Great Plains TM700 Operator Manual - Manual (Page 54)

Tractor Mount Sprayer
500-052M 5/13/2003
52
Pressure Adjustments {Manual Con-
trol System Only}
One of the most important areas of controlling the spray-
er accuracy is to have the proper pressure when
spraying. The pressure is determined when the sprayer
is calibrated. Refer to "Calibration Procedures", start-
ing on page 28.
The electric ball valve is used to adjust the pressure to
the booms. It is controlled with the pressure adjust
switch on the control box. The boom pressure is dis-
played by the boom pressure gauge.
To adjust the pressure, hold the pressure adjust toggle
switch up for more pressure, down for less pressure. If
holding the switch up decreases pressure, reverse wires
at the ball valve. Refer to Figure 11 on page 22 (8).
As the tank level decreases, the boom pressure may
change. Check your boom pressure gauge frequently
and make sure that the pressure doesn’t change. Gen-
erally, the boom pressure will need to be adjusted up
slightly when the tank level decreases.
When the manual pressure adjustment valve {refer to
"Plumbing Diagrams" beginning on page 24} is wide
open, the pressure adjust switch is very sensitive. To de-
crease the sensitivity of the pressure adjust, set the
manual pressure adjustment valve.
To set the manual pressure adjustment valve, open the
electric ball valve wide open with the pressure adjust-
ment switch. Shut the manual pressure adjustment valve
down so the pressure is about 20 psi greater than the
pressure you will spray at {the pressure the spray will be
applied at is determined when you calibrate your spray-
er. Refer to "Calibration Procedures" on page 28}.
With this valve set, it will decrease the flow through the
electric ball valve and reduce the sensitivity of the pres-
sure adjustment switch.