valutazioni - 3, GPA: 3.7
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Facilità d'uso
If you stand on the downhill side, the cut-off log may roll toward you. 4. Felling trees: (1) Undercut (q as shown in Fig. 12): Make undercut facing direction which you want tree to fall. Depth of undercut should be 1/3 of tree’s diameter. Never fell trees without proper undercut. (2) Backcut (w as shown in Fig. 12): Make backcut about 5 cm above and parallel to the horizontal undercut. If the chain is bound during cutting, stop the saw and use wedges to free form it. Do not cut through the tree. CAUTIONS . Trees should not be felled in a manner that would endanger any person, strike any utility line or cause any property damage. . Be sure to stand on the uphill side of the terrain as the tree is likely to roll or slide downhill after it is felled. SHARPENING OF CHAIN BLADE CAUTION Ensure the power source has been disconnected from the tool before performing the steps below. Wear gloves to protect your hands. Dull and worn chain blades will decrease the efficiency of the tool and place unnecessary overload on the motor and various parts of the machine. In order to maintain optimum efficiency, it is necessary to check the chain blades often and keep them properly sharpened and adjusted. Blade sharpening and depth gauge adjustment should be accomplished at the center of the guide bar with the chain properly mounted to the machine. 1. Blade sharpening The accessory round file should be held against the chain blade so that one-fifth of its diameter extends above the top of the blade, as shown in Fig. 13. Sharpen the blades by keeping the round file at a 30° angle in relation to the guide bar, as shown in Fig. 14, ensuring that the round file is held straight, as shown in Fig. 15. Ensure that all saw blades are filed at the some angle, or the cutting efficiency of the tool will be impaired. Appropriate angles for sharpening the blades correctly are shown in Fig. 16. 2. Adjustment of depth gauge To perform this work, please use the optional accessory depth gauge jointer and a standard flat file obtainable in local markets. The dimension shown in Fig. 17 is called the depth gauge. The depth gauge dictates the amount of incision (cutin), and must be accurately maintained. The optimum depth gauge for this tool is 0.5 mm. After repeated blade sharpening, the depth gauge will be decreased. Accordingly, after every 3–4 sharpenings, place the depth gauge jointer as shown in Fig. 18, and file away that portion that protrudes above the upper plane of the depth gauge jointer. CHAIN AND GUIDE BAR ASSEMBLY 1. Mounting (1) Loosen the bolt with the accessory wrench and remove the chain cover. Please be careful not to lose the spring washer attached to the bolt. (2) Mount the chain on the guide bar, and fit the chain to the sprocket as shown in Fig. 19. Ensure that the chain cutters are positioned as shown in the insert in Fig. 20. (3) After fitting the adjustment pin to the guide bar hole, mount the guide bar to the main unit mounting section, and insert the chain into the guide bar groove, as shown in Fig. 20. (4) Replace the chain cover and loosely tighten the bolt. Ensure that the spring washer is properly mounted on the bolt. (5) After properly adjusting the chain tension as directed herein, use the accessory wrench to firmly tighten the bolt. 2. Removal (1) Loosen the bolt with the accessory wrench and remove the chain cover. Please be careful not to lose the spring washer attached to the bolt. (2) By moving the guide bar in the direction indicated by the arrow in Fig. 21, the guide bar will come off and the chain can be removed from the sprocket. MAINTENANCE AND INSPECTION 1. Inspecting the Chain (1) Be sure to occasionally inspect the chain tension. If the chain has become slack, adjust the tension as directed in the section entitled “Adjusting the Chain Tension”. (2) When the chain blades become dull, sharpen them as directed in the section entitled “Sharpening of Chain Blade”. (3) When sawing work has been completed, thoroughly oil the chain and guide bar by depressing the oil English button three or four times while the chain is rotating. This will prevent rusting. 2. Cleaning the Guide Bar When the guide bar groove or the oil hole become clogged with sawdust, oil circulation becomes impaired, which could result in damage to the tool. Occasionally remove the chain cover and clean the groove and oil hole with a length of wire, as shown in Fig. 22. 3. Inspecting the carbon brushes (Fig. 23) The motor employs carbon brushes which are consumable parts. Since an excessively worn carbon brush can result in motor trouble, replace the carbon brushes with new ones having the same carbon brush No. shown in the figure when it becomes worn to or near the “wear limit”. In addition, always keep carbon brushes clean and ensue that they slide freely within the brush holders. [Replacing the carbon brushes] Disassembly (1) Loosen the two machine screws on the tail cover, and remove the tail cover in the direction indicated by the arro...