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AU8000
SPRAYER
Operator's Handbook
and
Parts Catalogue
Micron Sprayers Limited
Bromyard Industrial Estate
Bromyard
Herefordshire HR7 4HS
United Kingdom
Tel: (01885) 482397
+44 1885 482397
Fax: (01885) 483043
+44 1885 483043
E-mail: micron@micron.co.uk Iss 12
Web site: www.micron.co.uk 07/03
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TABLE OF CONTENTS 1. INTRODUCTION ............................................................................................. 1 2. SPECIFICATION ............................................................................................. 1 3. ASSEMBLY ..................................................................................................... 2 4. OPERATION ................................................................................................... 3 4.1
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1. INTRODUCTION The AU8000 Sprayer consists of a Micronair AU8000 sprayhead mounted on a knapsack mistblower. The sprayhead provides a narrow, easily controlled spectrum of spray droplets to ensure an even distribution of product with a minimum of wastage. Air from the mistblower rotates the atomiser and is then directed into the airstream which carries the spray safely away from the operator and ensures maximum swath width and penetration of foliage. The AU8000 sprayer is intended
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2 3. ASSEMBLY These instructions apply both to AU8000 sprayheads supplied as part of a complete sprayer and to sprayheads supplied as conversion kits. The steps with numbers in square brackets [ ] refer to conversion kits ONLY and should be disregarded when assembling a sprayer supplied complete. There may be some minor differences when installing conversion kits on some models of sprayer. Parts are identified by their reference number in Fig. 5. [1.] Ensure that the mistblower is emp
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3 Fig. 1 – Attachment of AU8000 Sprayhead to Mistblower 4. OPERATION This section describes the operation of an AU8000 sprayer with the knapsack mistblower supplied by Micronair. If the sprayhead is used with a different mistblower, some operating procedures may differ; refer to the mistblower manufacturer's instructions. 4.1. Operation of Standard Sprayer 1. Make up a mixture of 25 parts regular (NOT high octane) petrol (gasoline) and 1 part (4%) two-stroke oil. Standard eng
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4 6. Open the fuel valve. 7. Set the choke lever on the carburettor to the C (closed) position. In hot climates, it may only be necessary to set the choke to mid-position. If the engine is already warm, leave the lever in the A (open) position. 8. Set the throttle lever (on the left-hand side of the frame) to mid-position and turn on ignition switch located in the throttle lever. 9. Ensure that the sprayhead is in a safe place away from foliage or obstructions. 10. Start the engine by
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5 21. Set the throttle lever to the idle position after closing the chemical valve if the sprayer is not to be used for more than one or two minutes. However, do not allow the engine to idle for a prolonged period (see point 14 above). 22. To stop the engine, move the throttle lever to the fully closed position, and turn off the switch. 23. The entire sprayer, including the AU8000 sprayhead, must be thoroughly cleaned after use. If ULV chemicals have been used, they must be removed with
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6 4. If possible, avoid completely emptying the spray tank. Should the tank become empty, DISENGAGE the pump IMMEDIATELY to avoid the possibility of damage by running dry. NOTE: The output of the sprayer with the pump running will be higher than with no pump. See section 6.1 for full details. 4.3. Operation of Sprayer with Filling Pump This section applies only to sprayers fitted with the optional pump and suction filling facility. 1. Pour about 0.5 litre of chemical into the tank an
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7 The following recommendations are for guidance only and do not exclude any statutory requirement: 1. Always wear adequate protective clothing, eye protection and respiratory protection when mixing, transferring or spraying pesticides. The minimum level of protection will be stated on the chemical label or in the Code of Practice in most countries. 2. Protective clothing, respirators etc must be removed as soon as exposure to pesticides has ceased. All items must be washed or disposed
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8 6. CALIBRATION As with any mistblower, an AU8000 sprayer must be calibrated before use. This involves setting the correct output rate of chemical and adjusting the sprayhead to produce the appropriate droplet size for the chemical and application technique being used. The following sections describe the calibration of a standard Micronair AU8000 sprayer. Some details of the procedures may differ if the sprayhead is used with a different model of mistblower. 6.1. Output Rate of Ch
