Makita DUC256 Instruction Manual

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17 ENGLISH— The chip thickness is determined by the distancebetween the depth gauge (round nose) and thecutting edge.— The best cutting results are obtained with followingdistance between cutting edge and depth gauge.• Chain blade 90PX : 0.65 mm• Chain blade 91PX : 0.65 mm• Chain blade 25AP : 0.65 mm► Fig.26— The sharpening angle of 30° must be the same onall cutters. Different cutter angles cause the chainto run roughly and unevenly, accelerate wear, andlead to chain breaks.— Use a suitable round file so that the proper sharp-ening angle is kept against the teeth.• Chain blade 90PX : 55°• Chain blade 91PX : 55°• Chain blade 25AP : 55°File and file guiding— Use a special round file (optional accessory) forsaw chains to sharpen the chain. Normal roundfiles are not suitable.— Diameter of the round file for each saw chain is asfollows:• Chain blade 90PX : 4.5 mm• Chain blade 91PX : 4.0 mm• Chain blade 25AP : 4.0 mm— The file should only engage the cutter on the for-ward stroke. Lift the file off the cutter on the returnstroke.— Sharpen the shortest cutter first. Then the lengthof this shortest cutter becomes the standard for allother cutters on the saw chain.— Guide the file as shown in the figure.► Fig.27: 1. File 2. Saw chain— The file can be guided more easily if a file holder(optional accessory) is employed. The file holderhas markings for the correct sharpening angle of30° (align the markings parallel to the saw chain)and limits the depth of penetration (to 4/5 of thefile diameter).► Fig.28: 1. File holder— After sharpening the chain, check the height of thedepth gauge using the chain gauge tool (optionalaccessory).► Fig.29— Remove any projecting material, however small,with a special flat file (optional accessory).— Round off the front of the depth gauge again.Cleaning the guide barChips and sawdust will build up in the guide bar groove.They may clog the bar groove and impair the oil flow.Clean out the chips and sawdust every time when yousharpen or replace the saw chain.► Fig.30Cleaning the sprocket coverChips and saw dust will accumulate inside of thesprocket cover. Remove the sprocket cover and sawchain from the tool then clean the chips and saw dust.► Fig.31Cleaning the oil discharge holeSmall dust or particles may be built up in the oil dis-charge hole during operation. These dust or particlesmay impair the oil to flow and cause an insufficientlubrication on the whole saw chain. When a poor chainoil delivery occurs at the top of guide bar, clean the oildischarge hole as follows.1. Remove the sprocket cover and saw chain fromthe tool.2. Remove the small dust or particles using a slottedscrewdriver or the like.► Fig.32: 1. Slotted screwdriver 2. Oil discharge hole3. Insert the battery cartridge into the tool. Pull theswitch trigger to flow built-up dust or particles off the oildischarge hole by discharging chain oil.4. Remove the battery cartridge from the tool.Reinstall the sprocket cover and saw chain on the tool.Replacing the sprocketCAUTION: A worn sprocket will damage anew saw chain. Have the sprocket replaced in thiscase.Before fitting a new saw chain, check the condition ofthe sprocket.► Fig.33: 1. Sprocket 2. Areas to be worn outAlways fit a new locking ring when replacing thesprocket.► Fig.34: 1. Locking ring 2. SprocketNOTICE: Make sure that the sprocket is installedas shown in the figure.Storing the tool1. Clean the tool before storing. Remove any chipsand sawdust from the tool after removing the sprocketcover.2. After cleaning the tool, run it under no load to lubri-cate the saw chain and guide bar.3. Cover the guide bar with the guide bar cover.4. Empty the oil tank.