Micron Technology Turbofan instruction manual DRAFT 4.2.13Filter, 4.3Spray Liquid

DRAFT

4.2.13Filter

All hydraulic systems MUST be filtered. For sprayers using the tractor’s hydraulic sys- tem, a return line filter with a 25 micron replaceable cartridge and a full-flow by-pass re- lief valve should be fitted in the return line to the tractor.

A pressure side filter MUST also be fitted in order to protect the gear motors and shaft seals. A 10 micron filter should be used located between the tractor remote hydraulic coupling (supply) and the first component in the sprayhead hydraulic circuit.

Self-contained systems should preferably be fitted with a 125 micron suction strainer be- tween the oil reservoir and the hydraulic pump. A 25 micron replaceable cartridge filter with a full-flow by-pass relief valve must always be fitted in the return to the reservoir. Ensure that the filters are of adequate size to maintain oil flow even when partially blocked. The return filter should be fitted with a pressure gauge to monitor the condition of the filter by checking the back-pressure.

A pressure side filter should also be fitted to self-contained systems. See Fig 6 .

4.3Spray Liquid

The flow of spray liquid to each Turbofan Sprayhead must be regulated to give the correct total output from the sprayer and consequently the required application rate on the crop.

Chemical flow can be regulated by either a fixed or a variable restrictor unit in the feedpipe to each sprayhead.

Fixed restrictors or variable restrictors are available from Micron Sprayers as optional extras.

The MICRON fixed restrictor uses an orifice plate fitted in a housing which can be installed into the inlet connection of the sprayhead (Page 25, Item No. 29 , Micron Part No. 6197).

See Section 7 (’CALIBRATION AND ADJUSTMENT’) for full details of the fixed restrictor calibration procedure.

Unlike hydraulic nozzles, Micron Turbofan Sprayheads do not require a high pressure to operate. Droplet size is unaffected by system pressure. The pressure should, therefore, be selected to give the correct liquid flow through the restrictor (see Calibration section).

If an existing sprayer is to be converted, the original spray pump can often be retained. If this pump is a high pressure type or if it has excess capacity, it may be necessary to fit an adjustable pressure regulator in the feed to the sprayheads. If a pressure regulator is already fitted but cannot be adjusted to a sufficiently low pressure, it will be necessary to fit a second low pressure regulator to the output of the main regulator. This allows the first regulator to by-pass the majority of the surplus flow to the tank and provide a stabilised input to the second regulator.

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