Because some of us need to trench in looser soil, while others need to trench through rock and frost, mini trenchers can be purchased with different combinations of teeth.
For loose dirt, a cupped tooth works best. It allows the mini trencher to carry more earth with each rotation. This would be referred to as a “dirt chain”.
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In order to cut though hard earth such as rock however, a more aggressive tooth is needed. This is where a rock tooth auger works best. The teeth look like bullets and are made of harder material than a dirt tooth, to cut through the earth.
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The drawback to the dirt chain is that it can’t cut through hard material, while the drawback to the rock tooth is that it can’t clear the trench or pull up loose material.
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This is where the combo chain comes in. A combo chain is a mix of both rock and earth teeth on the same chain. Most of our customers prefer the combo chain set up, unless they know for sure they are only using the trencher for a very specific purpose.
