Toro 41188, Service Manual

Page: 333 / 353

Multi Pro 1750 Page 9 − 23 Ultra Sonic Boom Kit (Optional)
Sonic Sensors
Two (2) identical sonic sensors are used in the Ultra
Sonic Boom System. The sensors are mounted to the
spray booms (Figs. 15, 16 and 17). During sprayer op-
eration with the sonic boom switch in the automatic posi-
tion, the sonic sensors provide inputs for the Toro
Electronic Controller (TEC) to keep the booms at a
constant distance from the ground.
During sprayer operation, the sonic boom sensor con-
tinually sends an impulse signal and then receives an
echo as the signal bounces off the turf. The TEC estab-
lishes the sensor distance from the ground based on the
time between the sensor signal generation and the re-
ceived echo. The TEC then determines if the boom
height is different than the calibrated height and, if nec-
essary, energizes the appropriate solenoid(s) on the hy-
draulic lift control manifold to change the boom height.
Sensors should be secured to the spray booms correctly
for proper sonic sensor operation. Refer to the Ultra
Sonic Boom Kit Installation Instructions for sonic sensor
installation and setup information.
The sonic sensors and their circuit wiring can be tested
as TEC inputs with the Diagnostic Display (see Diagnos-
tic Display in the Troubleshooting section of this chap-
ter). Because of the solid state circuitry built into the
sensors, there is no method to test them directly. The
sensors may be damaged if an attempt is made to test
them with an electrical test device (e.g. digital multime-
ter or test light)
IMPORTANT: Do not spray water at or on the sen-
sors. Water sprayed under even household pres-
sure can damage the sensor. Always install sensor
cap on sensor before washing the sprayer. Also,
install cap when sprayer is not in use.
As required, use a damp cloth to clean the sensors.
Make sure that the sensor covers and caps are clean
and dry before installing them on sensors. When the
sprayer is not being used, it is recommended to have the
caps installed on the sensors for sensor protection.
Each of the sonic sensor assemblies includes a pro-
gramming plug for sensor accuracy. If a programming
plug is removed from the sensor, make sure that the ar-
row below the sideways T on the plug is aligned with the
notch on the top edge of the sensor (Fig. 18).
NOTE: The two (2) sonic sensors are identical. To as-
sist in troubleshooting, sensors can be exchanged. If the
problem follows the exchanged sensor, an electrical
problem likely exists with the sensor. If the problem re-
mains unchanged, something other than the sensor is
the problem source.
1. Sonic sensor
2. Lower housing
3. Nut (2 used)
4. Cover
5. Programming
plug
6. Cap
Figure 15
4
6
1
5
2
3
14 to 16 ft−lb
(19 to 21 N−m)
1. Sensor with cover 2. Sensor without cover
Figure 16
1
2
1. Sonic sensor
2. Harness connector
3. Nut (2 used)
4. Lower
housing
Figure 17
1
2
4
3
Ultra Sonic
Boom (Opt.)