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Operation Setting the Boom Height Correct boom height is most important to achieve a uniform spraying pattern. The boom needs to be set at a height above the target, either the ground or the crop depending on the spraying operation, which will achieve 50% overlap of the spray from adjacent nozzles, refer to the section on Calibrating the Sprayer. To set the boom height use the “Lift” switch to raise or lower the boom to the required spraying height. To help judge boom height from the tractor a weighted cord can be attached to the boom at the hinge location on each side. Outer Section Break Back The outer arm fold incorporates a hydraulic valve which enables the outer section to break back if it contacts an obstacle whilst travelling. After clearing the obstacle, it is necessary to return the outer section to the working position by operating the boom “Outer Fold” switch of the electric-overhydraulic control box, or the tractor hydraulic control lever if electric-over-hydraulics are not fitted. The force required to fold the outer section back can be adjusted, refer to the Boom Operators manual for details. Outer Arm Fold This function enables the operating width of the boom to be reduced by hydraulically folding the outer sections back whilst keeping the inner sections in the operating position. Chemical flow to the folded section is stopped by selection of the appropriate switch on the spray controller. Do not fold the outer arms whilst moving as this may cause damage to the boom joints. Use the “Outer Fold” switch of the electric-overhydraulic controls to fold or unfold the outer section. For normal operations where the boom is required to be horizontal, the boom arms are set horizontal with the tilt cylinders. The boom will then self level to the horizontal position if disturbed. Spraybar Operation The selection and operation of the boom sections is controlled from the Silvamatic cabin controller or the optional Farmscan controller. The individual section switches activate electric solenoid valves on the sprayer that direct fluid to the selected sections. The Master switch controls the main solenoid valve that starts and stops fluid flow. On both the Silvamatic and the Farmscan controllers select the required spray boom sections with the individual switches. Once the pattern is set, spraying can then be started and stopped with the Master switch. Boom Tilt (Optional Equipment) The boom can pivot laterally and is self-levelling. When unsettled by travelling over a bump the boom pivots laterally and is brought back to its central position by tension springs each side of the central pivot bearing. An hydraulic damper at each side of the support structure damps the boom oscillations as the sprayer travels over undulating ground. Either side of the boom can be raised for clearing obstacles such as a check bank or fence line, or for operating on a sloping surface. To tilt either arm, or both arms, use the “Left Tilt” and/or “Right Tilt” switches of the control box. 24
General Spraying Information When to Spray Results will be best when the wind speed is low, the temperature is low and the relative humidity is high. An ideal time is at sun up when these conditions are most likely to apply. Droplet Size Although more research is needed to define which is the optimum droplet size collected by particular targets, certain generalisations can be made. The trend with herbicides has been to apply large droplets (250 microns) to reduce the risk of drift but smaller droplets are often the most effective as shown by the following table. 5 0 offset 50 c m Spray height 40 cm for 110 0 50 cm for 80 0 50% overlap DROPLET SIZE COMMENTS BOOM SPRAY PATTERN Large (above 300 microns) Medium (150 - 300 microns) Small (below 250 microns) Poor coverage and poor penetration. Stripping or uneven deposit. Minimal drift. Coverage, deposit and penetration fair. Some drift. Good coverage and good penetration. Uniform application. Drift increased. <strong>Silvan</strong> has a range of standard flat fan nozzles designed for a normal operating pressure of 3.0 bar. For larger droplets there is also a range of low pressure flat fan nozzles designed for a normal operating pressure of 1.0 bar. In general the following factors can be varied to change droplet size. • Reducing pressure increases droplet size. • Reducing the nozzle fan angle (from 110 0 to 80 0 ) increases droplet size. • For an equivalent pressure and fan angle a larger size jet produces larger droplets. Nozzle Height and Spacing To achieve a uniform spray pattern without gaps the output from adjacent nozzles should overlap by 50% at the point of contact with the surface being sprayed. The boom nozzles are spaced at 50 cm intervals and the nozzle caps are offset 5 0 to the axis of the spray line to avoid interference between adjacent spray fans. They can be supplied in either 110 0 or 80 0 fan angle. The correct spray boom height to achieve 50% overlap is 40 cm for 110 0 nozzles and 50 cm for 80 0 but a variation in the order of 5 to 8 cm can be accommodated without noticeable effect. The height referred to is the distance above the target which may be either the vegetation or the ground surface depending upon the operation. Application Rate The application rate depends on the following factors. • Speed of travel - increasing speed reduces application rate and vice versa. • Operating pressure - increasing pressure increases the application rate and reducing pressure decreases the rate. • Nozzle size - increasing the nozzle size increases the application rate. Ground Speed The ground speed read out on modern tractors will normally be sufficiently accurate for spraying purposes but if in doubt it should be checked by the following method. Measure and mark a distance of 100 metres. Fill the sprayer with water and engage the tractor hydraulic drive to the sprayer to simulate normal spraying conditions. Approach the starting mark at the required spraying speed and accurately measure the time in seconds to reach the finishing mark. The ground speed can then be calculated as follows. 360 Speed (km/hr) = Time in seconds for 100 m 25
Page 1 and 2: Operator’s Manual MANBA07 - Rev A
Page 3 and 4: Contents Page Introduction 2 Warran
Page 5 and 6: New Product Warranty WARRANTY POLIC
Page 7 and 8: Safety Information Locations of Saf
Page 9 and 10: Features and Specifications Tank Po
Page 11 and 12: Features and Specifications 2500 li
Page 13 and 14: Description of Fluid Flow The schem
Page 15 and 16: Installation Left Tilt Main Fold Ri
Page 17 and 18: Connecting to the Tractor Adjustabl
Page 19 and 20: Operation Bottom Fill Filter Option
Page 21 and 22: Operation To increase pressure turn
Page 23 and 24: Operation Empty Valve open Knife Va
Page 25: Operation Spray Boom Operation The
Page 29 and 30: Calibrating the Sprayer Testing the
Page 31 and 32: Optional Equipment Hand Valve DIGIT
Page 33 and 34: Lubrication and Maintenance Annual
Page 35: SILVAN AUSTRALIA PTY. LTD. ABN 48 0

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