Skil CS4555-00 Guide D'utilisation page 24

When the log is supported on both ends, cut 1/3 of that diameter from the top overbuck.
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Then make the finished cut by underbucking the lower 2/3 to meet the first cut (Fig. 21).
When bucking on a slope, always stand on the uphill side of the log (Fig. 22).
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Log Supported Both Ends
Fig.21
1st Cut Overbuck (1/3 Diameter) to Avoid
Splintering
2nd Cut Underbuck (2/3 Diameter) to Meet
1st Cut (To Avoid Pinching)
To maintain complete control when cutting through, release the cutting pressure near the
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end of the cut without relaxing the grip on the chain saw handles. Don't allow the chain to
contact the ground. After completing the cut, wait for the saw chain to stop before you move
the chain saw. Always stop the motor before moving from tree to tree.
24
Fig. 22