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Hersteller: Poulan Dateigröße: 5.58 mb Dateiname: 07134130e.pdf Unterrichtssprache:

. Do not fell trees near electrical wires or buildings. Leave this operation for professionals. . Cut only when visibility and light are adequate for you to see clearly. operation Tree Felling See Figures 12-16. Unusual Hazardous Tree Felling Conditions Do not fell trees during periods of high wind or heavy precipitation. Wait to do your cutting until the hazard has ended. WARNING: Do not cut down trees having an extreme lean or large trees that have rotten limbs, loose bark, or hollow trunks. Have these trees pushed or dragged down with heavy equipment, then cut them up. WARNING: Electrocution hazard. Do not cut trees or branches near power lines or electrical wires. Contact with power lines or live electrical wires will result in serious personal injury or possible death. WARNING: Do not cut trees or branches near buildings, which may result in serious injuries or property damage. WARNING: Check the tree for damaged or dead branches that could fall and hit you during felling. WARNING: Periodically glance at the top of the tree during the backcut to assure the tree is going to fall in the desired direction. WARNING: If the tree starts to fall in the wrong direction, or if the saw gets caught or hung up during the fall, leave the saw and save yourself! . Felling a tree - When bucking and felling operations are being performed by two or more persons, at the same time, the felling operation should be separated from the bucking operation by a distance of at least twice the height of the tree being felled. Trees should not be felled in a manner that would endanger any person, strike any utility line or cause any property damage. If the tree does make contact with any utility line, the utility company should be notified immediately. . Before any cuts are started, pick your escape route (or routes in case the intended route is blocked); clear the immediate area around the tree and make sure there are no obstructions in your planned path of retreat. Clear path of safe retreat approximately 135° from planned line of fall. The retreat path should extend back and diagonally to the rear of the expected line of fall. See Figure 12. . Before felling is started, consider the force and direction of the wind, the lean and balance of the tree, and the location of large limbs. These things influence the direction in which the tree will fall. Do not try to fell a tree along a line different from its natural line of fall. . The chain saw operator should keep on the uphill side of the terrain as the tree is likely to roll or slide downhill after it is felled. . Remove dirt, stones, loose bark, nails, staples, and wire from the tree where felling cuts are to be made. . Notched Undercut. Cut a notch about 1/3 the diameter of the tree, perpendicular to the direction of fall. Make the cuts of the notch so they intersect at a right angle to the line of fall. This notch should be cleaned out to leave a straight line. To keep the weight of the wood off the saw, always make the lower cut of the notch before the upper cut. See Figure 14. . Felling Backcut. The backcut is always made level and horizontal, and at a minimum of 2 in. above the horizontal cut of the notch. See Figures 14 - 15. . Never cut through to the notch. Always leave a band of wood between the notch and backcut (approximately 2 in. or 1/10 the diameter of the tree). This is called “hinge” or “hingewood.” It controls the fall of the tree and prevents slipping or twisting or shoot-back of the tree off the stump. See Figures 14 - 15. . On large diameter trees, stop the back cut before it is deep enough for the tree to either fall or settle back on the stump. Then insert soft wooden or plastic wedges into the cut so they do not touch the chain. The wedges can be driven in, little by little, to help jack the tree over. See Figure 16. operation . As tree starts to fall, stop the chain saw and put it down immediately. Retreat along the cleared path, but watch the action in case something falls your way. Be alert for overhead limbs or branches that may fall and watch your footing. WARNING: Never cut through to the notch when making a backcut. The hinge controls the fall of the tree, this is the section of wood between the notch and backcut. Bucking See Figures 17 - 20. Bucking is the term used for cutting a fallen tree to the desired log length. . Always make sure your footing is secure and your weight is distributed evenly on both feet. .. Cut only one log at a time. .. Support small logs on a saw horse or another log while bucking. .. Keep a clear cutting area. Make sure that no objects can contact the guide bar nose and chain during cutting, this can cause kickback. Refer to Precautions Against Kickback earlier in this manual. .. When bucking on a slope, always stand on the uphill side of the log. To maintain complete control of the chain saw when cutting through the log, release the cutting pressure near the end of the cut without relaxing your grip on the chain saw handle...

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