The John Deere Side Delivery Rake uses a series of rotating bars with teeth to kick the hay to the side until it finally clears the left side of the rake. The side delivery rake tends to fluff the hay up some as well making it easier to get the hay dry. The rotating cylinder with the tooth bars are ground driven meaning that they capture power from one (or both) of the front wheels. This assures that the rake is always coordinated with the ground speed. It works well nearly everywhere except in hilly country. On a side hill, the rake tends to swing downhill due to the configuration and then you have problems. The back of the rake is supported by castor wheels so all the weight of the rake behind the front wheels is available to “pry” the rake sideways.