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Traction Control Cable Adjustment (cont'd)
cable is the traction control, squeeze the control
bar
toward the handle and note which cable
sheath moves.) See Figure 51.
2. Move
the jam nuts either up
or
down until you feel
slight resistance when the control bar is
40
mm
(1-1/2)' from the handle.
NOTE: Make
sure that the
two
halves of the
traction control cable sheath
are properly mated
when performing this adjustment.
NOTE: 1990 and newer units will have 'fingertip
adjustable' cables that do not require tools for
adjustment. See Figure 52.
ADJUSTMENT KNOB
Figure 52
3. Once
proper adjustment is attained, tighten the
jam nuts by rotating in opposite directions.
4.
Test for proper operation and repeat adjustment
if necessary.
REAR HEIGHT-OF-CUT SYSTEM (HOC) AND
WHEEL PINION CLUTCH (WPC)
Rear HOC and WPC Operation
Rear Height-Or-Cut System: The rear height-of-cut
system is similar to the front height-of-cut system. By
fastening the wheel to pivoting brackets called pivot
arms, the height-of-cut can be changed from 25 to 75
mm in 13 mm increments (1' to
3 '
in 1/2" increments).
The spring arms hold the pivot arms in their desired
position through the use of a small rivet which drops
into recesses in the housing.
The rear height-of-cut system is a
bit
more complex in
that not only must the wheels pivot, but they must also
drive. This is accomplished by running the output shaft
from the transmission through the pivot point on the
pivot arms. The pinion at the end of the output shaft
drives the wheel gear which is permanently affixed
to
the wheel. Because the output shaft passes through
the pivot point on the pivot
arm, mating of the
two
gears
Self-Propel System
38
is
not
affected by changing
the height-of-cut. See
Figure
53.
PIVOT A R M
PINION GEAR
Figure
53
Wheel Pinion Clutch: The wheel pinion clutch has a
three-fold purpose. One, when the transmission is
engaged,
it
causes the pinions
to move with the output
shaft and drives the wheels. Two,
it
provides differential
action to allow easy turning and excellent
maneuverability. Three,
it
disengages the wheel
pinions from the output shaft when
the operator is not
squeezing the handle. This allows the wheels to turn
backwards without turning the
gears inside the
transmission and provides pullback forces similar to
those found on a hand-push version.
Figure
54
shows a breakdown of the wheel pinion
clutch system. The letters in the illustration refer to the
explanations of each component function below.
k
Figure
54
a.
Output Shaft -turns when the operator squeezes
the handle to provide power to the wheels.
b.
Pivot Arm provides support for the output shaft
with a bushing and a needle bearing.
It
can be
rotated in the end cap to change height-of-cut.
Vacu-Power Mower
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