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6.7
MEASURING GROUND SPEED _______________________________________________
The Spraytek offers five forward speeds, plus a high-low
differential range. This gives you the option of ten (10)
possible speeds. All spraying operations should be
performed with the differential set in the low speed.
KPH
1
2
3
4
5
1.4 2.3 3.7 5.5
7.0
1.4 2.4 3.8 5.7
7.2
1.5 2.5 3.9 5.9
7.5
1.5 2.6 4.1 6.1
7.7
1.6 2.7 4.2 6.3
8.0
1.6 2.7 4.3 6.5
8.2
1.7 2.8 4.5 6.7
8.5
1.7 2.9 4.6 6.9
8.7
1.8 3.0 4.7 7.1
9.0
It is recommended you establish ground speed based on
the following information:
Measure a test course in the area to be sprayed or in an
area with similar surface conditions (terrain) of the area
to be sprayed.
A minimum length of 100 ft. (30.5 M) to test speeds up to
5 MPH (8 km/h) is recommended.
A minimum length of 200 ft (61 M) to test speeds from 5
MPH (8 km/h) up to 10 MPH (16 km/h) is recommended.
To help ensure accuracy, conduct the speed check with
the sprayer tank half-full and select the throttle setting
and forward gear that will be used when spraying.
Determine the time required to travel the test course and
run the course several times using the average time of all
runs.
6.8
NOZZLE TIP SIZE __________________________________________________________
Tip size selected for use in your sprayer will depend on
the desired GPM rate per nozzle, ground speed, nozzle
spacing, and spray pressure. The following chart will help
in determining tip size, etc. when using the formulas
mentioned on the previous page. The chart was taken
from Page 10 of TeeJet Catalog 49A. For a complete
listing of tip options and charts, call SDI or your local
dealer for a new TeeJet Catalog.
An example of using the chart and formula:
Fixed Constants:
2
G/1000 ft
=1
MPH = 2.9
W = 20 inch Nozzle Spacing
GPM (per nozzle) = (G/1000 ft
KPH
1
2
3
4
4.4 7.4 11.7 17.7
22.4
4.5 7.7 12.2 18.3
23.2
4.7 8.0 12.6 19.0
24.0
4.9 8.2 13.0 19.6
24.8
5.0 8.5 13.4 20.2
25.6
5.2 8.7 13.8 20.9
26.4
5.3 9.0 14.2 21.5
27.2
5.5 9.3 14.7 22.1
28.0
5.6 9.5 15.1 22.8
28.8
2
x MPH x W) / 136
SPRAYER OPERATION
The spray pump is designed to run with an engine speed
of 3,000 to 3,200 rpm. The ground control decal indicates
the speed the vehicle should travel at different engine
rpm settings.
5
RPM
1
2
3
2800
0.9 1.4 2.3 3.4
2900
0.9 1.5 2.4 3.6 4.5
3000
0.9 1.5 2.4 3.7
3100
0.9 1.6 2.5 3.8
3200
1.0 1.6 2.6 3.9
3300
1.0 1.7 2.7 4.1
3400
1.0 1.7 2.8 4.2
3500
1.1 1.8 2.8 4.3
3600
1.1 1.9 2.9 4.4
Use the following equation or the table shown to
determine ground speed.
speed (MPH) = (Distance ft x 60) / (Time (Seconds) x 88
Speed in MPH
(km/h)
0.5 (0.8)
1.0 (1.6)
1.5 (2.4)
2 (3.2)
2.5 (4.0)
3.0 (4.8)
3.5 (5.6)
4.0 (6.4)
4.5 (7.2)
5.0 (8.0)
GPM (per nozzle) = (1 x 2.9 x 20) / 136 = 29 / 136
GPM (per nozzle) = 0.426
If we take the answer (0.426) and look at the chart on the
next page, we see a brown XR tip at 30 psi (206 kPa) or a
gray XR tip at a 20 psi (138 kPa) will apply the proper
amount based on Rate/Speed & Spacing constants used
in the formula.
MPH
4
5
1
2
4.3
2.7 4.6
7.3 11.0
2.8 4.8
7.6 11.4 14.4
4.7
2.9 4.9
7.8 11.8
4.8
3.0 5.1
8.1 12.2
5.0
3.1 5.3
8.3 12.6
5.1
3.2 5.4
8.6 13.0
5.3
3.3 5.6
8.9 13.4
5.4
3.4 5.8
9.1 13.8
5.6
3.5 5.9
9.4 14.1
Time in Seconds
100 ft
200 ft
(30.5 m)
(61 m)
136
272
68
136
46
92
34
68
27
54
23
46
20
40
17
34
15
30
13
28
6
MPH
3
4
5
13.9
14.9
15.4
15.9
16.4
16.9
17.4
17.9
Figure 6C
300 ft
(91.4 m)
409
205
136
103
82
68
58
52
45
41
29
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