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Information About the Sprayer
Roller pumps are positive displacement pumps, which means that
the entire solution being pumped must go somewhere or the pump
will break. In this roller pumping system, solution is drawn from the
tank and forced to a planned source, such as boom nozzles or hand-
gun. The pressure is controlled by a pressure relief valve, which is a
spring-loaded device that controls the amount of fluid bypassed
(recirculated) to the tank. The gray handle is to be tightened to in-
crease pressure and loosened to decrease pressure.
The 'directo-valve' is the on/off control which allows the operator to
manually control the solution going to the boom.
IMPORTANT:
Remove tank lid and be sure the tank is
clean and free of any foreign material. Rinse tank out of any
tank residue before filling with water to test.
Tip Selection
Important note about tips: Please read this tip selection section
carefully before attempting to operate your boom assembly.
The selection of proper tips for the boom is determined by the gallon
per acre (GPA) requirement which is specified on the chemical label.
The following characteristics also have a determining factor and must
be considered.
1.
Speed of spraying (MPH).
2.
Boom nozzle spacing (specified in inches).
3.
Solution weight and conversion factor (CF)
4.
Gallons of solution to be sprayed per acre.
5.
Spraying pressure.
Useful Formulas:
GPM = Gallons Per Minute
GPA = Gallons Per Acre
MPH = Miles Per Hour
Calibration
Chemical labels may show application rates in gallons per acre,
gallons per 1000 square feet or gallons per 100 square feet. Refer to
your boom owner's manual for rates. Once you know how much you
are going to spray, then determine (from the tip chart) the spraying
pressure (PSI), and the spraying speed (MPH).
Determining the proper speed of the pulling vehicle can be done by
marking off 100, 200 & 300 feet. The speed chart indicates the num-
ber of seconds it takes to travel the distances. Set the throttle and
with a running start, travel the distances. Adjust the throttle until you
travel the distances in the number of seconds indicated by the speed
chart. Once you have reached the throttle setting needed, mark the
throttle location so you can stop and go again, returning to the same
speed.
Add water and proper amount of chemical to the tank and drive to the
starting place for spraying.
Speed Chart
Time Required in seconds to travel a distance of
Speed in M.P.H.
(Miles Per Hour)
100 Ft.
1.0
68 sec.
2.0
34
3.0
23
4.0
17
5.0
14
6.0
11
7.0
9.7
8.0
8.5
9.0
7.6
10.0
6.8
Using the Boom Nozzles
Four things must be considered before spraying with the boom.
How much chemical must be mixed in the tank.
Rate of spray (gallons per acre to be sprayed).
What pressure (p.s.i.) will be used.
Speed traveled (mph) while spraying.
Refer to the chemical label to determine your chemical mixture
See the tip chart to determine the pressure to be used. The
chart will also show the speed used when spraying.
Start the pump and open the valve to the boom nozzles.
Check the spray pattern. Usually you can see the coverage
better on a solid concrete surface, such as a driveway.
Page 2
200 Ft.
300 Ft.
136
205
68
102
45
68
34
51
27
41
23
34
19
29
17
26
15
23
14
20
Spraying Solutions Other Than Water
Since all the tabulations are based on spraying water, which weighs
8.34 lbs. per USA gallon, conversion factors must be used when
spraying solutions which are heavier or lighter than water. To deter-
mine the proper size nozzle for the solution to be sprayed, first multi-
ply the desired GPM or GPA of solution by the rate conversion factor.
Then use the new converted GPM or GPA rate to select the proper
size nozzle.
Example: Desired application rate is 20 GPA of 28% Nitrogen.
Determine the correct nozzle size as follows:
GPA (Solution) x Conversion Factor = GPA
20 GPA (28%) x 1.13 + 22.6 GPA (Water)
The applicator should choose a nozzle size that will supply 22.6 GPA
of water at the desired pressure.
Weight of Solution
7.0 lbs. per gallon
8.0 lbs. per gallon
8.345 lbs. per gallon
(Water)
9.0 lbs. per gallon
10.0 lbs. per gallon
10.66 lbs. per gallon
(28% Nitrogen)
11.0 lbs. per gallon
12.0 lbs. per gallon
14.0 lbs. per gallon
Miscellaneous Conversion Factors
One Acre = 43,560 square feet = 0.405 Hectare
One Hectare = 2.471 Acres
One Gallon Per Acre = 9.35 Liters Per Hectare
One Mile = 5,280 Feet = 1,610 Meters = 1.61 Kilometers
One Gallon = 128 Fluid Ounces = 8 Pints = 4 Quarts = 3.79 Liters =
0.83 Imperial Gallons
One Pound Per Square Inch = 0.069 bar. = 6.895 Kilopascals
One Mile Per Hour = 1.609 Kilometers Per Hour
Higher pressure not only increases the flow rate of the nozzle, but it
also influences the droplet size and the rate of orifice wear. As pres-
sure is increased, the droplet size decreases and the rate of orifice
wear is increased.
The values given in the tabulation section of this owners manual
indicate the most commonly used pressure ranges for the associated
spray tips.
Testing the Sprayer
Attach the sprayer to the tractor 3 point hitch. Mount the pump to the
PTO and affix the torque chain.
NOTE: It is important for to test your sprayer with plain water before
actual spraying is attempted. This will enable you to familiarize your-
self and check for leaks without the possibility of losing any expen-
sive chemicals.
Fill the tank about 1/2 full with plain water.
Before starting, open the suction line valve (located underneath the
carrier frame), turn the relief valve handle out to lower the line pres-
sure. This will help prime the pump.
CAUTION: Always be sure that the water (or solution) has reached
the pump before starting your sprayer. If the pump is allowed to run
dry, serious damage to the pump will result.
Always have the pressure line open to the tips so that the air which
may be trapped in the line will be forced (or purged) out.
Start the tractor PTO. Check the entire system for leaks. Once the
pump is primed, the pressure may be increased by turning the han-
dle of the pressure relief valve in. Keep the pressure line open to the
tips when setting the pressure. Set the pressure and then lock the
relief valve handle in place. Shut off the directo-valve and check for
leaks again. Pressure will increase when the pressure line valve is
closed and then return to the preset pressure when the valve is
opened again.
During the testing period, be sure to observe the spray pattern given
by the spray nozzles. If there is any pattern distortion, it will be
necessary to remove and clean the affected tips.
Specific
Conversion
Gravity
Factors
.84
.92
.96
.98
1.00
1.00
1.08
1.04
1.20
1.10
1.28
1.13
1.32
1.15
1.44
1.20
1.68
1.30
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