Makita DUC254RF Instruction Manual

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15 ENGLISHRemoving or installing saw chainCAUTION: The saw chain and the guide barare still hot just after the operation. Let them cooldown enough before carrying out any work onthe tool.CAUTION: Carry out the procedure of install-ing or removing saw chain in a clean place freefrom sawdust and the like.To remove the saw chain, perform the following steps:1. Release the chain brake by pulling the front handguard.2. Loosen the chain adjusting screw, then the retain-ing nut.► Fig.9: 1. Chain adjusting screw 2. Retaining nut3. Remove the sprocket cover then remove the sawchain and guide bar from the chain saw body.To install the saw chain, perform the following steps:1. Check the direction of the saw chain. Match thedirection of the saw chain with that of the mark on thechain saw body.2. Fit one end of the saw chain on the top of theguide bar.3. Fit the other end of the saw chain around thesprocket, then attach the guide bar to the chain sawbody, aligning the hole on the guide bar with the pin onthe chain saw body.► Fig.10: 1. Sprocket 2. Hole4. Insert the protrusion on the sprocket cover to thechain saw body, and then close the cover so that thebolt and pins on the chain saw body meet their counter-parts on the cover.► Fig.11: 1. Protrusion 2. Sprocket cover 3. Bolt 4. Pin5. Tighten the retaining nut to secure the sprocketcover, then loosen it a bit for tension adjustment.► Fig.12: 1. Retaining nutAdjusting saw chain tensionCAUTION: Do not tighten the saw chain toomuch. Excessively high tension of saw chain maycause breakage of saw chain, wear of the guide barand breakage of the adjusting dial.CAUTION: A chain which is too loose canjump off the bar and it may cause an injuryaccident.The saw chain may become loose after many hoursof use. From time to time check the saw chain tensionbefore use.1. Release the chain brake by pulling the front handguard.2. Loosen the retaining nut a bit to loosen thesprocket cover lightly.► Fig.13: 1. Retaining nut3. Lift up the guide bar tip slightly and adjust thechain tension. Turn the chain adjusting screw clockwiseto tighten, turn it counterclockwise to loosen.For chain blade 90PX and 91PX:Tighten the saw chain until the lower side of the sawchain fits in the guide bar rail as illustrated.► Fig.14: 1. Guide bar 2. Saw chain 3. Chain adjust-ing screwFor chain blade 25AP:Tighten the saw chain so that the gap between the cen-ter of the lower side of the guide bar and the saw chainbecomes approximately 1 mm to 2 mm.4. Keep holding the guide bar lightly and tighten thesprocket cover.For chain blade 90PX and 91PX:Make sure that the saw chain does not loose at thelower side.For chain blade 25AP:Make sure that the gap between the center of the lowerside of the guide bar and the saw chain is approximately1 mm to 2 mm.5. Tighten the retaining nut to secure the sprocketcover.► Fig.15: 1. Retaining nutMake sure the saw chain fits snugly against the lowerside of the bar.Spike bumperOptional accessoryWhen cutting thick branches, using the spike bumper isrecommended. To install the spike bumper, perform thefollowing steps:1. Remove the sprocket cover, saw chain, and guidebar.2. Align the holes of the spike bumper with the holeson the chain saw body, and then tighten the screwsfirmly.► Fig.16: 1. Screw 2. Spike bumperOPERATIONLubricationSaw chain is automatically lubricated when the tool is inoperation. Check the amount of remaining oil in the oiltank periodically through the oil inspection window.To refill the tank, lay the chain saw on its side andremove the oil tank cap. The proper amount of oil is 140ml. After refilling the tank, make sure that the oil tankcap is tightened securely.► Fig.17: 1. Oil tank cap 2. Oil inspection windowAfter refilling, hold the chain saw away from thetree. Start it and wait until lubrication on saw chain isadequate.► Fig.18