Makita UC4030A Owners Manual - Page 17
Amaintenance - replacement chain
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MAINTENANCE Sharpening the saw chain When working on the saw chain you must always pull out the power supply plug and wear protective gloves. The chain needs sharpening when: - the sawdust from sawing humid wood looks like wood flour. - the saw chain penetrates the wood only under great pres- sure. - the cutting edge is visibly damaged. - the sawing device is pulled to the left or the right during the sawing operation. This is caused by uneven sharpening of the chain or by damage to one side of it. Important: Sharpen frequently, but without removing too much metal! Generally, 2-3 strokes of the file will be enough. Have the chain resharpened in a service center when you have sharpened it yourself several times. Proper sharpening: CAUTION: Use only chains and guide bars designed for this saw (see the Extract from the spare‑parts list)! - All cutters must be of the same length (dimension a). Cutters with different lengths result in rough running of the chain and can cause cracks in the chain. ‑ Minimum cutter length is 3 mm (0.11"). Do not resharpen the chain when the minimum cutter length has been reached; at this point, the chain must be replaced (see the Extract from the spare‑parts list and "Replacing the chain"). ‑ The depth of the cut is determined by the difference in height between the depth limiter (round nose) and the cutting edge. ‑ The best results are obtained with a depth‑limiter depth of 0.64 mm (.025"). CAUTION: Excessive depth increases the risk of kickback! ‑ All cutters must be sharpened to the same angle, 30°. Different angles result in a roughly, irregularly running chain, increase wear and tear and cause chain beakage. ‑ The 85° front rake of the cutter results from the cut depth of the round file. If the proper file is used in the right manner, the correct front rake will be obtained automatically. 0,64 mm (.025") 0,64 mm (.025") min. 3 mm (0.11") A 17