Specifications
MODELS
9301, 9302, 9302E, 9303E, 9600, 9601
ONLY
SECTION
4
THEORY
OF
OPERATION
INTRODUCTION
The Lawn-Boy Riding Mower
is
powered
by
a
vertical shaft four-cycle gasoline engine
mounted on
the
rear
of
the
machine. The vertical crankshaft of
the
engine drives both
the
wheels and
the
cutting blade, with the speed of the forward motion determined
by
the Speed
Selector Lever which provides three forward speeds,
a
reverse, and
a
neutral position. The
speed of the cutting
blade
on the mower
is
determined by the revolutions per minute of the
engine. The throttle allows varying speeds of the engine up to
a
maximum of
3600
rpm.
Because of
the
selective controls of the Rider,
it
is
possible to drive the machine without the
cutting
blade
rotating, to drive the wheels slowly while the cutting
blade
and engine
are
at
full
3600
rpm for maximum cutting in heavy growth, and to regulate from the driver's seat
many combinations of speed and cutting heights.
FIRST
POSITION
FIGURE
2-15
94316
POWER FOR DRIVING THE WHEELS
The driving of the
wheels
is
accomplished through the
use
of
a
large aluminum drive
disc
which
is
keyed to the vertical
crankshaft
of the engine. Because
this
disc
always rotates
at
the speed of
the
engine, transfer of motive power
at
varying speeds
is
accomplished through
the
use
of
linkages, by bringing the rubber-tired drive roller into contact with
the
disc
at
three different positions from the center of the
disc.
The linear speed of any point on
a
wheel
is
highest when
the
point
is
at
the
rim and slowest
at
the hub. The
first
position