Assessments - 1, GPA: 4
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17. Make the lower horizontal notching cut first. This will help to avoid pinching of either the saw chain or the guide bar when the second notch is being made. Felling back cut Make the felling back cut at least 2 inches (50.8mm) higher than the horizontal notch- ing cut as shown in Fig. 17. Keep the fell- ing back cut parallel to the horizontal notching cut. Make the felling back cut so enough wood is left to act as a hinge. The hinge wood keeps the tree from twisting .and falling in the wrong direction. Do not cut through the hinge. I Fig. 1 As the felling cut gets close to the hinge the tree should begin to fall. If there is any chance that the tree may not fall in the desired direction or it may rock back and bind the saw chain, stop cutting before the felling back cut is complete and use wedges of wood, plastic or aluminum to open the cut and drop the tree along the desired line of fall. When the tree begins to fall remove the chain saw from the cut, stop the motor, put the chain saw down, then use the retreat path planned. Be alert for overhead limbs falling and watch your footing. Limbing a tree LIMB CUT Limbing is removing the branches from a Keep work offgroundfallen tree. When limbing, leave larger Leave support limbs until log is cut lower limbs to support the log off the ground. Remove the small limbs in one cut as shown in Fig. 18. Branches under tension should be cut from the bottom up to avoid binding the chain saw. Bucking a log Bucking is cutting a log into lengths. It is important to make sure your footing is firm and your weight is evenly distributed on both feet. When possible, the log should be raised and supported by the use of limbs, logs or chocks. Follow the simple directions for easy cutting. When the log is supported along its entire length as shown in Fig. 19, it is cut from the top (overbuck). When the log is supported on one end, as shown in Fig. 20, cut 1/3 the diameter from the underside (underbuck). Then make the finished cut by overbucking to meet the first cut. When the log is supported on both ends, as shown in Fig. 21, cut 1/3 of that diameter from the top overbuck. Then make the finished cut by underbucking the lower 2/3 to meet the first cut. I Cut from top (overbuck) avoid cutting earth Fig. 1 2nd cut overbuck (2/3 diameter) to meet 1st cut 1'0 avoid Dinchina) iFig. 24 1st cut overbuck (113 diameter) (to avoid splintering) - ~- 2nd cut underbuck (2/3diameter) to meet 1st cut (to avoid pinching) Fig. 2' When bucking on a slope, always stand on the uphill side of the log, as shown in Fig. 22. When "cutting through", to maintain complete control, release the cutting pres- sure near the end of the cut without re- laxing your grip on the chain saw handles. Don't let the chain 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. log may roll. Fig. 2: Carrying tool Carry the tool by the front handle with the tool turned off, finger off the switch, the guide bar and the saw chain to the rear. Use the scabbard to cover the guide bar and the saw chain. 1 I MAINTENANCE CAUTION : Always be sure that the tool is switched off and unplugged before attempting to perform inspection or maintenance. Filling saw chain To get the most in cutting performance from your tool, you must keep the cutter sharp and filed properly as shown below. TOP PLATE ANGLE SIDE PLATE ANGLE TOP FILING ANGLE A top plate angle of File the side plate to If you have filed the top 30”is ideal. 85’. and side plate correctly the top filling angle will be 60” -automatically. Fig. 2d To file the saw chain, push the file in the direction of the arrow. When pulling it back, be careful not to touch the cutters with the file. File Saw chain After a saw chain has been filed two or three times, the “raker” (see Fig. 24) may need to be filed down slightly. This is because the raker acts as a depth gauge for the cutters. As the cutters are filed, they lose some height due to their angled shape. Eventually, the cutters will become lower than the depth gauge and consequently, will not be able to cut. To remedy this, use a flat file to file the tops of the rakers so that they are about 0.5 mm (0.025”) below the tips of the cutters (see Fig. 24). Be careful not to file the rakers excessively or the cutters will be allowed to take too large of a “bite”, causing the tool to stall or snag in the cut. Removing chip buildup Chips and sawdust will build up in the guide bar groove and oil hole, clogging them and impairing oil flow. Remove the guide bar and clean them out. Clean out r I Fig. 2 Replacing carbon brushes Remove and check the carbon brushes regularly. Replace when they wear down to the limit mark. Keep the carbon brushes clean and free to slip in the holders. Both carbon brushes should be replaced at the same time. Use only Makita carbon brushes. Limit mark I / I - Fig. 28 Use a screwdriver to remove the brush holde...
Este manual também é adequado para os modelos :Benzo e serras - 5016NB (1.16 mb)