Stihl 056 Instruction Manual - Page 12
Pushback, Pull-in
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Pushback: Pushback occurs when the chain on the top of the bar is suddenly stopped and the reaction drives the saw straight back toward the operator causing loss of saw control. It most frequently occurs when the top of the chain is pinched or caught in the cut or contacts a foreign object when the top of the bar is used for cutting. To avoid push back: 1. Be alert to forces or situations that may cause material to pinch the top of the chain. 2. Do not cut more than one log at a time. 3. Do not twist the saw when withdrawing the bar from a plunge cut or under buck because the chain can catch. Pull-in: Pull-in occurs when the bottom of the chain is suddenly stopped. The bottom of the chain stops when it is pinched, caught or encounters a foreign object in the wood. The reaction of the chain pulls the saw forward, causing the operator to lose control. Pull-in frequently occurs when the bumper spike of the saw is not held securely against the tree or limb and when the chain is not rotating at full speed before it contacts the wood. To avoid pull-in, always start a cut with the chain rotating at full speed and the bumper spike in contact with the material. Pull-in may also be prevented by using wedges to open the kerf or cut. To best counter any reactive forces, always maintain proper balance, secure footing, a firm grip on the saw and watch what and where you are cutting. 10