Frequently Asked Questions


Common Granulator and Grinder Problems
Symptom Possible problem Corrective Action
• Poor quality regrind - high percent of fines
• Increased vibration
• Increased noise 		• Dull Knives
• Knives not properly gapped
• Plugged screen
• Rotor speed is too high 		• Sharpen or replace with new
• Re-gap knives
• Clean screen
• Change pulleys and/or motor
• Reduced throughput • Dull knives
• Knives not properly gapped
• Plugged screen
• Rotor speed is too high 		• Sharpen or replace with new
• Re-gap knives
• Clean screen
• Change pulleys and/or motor
• Rotor stalls • Dull knives
• Knives not properly gapped
• Plugged screen
• Overloading the machine
• Loose or worn belts 		• Sharpen or replace with new
• Re-gap knives
• Clean screen
• Reduce the feed rate
• Tighten or replace
• Motor will not start • Safety limit switch open
• Blown fuse or breaker 		• Check all limit switches
• Replace or reset
• Regrind collection bin overfill • No high level indicator
• High level indicator broken
• Vacuum line plugged
 • Install
• Replace
• Check vacuum evacuation system