves, springs, and other components
which control the selection of ranges, as well as
the automatic
shifting of
gears.
The valve
body assembly
is bolted to the bottom of the transmission case, which is channeled to direct the flow of oil between the valve
body, clutches, and other components.
1-22
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