Toro 41188, Service Manual

Page: 321 / 353

Multi Pro 1750 Page 9 − 11 Ultra Sonic Boom Kit (Optional)
Rise 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 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 distance from
the ground for spraying accuracy.
When a spray boom section encounters a rise in the turf,
the time necessary for the sensor to receive the signal
echo is shorter than the calibrated time−frame. This
change in time causes the TEC to energize the appropri-
ate lift control manifold solenoid coils. The energized
coils provide hydraulic flow from the gear pump to the
rod end of the boom lift cylinder causing the cylinder to
retract and the boom section to raise. This maintains the
boom height at the calibrated distance from the ground.
Once the boom section is raised to the calibrated dis-
tance, the elapsed time between the sensor signal gen-
eration and the received echo returns to the correct
time−frame and the boom stops raising.
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 5
TOP
P T
G
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
RIGHT BOOM SECTION RAISE SHOWN
LC
(ENERGIZED)
(ENERGIZED)
(RETRACTING)
Figure 6
RISE
A LOWER BOOM HEIGHT IS DETECTED SO THE
LIFT CYLINDER RETRACTS TO RAISE BOOM SECTION
Ultra Sonic
Boom (Opt.)