Évaluations - 6, GPA: 3.8
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Photos et spécifications Makita UC4020A |
Facilité d'utilisation
The work is hazardous. Observe local regulations if you wish to fell a tree. (Fig. 26) - Before starting felling work, ensure that: (1) Only persons involved in the felling operation are in the vicinity; (2) Any person involved has an unhindered path of retreat through a range of approximately 45 ° either side of the felling axis. Consider the additional risk of tripping over electrical cables; (3) The base of the trunk is free of foreign objects, roots and ranches; (4) No persons or objects are present over a distance of 2 1/2 tree lengths in the direction in which the tree will fall. - Consider the following with respect to each tree: • Direction of lean; • Loose or dry branches; • Height of the tree; • Natural overhang; • Whether or not the tree is rotten. -Consider the wind speed and direction. Do not carry out felling work if the wind is gusting strongly. -Trimming of root swellings: Begin with the largest swelings. Make the vertical cut first, then the horizontal cut. (Fig. 27) -Cut a scarf: The scarf determines the direction in which the tree will fall, and guides it. It is made on the side towards which the tree is to fall. Cut the scarf as close to the ground as possible. First make the horizontal cut to a depth of 1/5 -1/3 of the trunk diameter. Do not make the scarf too large. Then make the diagonal cut. - Cut any corrections to the scarf across its entire width. (Fig. 28) -Make the back cut a little higher than the base cut of the scarf. The back cut must be exactly horizontal. Leave approximately 1/10 of the trunk diameter between the back cut and the scarf. The wood fibers in the uncut trunk portion act as a hinge. Do not cut right through the fibers under any circumstances, as the tree will otherwise fall unchecked. Insert wedges into the scarf in time. -Only plastic or aluminum wedges may be used to keep the scarf open. The use of iron wedges is prohibited. -Stand to the side of the falling tree. Keep an area clear to the rear of the falling tree up to an angle of 45 ° either side of the tree axis (refer to the “felling area” figure). Pay attention to falling branches. MAINTENANCE MAINTENANCE • Always be sure that the tool is switched off and unplugged before attempting to perform inspection or maintenance. • Always wear gloves when performing any inspection or maintenance. Carry out the maintenance work described below at regular intervals. Warranty claims will be accepted only if these operations have been performed regularly and properly. Only maintenance work described in this instruction manual may be performed by the user. Any other work must be carried out by a MAKITA specialist repair shop. Cleaning the chain saw Clean the saw regularly with a clean rag. The handles, in particular, must be kept free of oil. Checking the plastic housing Carry out regular visual inspections of all parts of the housing. Should any parts be damaged, have them repaired immediately and properly in a MAKITA specialist repair shop. Sharpening the saw chain CAUTION: • Always withdraw the mains plug and wear safety gloves when performing work on the saw chain. (Fig. 29) Sharpen the saw chain when: -Mealy sawdust is produced when damp wood is cut; -The chain penetrates the wood with difficulty, even when heavy pressure is applied; -The cutting edge is obviously damaged; -The saw pulls to the left or right in the wood. The rea son for this behaviour is uneven sharpening of the saw chain, or damage to one side only. Sharpen the saw chain frequently, but remove only a little material each time. Two or three strokes with a file are usually sufficient for routine resharpening. When the saw chain has been resharpened several times, have it sharpened in a MAKITA specialist repair shop. Sharpening criteria: -All cutters must be of equal length (dimension a). Cutters of differing length prevent the chain from running smoothly, and may cause the chain to break. -Do not sharpen the chain once a minimum cutter length of 3 mm has been reached. A new chain must then be fitted. -The chip thickness is determined by the distance between the depth gauge (round nose) and the cutting edge. The best cutting results are obtained with a distance of 0.5 mm between cutting edge and depth gauge. (Fig. 30) -The sharpening angle of 30 ° distance must be the same on all cutters. Differences in angle cause the chain to run roughly and unevenly, accelerate wear, and lead to chain breaks. -The side plate angle of the cutter of 80 ° is determined by the depth of penetration of the round file. If the specified file is used properly, the correct side plate angle is produced automatically. (Fig. 31) File and file guiding (Fig. 32 - 34) -Use a special round file (optional accessory) for saw chains, with a diameter of 4.5 mm, to sharpen the chain. Normal round files are not suitable. -The file should only engage the material on the forward stroke. Lift the file off the material on the return stroke. -Sharpen the shortest cutter first. The length of...
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