I. Main Causes of High Breakage Rate in Threshers

• Drum speed too high

  Excessively high speed creates strong impact, easily cracking grains.
• Threshing clearance too small

  Tight gap between drum and concave plate causes over-squeezing and breakage.
• Grain too dry and brittle

  Over-dried rice or wheat breaks easily on contact.
• Uneven or forced feeding

  Large batches at once lead to uneven force and broken grains.
• Uneven wear on threshing teeth / drum

  Unbalanced force increases breakage.

II. Solutions to Reduce Breakage Rate (adjust in this order)

1. Lower drum speed (most effective)

   Switch the belt to a smaller pulley or slightly loosen the belt to reduce speed.

   Wheat and soybeans are more fragile than rice and require lower speed.
2. Increase threshing clearance appropriately

   Overly small clearance directly causes grain breakage.

   Adjust to a gap that ensures clean threshing without crushing grains.
3. Control grain moisture

   Avoid over-drying to the point of brittleness.

   Slight moisture improves toughness and reduces breakage.
4. Feed evenly and in small amounts

   Maintain steady, light feeding; do not stuff large bundles.

   Smooth operation naturally lowers breakage.
5. Inspect and replace worn parts

   Replace worn or deformed threshing teeth in time.

   Unbalanced drum also increases grain breakage.

III. One-Sentence Summary