is replaced.
Otherwise, direct or general
support
level
of
maintenance does not deal with the hydrostat.
This assembly serves as the power steering unit by supplying
hydraulic pressure to regulating valves which direct this pressure to
the steering clutches in controlled amounts.
The driver varies the
oil pressure to the steer clutches by varying the amount of pressure
applied to the steering control. This in turn varies the amount of
steering obtained. Figure 1-13 illustrates the hydrostatic pump and
motor assembly and its mounting location in the center housing.
At this point you have learned
the names and locations of the
transmission's major assemblies.
In part F you will learn their
function.
PART F - FUNCTIONS OF THE X200-4 TRANSMISSION
MAJOR ASSEMBLIES
1.
General.
This portion of the subcourse discusses the function of the torque
converter, the bevel gear assembly, the range pack assembly, the
hydrostatic pump and motor assembly, the control valve assembly and
the service and parking brakes as they apply to the X200-4
transmission.
The following paragraphs detail the functions of the
aforementioned assemblies.
2.
The Torque Converter.
Vehicle drive power, originating at the flywheel end of the engine,
is transmitted to the transmission by use of a torque converter. The
operating principle of the torque converter is as follows:
a. The converter pump cover and ring gear are splined to the
flywheel of the vehicle engine, which transfers power from the engine
to the converter components.
The turbine shaft extends from the
bevel gear assembly through the input housing and into the converter.
This turbine shaft transmits power from the torque converter to
selected planetary gears in the bevel gear assembly and then to the
output shafts.
The torque converter not only serves as the coupler
between the engine and the transmission, it is also a torque
multiplier.
In some respects, the torque converter is like the fluid coupling.
It has driving and driven members with vanes. Oil is passed from the
driving member (the pump) to the driven member (the turbine) when the
coupling is in operation, thereby transmitting
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