Makita UA003G Instruction Manual

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20 ENGLISHSharpening the saw chainSharpen the saw chain when:• Mealy sawdust is produced when damp wood iscut;• The chain penetrates the wood with difficulty, evenwhen heavy pressure is applied;• The cutting edge is obviously damaged;• The saw pulls to the left or right in the wood.(caused by uneven sharpening of the saw chain ordamage to one side only)Sharpen the saw chain frequently but a little each time.Two or three strokes with a file are usually sufficient forroutine resharpening. When the saw chain has beenresharpened several times, have it sharpened in ourauthorized service center.Sharpening criteria:WARNING: An excessive distance betweenthe cutting edge and depth gauge increases therisk of kickback.► Fig.40: 1. Cutter length 2. Distance between cuttingedge and depth gauge 3. Minimum cutterlength (3 mm)— All cutter length must be equal. Different cutterlengths prevent the saw chain from runningsmoothly and may cause the saw chain to break.— Do not sharpen the chain when the cutter lengthhas reached 3 mm or shorter. The chain must bereplaced with new one.— 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► Fig.41— 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°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— 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.42: 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.43: 1. File holder— After sharpening the chain, check the height of thedepth gauge using the chain gauge tool (optionalaccessory).► Fig.44— 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.45Cleaning 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.46Cleaning 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.47: 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. If the sprocket is worn or damaged, askMakita Authorized Service Centers for replacement.► Fig.48: 1. Sprocket 2. Areas to be worn out

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