
Inadequate lubrication/maintenance of pellet mill's press roller
Insufficient oil, degraded grease in roller bearings, or blocked lubrication channels
Failure to add suitable grease to the roller on schedule
Violation of pellet mill operating standards
No preheating of ring die before startup, or sudden feed speed changes
Uncleaned residual material after shutdown—causing forced extrusion of dried material on restart
Wear of pellet mill's own components
Worn-out roller surface patterns, or ring die wear/deformation
Drive system (gears/motor) faults—leading to unstable roller speed