Assessments - 2, GPA: 3.5
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lowing procedure, the engine must be turned off. IMPORTANT POINTS • Check chain tension before first use and after 1 minute of operation. See CHAIN TENSION in the ASSEMBLY section. • Cut wood only. Do not cut metal, plastics, masonry, non-wocd building materials, etc. • Stop the saw if the chain strikes a foreign object. Inspect the saw and repair parts as necessary. • Keepthechainoutofdirtandsand. Evena small amountofdirt will quickly dull a chain and increase the possibility of kickback. • Practice cutting a few small logs using the following techniques to get the "feel" of using your saw before you begin a major sawing operation. • Squeeze the throttle 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. • Allow the chain to cut for you. Exert only light downward pressure. • Releasethe throttletrigger as soon as the cut is completed, allowing the engine to idle. If you run the saw at full throttle without a cutting load, unnecessary wear can occur. • 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. TREE FELLING TECHNIQUES _;IWARNING: Check for broken or dead branches which can fall while cutting causing serious injury. Do not cut nearbuildings or electricalwires if you do not know the directionoftree fall, norcut at night sinceyou will not be ale to see well, nor during bad weathersuch as rain, snow, or strong winds, etc. If the tree makes contact with any utility line, the utility company should be notified immediately. • Carefullyplan your sawingoperationin advance. • Cleartheworkarea. You needacleararea all aroundthetreeso you can havesecure footing. • The chain saw operator should keep on the uphill side of the terrain as the tree is likelyto rollor slidedownhillafterit 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 fall in a particular direction include: • The wind direction and speed. • The lean of the tree. The lean of a tree might not be apparent due to uneven or slopingterrain. Use a plumb or level to determine the direction of tree lean. • Weight and branches on one side. • Surroundingtrees and obstacles. Look for decay and rot. Ifthetrunk 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 fall. Maintain a distance of 2-1/2 tree lengths from the nearest person or other objects. Engine noise can drown out a warning call. Remove dirt, stones, loose bark, nails, staples, and wire from the tree wherecuts are to be made. Plan a clear retreat path to the rear and diagonal to the line of fall. _X_z,_. Plan a clear retreat path }.... LJ""'_-Direction of Fall FELLING LARGE TREES (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 inthe de sired direction of fall. After a felling cut is made on the opposite side of tree, the tree will tend to fall into the notch. NOTE: If the tree has large buttress roots, removethem beforemakingthenotch. 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 1/3 of the diameter of the tree. Next complete the notch by cutting the bottom of the notch. See illustration. Once the notch is cut remove the notch of wood from the tree. 10 Final (felling) cut here. 2" (5 cm) above center of_otch. First cut ,5c_ _ / --,:.1 / --x!". /I Seco_6__Notchcut_: .... _ 5 cm • After removing the cutout of wood, make the felling cut on the opposite side of the notch. This is done by making a cut about two inches higher than the center of the notch. This will leave enough uncut wood between the felling cut and the notch to form a hinge. This hingewill help prevent the tree from falling in the wrong direction. Hinge holds tree on stump and helpscontrol fall Opening of felling cut Closing of notch NOTE: Before felling cut is complete, use wedges to open the cut when necessary to controlthe directionof fall. To avoid kickback and chain damage, use wood or plastic wedges, but never steel or iron wedges. • Be alert to signs that the tree is ready to fall: cracking sounds, widening of the felling cut, or movement in the upper branches. • As tree starts to fall, stop saw, put it down, and get away quickly on your planned retreat path. • DO NOT cut down a partially fallen tree with your saw. Be extremely cautious with partially fallen trees that may be poorly supported. When a tree doesn't fall completely, set the saw aside and pull down the tree with a cable winch, block and tackle, or tractor. CUTTING A FALLEN TREE (BUCKING) Bucking is the term u...
Este manual também é adequado para os modelos :Benzo e serras - 136 (1.01 mb)