9
Manual Controls
A general explanation of manual controller
functions are as follows:
Pressure Relief Valve
The pressure relief valve provides relief when
the pressure exceeds a pre-determined
value. Altering the adjusting stem will aect
the setting at which the relief valve will come
into operation. Turning the stem clockwise
will increase the pressure relief setting. The
pressure gauge gives indication of the delivery
pressure to the boom or gunjet.
By-Pass Valve
The By-pass valve enables all pump delivery
to bypass back to the tank. The by-pass valve
should be engaged when starting the pump
with an engine so that the engine does not
start under load. The by-pass valve should
also be engaged when wanting to agitate the
tank mixture when not spraying. To engage the
by-pass valve, pull the valve lever out. This will
cause all pump delivery to be bypassed back
to the tank.
To disengage the by-pass valve, push the
valve lever in, so that the pump delivery is
directed out to the spray lines
Boom / Attachment Levers
The boom/attachment levers (number tted
dependent on options specied) open or close
ow to the appropriate boom section/s or
attachment/s as labeled. Pull the lever to the
ON position in order to direct ow from the
pump to the required function. Push the lever
to the OFF position to stop ow going to the
attachment that is now not required.
Calibrating your sprayer
Any sprayer should be calibrated regularly
to ensure minimal error in the application
rate. A nozzle selection chart indicates what
application rates are to be expected but
variations due to nozzle wear, ground speed
error and pressure irregularities can result in
large application rate errors.
Goldacres suggest the use of a current TeeJet
nozzle selection catalogue for reference to
nozzle sizes, outputs, spray patterns and
general spraying information. For more
technical information on the function of spray
nozzles and factors aecting their performance
you can also use the TeeJet “User’s guide to
spray nozzles”.
The TeeJet nozzle selection catalogue and
Users guide to spray nozzles are available
from Goldacres dealers or as a free download
from the TeeJet website. www.teejet.com
Application Rate
The application rate depends on the following:
Spray pressure - increasing pressure
increases application rate and reducing
pressure reduces application rate
Speed of travel - increasing speed reduces
application rate and reducing speed increases
application rate
Nozzle size - increasing the nozzle size
increases the application rate.
Nozzle Selection
Refer to the chemical manufacturer’s
information to determine the recommended
application rate in litres per hectare (l/ha) for
your particular situation. Then determine the
speed in kilometres per hour (km/hr) at which
you intend to spray, taking into consideration
the ground conditions of the area to be
sprayed. Using the appropriate chart for your
boom select the most suitable nozzle to use.
Nozzle Calibration
As part of your daily sprayer calibration,
Goldacres suggests that you carry out a jug
test to ensure the spray nozzles you are using
are delivering the correct amount of chemical,
as stated in your nozzle supplier’s rate chart.
The method of carrying out the jug test is as
follows:
You will need:
• A calibrated measuring container that can
measure the medium in litres, in 10 ml
increments. e.g. 0.45 Lt.
• A timing device showing seconds.
• A pressure gauge mounted at the nozzle
tip to verify the system pressure being
delivered at the nozzle. Goldacres part
number QJ4676-1/4-NYR will mount a
suitable gauge to the nozzle body bayonet
tting. (Not including gauge).