Assessments - 4, GPA: 3.5
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Burrs on drive links, which prevent them from entering the groove of the guide bar, can be removed with a flat rite. • Keep the chain out of dirt and sand. Even a smaII amount of dirt will dull a chain, increase the possibility of kickback, and require chain sharpening or replacement. • Practice cutting a few small logs using the following techniques to get the "feeF of using your saw before you begin a major sawing operation. • Squeeze the throttIe trigger and allow the engine to reach full speed before cutting. • Begin cutting with the saw frame against the log. • Keep the engine at full speed the entire time you are cutting. • Altow the chain to cut for you. Exert onty light downward pressure, tf you force the cut, damage to the bar, chain, or engine can result. • Release the throttle trigger as soon as the cut is completed, allowing the engine to idle. Ifyou run the saw at full throttle without a cutting toad, unnecessary wear can occur to the chain, bar, and engine. To maxi mize operating efficiency, do not run the engine for longer than 30 _econd_ at a time at full throttle. • To avoid losing control when cut is complete, do not put pressure on saw at end of cut. • Stop the engine before setting the saw down after cutting. 10 TREE FELLING TECHNIQUES _II, WARNING: Check for broken or dead branches which can fall while cutting causing serious injury. Do not cut near buildings or electrical wires if you do not know the direction of tree falt, nor cut at night since you will not be aIe to see well, nor during bad weather such as rain, snow, or strong winds, etc. tf the tree makes contact with any utility Iine, the utility company should be notified immediately. •Carefuily plan your sawing operation in advance. • Ctear the work area. You need a ciear area nil around the tree so you can have secure footing. • The chain saw operator shoutd keep on the uphill side of the terrain as the tree is likely to roll or slide downhill after it is felled. • Study the natural conditions that can cause the tree to fall in a particular direction. Natural conditions that can cause a tree to fail in a particular direction include: • The wind direction and speed. • The lean of the tree. The tean of a tree might not be apparent due to uneven or sloping terrain. Use a piumb or level to determine the direction of tree lean. • Weight and branches on one side. • Surrounding trees and obstactes. Look for decay and rot. If the trunk is rotted, it can snap and fall toward the operator. Check for broken or dead branches which can fall on you while cutting. Make sure there is enough room for the tree to fail Maintain a dis tance of 2 _/2tree lengths from the nearest person or other objects. Engine noise can drown out a warning call. Remove dirt, stones, loose bark, naiis, staples, and wire from the tree where cuts are to be made. Plan a ctear retreat path to the rear and diagonal to the line of fail _ Plan a clear retreat path "_ --=O "_ -Direction of Fal_ FELLING LARGE TREES (6 inches (15 cm) in diameter or larger) The notch method is used to fell large trees. A notch is cut on the side of the tree in the desired direction of fall. After a felling cut is made on the opposite side of tree, the tree wiII tend to fail into the notch. NOTE: If the tree has large buttress roots, remove them before making the notch. If using saw to remove buttress roots, keep saw chain from contacting ground to prevent dulling of the chain. NOTCH CUT AND FELLING THE TREE • Make notch cut by cutting the top of the notch first. Cut through 1/3of the diameter of the tree. Next compiete the notch by cutting the bottom of the notch. See iiiustration. Once the notch is cut remove the notch of wood from the tree. Final (felting) cut here, 2 inches (5 cm) above center of notch i' _.j.. Notch_ _t = • After removing the wood from the notch, make the felling cut on the opposite side of the notch. This is done by making a cut about two inches (5 cm) higher than the center of the notch. This witt leave enough uncut wood between the felling cut and the notch to form a hinge. This hinge wili help prevent the tree from faliing in the wrong direction. Hinge holds tree on stump and helps control fall Opening of felling Closing of notch NOTE: Before felling cut is complete, use wedges to open the cut if necessary to control the direction of fall. To avoid 11 kickback and chain damage, use wood Use a wedge to remove pinched saw or p}astic wedges, but never steel or iron wedges. • Be alert to signs that the tree is ready to fail: cracking sounds, widening of the feI}ing cut, or movement in the upper branches. • As tree starts to fall stop saw, put it down, and get away quickly on your ptanned retreat path. • DO NOT cut down a partially fatten tree with your saw. Be extremely cautious with partially fallen trees that may be poody supported. When a tree doesn't falI comptetely, set the saw aside and pul} down the tree with a cable winch, bIock and tackle, or tractor. CUTTING A F...
Este manual também é adequado para os modelos :Benzo e serras - 358.35181 (983.26 kb)
Benzo e serras - 358.35181 (983.26 kb)
Benzo e serras - 358.35181 (983.26 kb)