COMMON GRINDER PROBLEMS

SYMPTOM

POSSIBLE PROBLEM

CORRECTIVE ACTION

Poor quality regrind - high % of fines

Dull Knives

Sharpen or replace with new

Increased vibration

Knives not properly gapped

Re-gap knives

Increased noise

Plugged screen

Clean screen

Rotor speed is to high

Change pulleys and/or motor

Reduced throughput

Dull knives

Sharpen or replace with new

Knives not properly gapped

Re-gap knives

Plugged screen

Clean screen

Rotor speed is too high

Change pulleys and/or motor

Rotor stalls

Dull knives

Sharpen or replace with new

Knives not properly gapped

Re-gap knives

Plugged screen

Clean screen

Overloading the machine

Reduce the feed rate

Loose or worn belts

Tighten or replace

Motor will not start

Safety limit switch open

Check all limit switches

Blown fuse or breaker

Replace or reset

Regrind collection bin overfill

No high level indicator

Install

High level indicator broken

Replace

Vacuum line plugged

Check vacuum evacuation system