Using an IRRI axial flow thresher
Before operating the thresher
Optimizing thresher operation
- Long straw: briefly hold the crop bundles at the feed opening for partial threshing. Longer cut material reduces machine output and may result in poor threshing and clogging of the machine.
- Short straw: Recycling the straw if necessary unthreshed loss is high. Panicle-harvested materials (cutting just above the flag leaf) may result in high unthreshed losses because the panicles move rapidly through the thresher without receiving sufficient threshing.
- Hard to thresh varieties: Install stripper bars. The stripper bars prevent straw from wrapping around the cylinder and aid in threshing. Use of stripper bars reduces capacity and increases the amount of finely chopped straw that passes through the concave when threshing overly mature crops, thus they should be installed only when necessary.
- Wet or partially decomposed crop: Reduce feeding rate to avoid overloading. Ensures that the cleaning screen is kept free of clinging straw. Open the cylinder cover periodically to remove straw and chaff accumulation at the lower concave
Maintenance and service
- Lubricate cylinder and fan bearings with a good-quality general purpose grease every 25 hours of operation. Periodically apply a small amount of oil to all hinge points.
- Inspect the machine regularly for loose, worn, or damaged pegteeth, concave bars, cylinder, discharge paddles and other parts, and tighten, repair, or replace them immediately. Missing bolts or nuts must also be replaced.
- Reduce belt tensions by loosening the idler pulley and engine mounting bolts when the machine will not be used for an extended period to minimize deterioration.
- Check engine crankcase oil level at least every 4 operating hours and follow the engine manufacturer's recommendations for oil change intervals and oil grade. Be sure the recommended oil level is maintained.
- Service the air cleaner, fuel filter, fuel line, carburetor, and spark plug regularly according to engine manufacturer's instructions.
Storage of a threshing machine
- Clean the machine thoroughly.
- Remove belts and store in a dry place.
- Store the machine in a clean, dry location and cover to reduce damage from dust accumulation.
- Paint parts that need repainting.
- Clean and apply oil to exposed metal surfaces to prevent rusting.
- Follow the manufacturer's recommendations on engine storage