Great Plains TM700 Operator Manual - Manual (Page 53)

5/13/2003 500-052M
51 Adjustments
General Field Adjustments
Boom Height
After calibrating your sprayer for the specific nozzle you
will use at a desired pressure, and tractor speed, the
main field adjustment is the boom height. Depending on
which type of nozzle you are using, you need to set your
boom height so that you achieve the correct overlap for
that specific nozzle. If the crop canopy is taller in some
fields than others, you will need to adjust the boom
height accordingly. Refer to the nozzle charts located in
this manual to determine the height of the boom needed.
EXAMPLE: A 2.5 MeterCone ® nozzle at 20 inch spacing
is being used. From the nozzle chart {refer to the Adjust-
ments section of this manual or the Application Guide}, a
height of 19 to 21 inches above the top of the crop is re-
quired. If the crop is 6 inches off the ground, the boom
height should be set to 25 to 27 inches off the ground.
Nozzle Pressure
Another area that will need some field adjustments is the
nozzle pressure. As your tank level decreases, you may
have to adjust the boom pressure to keep the pressure
at the same magnitude for what the sprayer was calibrat-
ed for if your sprayer is not equipped with a monitor.
Watch your pressure gauge and be aware of changes in
the pressure.
Solenoid Throttling Valve {Manual
Control System Only}
The electric solenoids used to turn on the individual
boom sections are three way valves. These valves route
the flow to the boom sections or back into the tank, de-
pending on whether the boom section switches on the
control box are turned on or off.
When a boom section switch is turned to the off position,
the electric solenoid for that switch diverts the flow back
into the inlet of the pump. {Refer to "Plumbing Dia-
grams" beginning on page 24}. To insure that the flow
going to the boom section and the flow going back to the
inlet of the pump are the same, a throttling valve is used
to adjust the flow going to the inlet of the pump. If these
flows were not equal, every time the boom section
switch if flipped, the pressure will either rise or decrease
in the other boom sections, causing the sprayer to over
or under apply chemical in those boom sections.
To set the three solenoid throttling valves complete
the following:
Refer to Figure 13
1. Loosen the lock collar and adjust all three of the
throttling valves until they are closed.
Figure 13
Solenoid Throttling Valve
2. Turn all the boom section switches on with the tank
filled with water {no chemical added} and the pump
running. Adjust the boom pressure until the boom
pressure gauge reaches the selected calibration
pressure.
3. Turn the left boom section switch off and keep the
center and right section switches on. Unscrew the
throttling valve for the left boom section until the
pressure on the boom pressure gauge reaches the
calibration pressure. Flip the left boom section
switch a few times and adjust the throttling valve so
that the pressure remains at the selected calibration
pressure.
4. Turn the left boom section switch on. With the left
and right boom sections on, turn the center boom
section off and adjust the throttling valve as de-
scribed in step 3.
5. Adjust the throttling valve for the right boom section
with the left and center boom sections on as de-
scribed in step 3.
6. With all throttling valves adjusted, it should be pos-
sible to flip any combination of boom section switch-
es with the pressure remaining constant.
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