1. deflector scraper wear, uneven material distribution, replace with new deflector scraper;
2. the pressure roller is worn, replace with a new one:
3. one of the upper pressure rollers is stuck, check the pressure rollers;
4. deflector scraper assembly position is wrong, reassemble the deflector scraper;
5. the moisture content of the feed is too high, reduce the moisture content.
6. unreasonable load fluctuation or uneven quality of pellets.