Great Plains TA520S Operator Manual - Manual (Page 53)

3/18/2005 500-061M
51 Field Adjustments
Field 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. Refer to "Man-
ual Elevator Option" on page 24. 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 ac-
cordingly. 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 section 4 of
this manual or the Application Guide}, a height of 19 to
21 inches above the top of the crop is required. If the
crop is 6 inches off the ground, the boom height should
be set to 25 to 27 inches off the ground.
After setting your boom height, there may be a need to
adjust the fold latch when the boom is ready to be folded.
Refer to Figure 14 on page 25. If a hose fitting or nozzle
is positioned where the fold latch is located, the fold latch
needs to be offset with the carrier extension provided.
The carrier extension can be mounted in the forward or
rearward direction. After repositioning the fold latch, be
sure to torque bolts to the specifications listed in the
"Torque Values Chart" on page 62. If boom height is in
the lower ranges, you may want to raise the boom for
transport. Refer to "Manual Elevator Option" on
page 24.
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.
Tank Straps
The tank straps that wrap around the sprayer tank may
become loose after the first few hours of operation. This
occurs when the tank settles in the saddle. Polyethylene
tanks are especially susceptible to this. Retighten the
tank straps to secure your tank.
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 22}. 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.
Refer to Figure 18
1. Loosen the lock collar and adjust all three of the
throttling valves until they are closed.
Figure 18
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.
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