What is the reduction ratio of the CJ603E Wood Chipper/Shredder? The Sun Joe CJ603E reduces your yard waste into 1/21th of its original size. Related articles Wood Chipper Troubleshooting The motor for my CJ603E is not running. What should I do? What should I do if chipping material is not being pulled in? Where can I get replacement blades for my chipper/shredder? How loud is my Chipper Joe CJ602E?