1. Overfeeding & Unsuitable Material
- Jamming often happens when feeding speed is too fast or material exceeds the design range.
- Bulky, hard, or wet material thrown in at once may not have enough time to be sheared and discharged.
- High moisture content, strong wrapping tendency, and oversized pieces increase blockage risk.
2. Hard Objects & Foreign Matter
- Hidden metal blocks, stones, thick bolts, and other foreign objects can wedge between cutters or damage the cutter edge.
- When a hard object enters the crushing chamber, load rises quickly and shafts may stop.
- One of the most common causes of sudden jamming during mixed waste processing.
3. Worn or Loose Cutters
- Worn, chipped, or improperly adjusted cutters reduce cutting efficiency.
- If cutter gap becomes too large, material cannot be sheared cleanly and may pile up inside the chamber.
- Loose cutter bolts or shifted cutter discs can cause abnormal resistance and lead to jamming.
4. Discharge Blockage & Protection Failure
- Jamming is not always caused by the cutting zone.
- Blocked discharge outlet, poor downstream conveyor matching, or clogged screen can make crushed material accumulate and push back into the chamber.
- If PLC overload protection or automatic reverse function is not set correctly, the machine may continue under high load instead of reversing.
