11
Spraying
Planning to Spray Safely
• Before commencing spraying, plan the work effectively to reduce potential contamination.
• Wind direction and speed must be taken into account. Avoid spraying on still, hot and sunny
days or when wind speed exceeds 6.5km/h.
• Do not spray if the operator, bystanders, watercourses or any non-target vegetation appears
to be in danger from spray drift contamination.
• Drift can be reduced by lower nozzle height, lower pressures or by fitting larger nozzles.
Setting Up Your Spray & Adjusting the Regulator
• Prior to commencing spraying, you will need to adjust the regulator knob (blue) to suit the
desired pressure and spraying style.
• Winding the regulator clockwise will increase spraying pressure. Winding it anti-clockwise
will return liquid to the tank, increasing mixing and reducing spraying pressure.
• To begin, turn on the pump and activate the trigger or boom valve. Adjust the regulator to
achieve the desired pressure on the gauge. Turn off the hand lance/boom valve and check
to ensure the pump is not turning rapidly on and off or cycling. If the pump is cycling, you
will need to reduce the spraying pressure slightly until this stops.
NOTE: To operate the hand spray lance on-demand (where the pump activates only when the
trigger is pulled), wind the regulator clockwise completely until it stops. No water can return to
the tank and the pump pressure switch will control the pump operation.
When Spraying
• Spray at a constant speed (as used during calibration) and shut off the hand lance trigger at
the end of each swath or before changing direction.
• Work in parallel lines at the correct spacing when spraying a large area – this is better than
moving the hand lance from side to side in a swinging movement which causes damage by
overdosing.
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