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Calibrating the Sprayer
Note: Before you use the sprayer for the first time
or change the nozzles or when the sprayer is out of
adjustment—calibrate the sprayer for ground speed and flow
rate.
Note: The left and right sprayer boom nozzles are wide
pattern (white)nozzles and the center nozzle is narrow pattern
(red) nozzle.
Note: Refer to the chemical product label for output
recommendations.
The method to calibrate the sprayer flow involves driving a
preset distance, recording the time, and then measuring the
amount of liquid applied during that time.
Calculating the Ground Speed
Operator supplied equipment: Stop watch capable of
measuring ± 1/10 second.
1. Measure and visibly mark a course length to use to
calculate your the average ground speed.
Record your course length here
Note: Allow ample distance ahead of the starting
marker to ensure the machine is at full ground speed
when you cross the first marker of the course.
Note: Example: the course length equals 45.7 m
(150 ft).
2. Add clean water into the spray tank 1/2 full; refer to
Filling the Spray Tank (page
3. Drive the sprayer to an area far enough away from
the course so that the machine will be traveling at the
desired ground speed for spraying before the it reaches
the first marker.
4. Use a stop watch to measure the time (in seconds)
that it takes the machine to travel the marked course
(45.7 m (150 ft) in this example) while maintaining the
desired ground speed.
Note: Record your course time in the course time
worksheet.
Course Time Worksheet
Test 1
Test 2
Test 3
5. Repeat steps
2
through
6. Stop the sprayer on a level surface, leave the motion
control lever in the neutral position, and shut off the
engine.
7. Average the three test run times (in seconds) using the
average course time formula below:
.
41).
Time
seconds
seconds
seconds
4
2-additional times.
Record your the average course speed here
Average Course Time Formula
time 1 + time
Formula
Example
8. Use the ground speed formula below to determine the
average ground speed.
Record your the average ground speed here
Note: 1 kph = 16.6 m/minute (1 mph = 88 ft/minute)
Ground Speed Formula
Distance traveled
Formula
m (ft) x 60 seconds
Time (seconds) x
16.7 m/minute (88 ft/minute)
Example 45.7 m (150 ft) x 60 seconds
19.7 seconds x 16.6 m/minute
(88 ft/minute)
Understanding the Effective Spray Pattern Width
Note: Sprayer pressure regulator: 2.8 bar (40 psi).
•
The narrow spray pattern
122 cm (48 inches) wide.
37
.
= The average time to
2 + time 3
drive the course
3
21.6 +
19.1+ 18.4
=
19.7 seconds
seconds
3
.
= Speed (mph)
= 8.4 kph
(5.2 mph)
(Figure
39) on the machine is
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