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9 Fig. 3 – Coverage of Sprayer 3. Calculate the area treated by the sprayer per minute. Fig. 3 shows the sprayer being operated over a field crop. If the operator is walking at S Km/Hr this corresponds to 1000 x S metres/hour: Distance travelled = 1000 x S metres/minute 60 If the width of the swath is W metres, then the area treated per minute is: Area treated = 1000 x S x W sq metres/minute 60 This is converted to hectares by dividing b
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10 Example: Speed: 4 Km/Hour Swath Width: 12 m Therefore: Area treated = S x W 4 x 12 = 0.08 ha/min 600 600 Table 1 shows the coverage of the sprayer for various swath widths and spraying speeds. 4. Calculate the required output from the sprayer in litres/minute to give the correct application rate for the chemical being used. The output rate of chemical is given by the area sprayed (in hectares) per minute multiplied by the required application rate in litres pe
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11 6. Fit a restrictor tube (8) to the outlet of the valve. Tighten the cap nut (14) firmly by hand. 7. Push a 15 cm (6") length of 6 mm (¼") inside diameter plastic hose over the restrictor tube. 8. Ensure that the chemical on/off valve is closed. 9. Fill the tank of the mistblower to half its normal working capacity with the chemical to be used. 10. Start the engine of the mistblower and run it at the correct operating speed (see section 4.1). 11. Support the sprayhead at its normal
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12 Example: Dose: 0.5 L/tree Time: 1.5 min/tree Output = 0.5 = 0.33 litre/min 1.5 5. Calibrate the sprayer as described earlier. 6.2. Adjustment of Droplet Size The size of the droplets produced by the sprayhead depends upon the rotational speed of the atomiser and the properties of the chemical. The speed of the atomiser is controlled by the velocity of air from the blower fan and by the angle of the fan blades. As the mistblower is designed to run at a fixed blower s
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13 Fig. 4 – Setting Marks on Blade 7. Reassemble the sprayhead by reversing steps (1 – 5). 8. Carry out a test by spraying the actual chemical to be used onto sensitive cards, paper or slides. Check that the spray deposit is appropriate for the chemical and application technique. Note that sensitive cards only give a good indication of the number of droplets larger than about 60 microns. Smaller droplets may not mark some types of card. The apparent size of droplets on the ca
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14 7.1. Knapsack Mistblower – Routine Maintenance The mistblower will have a long and trouble-free life if it is kept clean and properly adjusted. Attention must be given to the following points: 1. Chemical must NEVER be left in the tank or pipework. Always flush out the sprayer with water or a solvent for the chemical used. Drain cleaning liquid from the sprayer before storage. 2. Do not leave fuel in the tank or carburettor whilst the sprayer is in storage. After use, close the fu
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15 UNSTEADY ENGINE RPM OR TENDENCY TO STOP Fault Remedy 9. Loose spark plug Tighten spark plug 10. See points 5 - 8 above 11. Ignition lead damaged or not making Fasten or replace lead contact ENGINE IDLE UNSTEADY Fault Remedy 12. Idle advance jet obstructed Clean 13. Idle advance screw requires adjustment Adjust ENGINE DOES NOT DEVELOP MAXIMUM POWER Fault Remedy 14. Carburettor jet contaminated Clean 15. Spark plug contaminated Clean and check gap
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16 7.3. Maintenance of Sprayhead The AU8000 sprayhead is built from chemical resistant materials and its simple design and robust construction will ensure many years of trouble-free performance provided that it is not mistreated and is properly cleaned after use. The AU8000 atomiser is dynamically balanced to ensure that it will run smoothly without vibration. Some chemicals, particularly certain ULV formulations, can dry or crystalise on the gauze, blocking the mesh and causing the at
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17 After dismantling the atomiser, the following should be checked: Gauze (104) – Free of dents or chemical contamination Bearings (113) – Both in good condition. If one bearing is faulty, both must be replaced Tolerance Rings (116) – Not cracked or deformed Bearing Spacers – Not corroded or worn (106 and 107) V-Ring Seal (114) – In good condition and not cut or worn Nilos Ring (115) – Not worn or bent Any worn and damaged parts must be replaced with genuin
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18 8. PARTS LISTS When ordering spare parts, please specify the following information: Serial number of sprayhead or engine Approximate date of purchase Description of part Part number as shown in this section Number of parts required 8.1. AU8000 Sprayhead Item Part No Description Quantity 1 EX3678 AU8000 Atomiser Assy 1 2 EX3682 Front Casing Assy 1 3 EX4032 Support Ring 1 4 EX3681 Rear Casing 1 5 EX4017 Cone 1 6 EX2192 Nut 1 7 EX3673 Nipple 1 8 EX4035-39 Restrictor T
