Service Manual

Multi Pro 5800 Page 10 − 9 Ultra Sonic Boom Kit (Optional)
Downward Slope in Turf Encountered
During sprayer operation with the sonic boom switch in
the automatic position (sonic boom light is illuminated),
the boom mounted sonic boom sensors continually
send impulse signals and then receive echoes as the
signals bounce off the turf. The Toro Electronic Con-
troller (TEC) determines the sensor distance from the
ground based on the elapsed time between the sensor
signal generation and the received echo. As long as the
sensor height remains the same as the calibrated
height, the spray boom section will remain at a fixed dis-
tance from the ground for spraying accuracy.
When a spray boom section encounters a downward
slope in the turf, the time necessary for the sensor to re-
ceive the signal echo is longer than the calibrated time−
frame. This change in time causes the TEC to energize
the appropriate solenoid valve coils in the hydraulic
boom lift control manifold. The energized coils provide
hydraulic flow from the gear pump to the barrel end of
the boom lift cylinder causing the cylinder to extend and
the boom section to lower. Once the boom section is
lowered to the calibrated distance, the elapsed time be-
tween the sensor signal generation and the received
echo returns to the correct time−frame, manifold coils
are de−energized and the boom stops lowering. This
maintains the boom height at the calibrated distance
from the ground.
The boom sensor target distance is initiated during initial
sonic boom calibration and is typically set at twenty (20)
inches. If the boom target distance changes when in au-
tomatic mode, the TEC will energize the appropriate lift
control manifold solenoid coil(s). The energized coils
will lead to a change in boom lift cylinder length and ulti-
mately a change in boom height.
Figure 4
TOP
PT
G
LC
S3
SH
OR
S4
S2
C2 C1 C3 C4
S5
RIGHT CYLINDER
RETRACT TO RAISE
LEFT CYLINDER
RETRACT TO RAISE
COIL
BOTTOM
COIL
TOP
COIL
BOTTOM
COIL
CONTROL
VALVE
STEERING
FROM
HYDRAULIC
RESERVOIR
FILTER AND
TO OIL
(ENERGIZED)
(ENERGIZED)
(EXTENDING)
LEFT BOOM SECTION LOWER SHOWN
Figure 5
SLOPE
A HIGHER BOOM HEIGHT IS DETECTED SO THE
LIFT CYLINDER EXTENDS TO LOWER BOOM SECTION