Granulator Trouble Shooting Guide

Problem:

Inconsistent Grind Size, Excessive Fines & Dust

  • Dull knives
  • Wrong size screen
  • Sharp edges on screen holes
  • Overfeeding
  • Inconsistent screen clearance
  • Worn screen holes
  • Improper knife settings
  • Poor material evacuation
  • Wrong RPM
  • Poor or no scissor cut action
  • Bearings not centered

Low Through Put

  • Dull knives
  • Wrong rotor configuration
  • Loose or worn belts
  • Precut operation required
  • Undersized motor
  • Poor material evacuation
  • Wrong flywheel sheave
  • Wrong size cutting circle

Poor Knife Life

  • Abrasive material
  • Poor knife steel quality
  • Bolts not properly torqued
  • Upgrade steel grade of knife
  • Knives improperly sharpened
  • Improper knife configuration
  • Improper knife clearance

Material Wrap Around

  • No stripper
  • Inboard bearings
  • Wrong rotor configuration

Poor Screen Life

  • Worn screen cradle
  • Unsecured screen
  • Poor cutting action
  • Screen requires treatment or coating
  • Improper material evacuation
  • Non-reversible screens

Machine Stalling & Melt Downs

  • Overfeeding machine
  • Poor level of air flow
  • Improper material evacuation
  • Loose belts
  • Inconsistent screen clearance
  • Improper knife setting
  • Wrong machine size
  • Worn knives
  • Wrong rotor application

Excessive Machine Vibration & Noise

  • Loose motor mounts
  • Damaged rotor
  • Unbalanced rotor
  • Defective or worn bearings
  • Worn belts

Poor Material Evacuation

  • Clogged / damaged vacuum line
  • Poor air flow
  • Incorrect blower rotation
  • Wrong size blower
  • Excessive heat build-up

Overfeeding

  • Wrong infeed configuration
  • Undersized motor
  • Dull knives
  • Inconsistent screen clearance
  • Wrong rotor configuration
  • Undersized machine

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