Makita BUC121 User Manual

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11FUNCTIONAL DESCRIPTIONCAUTION:• Always be sure that the tool is switched off and thebattery cartridge is removed before adjusting orchecking function on the tool.Installing or removing battery cartridgeFig.1CAUTION:• Always switch off the tool before installing orremoving of the battery cartridge.• Hold the tool and the battery cartridge firmly wheninstalling or removing battery cartridge. Failure tohold the tool and the battery cartridge firmly may causethem to slip off your hands and result in damage to thetool and battery cartridge and a personal injury.To remove the battery cartridge, slide it from the toolwhile sliding the button on the front of the cartridge.To install the battery cartridge, align the tongue on thebattery cartridge with the groove in the housing and slipit into place. Insert it all the way until it locks in placewith a little click. If you can see the red indicator on theupper side of the button, it is not locked completely.CAUTION:• Always install the battery cartridge fully until thered indicator cannot be seen. If not, it mayaccidentally fall out of the tool, causing injury toyou or someone around you.• Do not install the battery cartridge forcibly. If thecartridge does not slide in easily, it is not beinginserted correctly.Battery protection system (Lithium-ionbattery with star marking)Fig.2Lithium-ion batteries with a star marking are equippedwith a protection system. This system automatically cutsoff power to the tool to extend battery life.The tool will automatically stop during operation if thetool and/or battery are placed under one of the followingconditions:• Overloaded:The tool is operated in a manner that causesit to draw an abnormally high current.In this situation, release the trigger switch onthe tool and stop the application that causedthe tool to become overloaded. Then pull thetrigger switch again to restart.If the tool does not start, the battery isoverheated. In this situation, let the batterycool before pulling the trigger switch again.• Low battery voltage:The remaining battery capacity is too lowand the tool will not operate. In this situation,remove and recharge the battery.Switch actionCAUTION:• Before inserting the battery cartridge into the tool,always check to see that the switch triggeractuates properly and returns to the "OFF"position when released.Fig.3To prevent the switch trigger from being accidentallypulled, a lock-off button is provided.To start the tool, depress the lock-off button and pull theswitch trigger. Release the switch trigger to stop.ASSEMBLYCAUTION:• Always be sure that the tool is switched off and thebattery cartridge is removed before carrying outany work on the tool.Installing or removing saw chainCAUTION:• Always be sure that the tool is switched off and thebattery cartridge is removed before installing orremoving the saw chain.• Always wear gloves when installing or removingthe saw chain.• Use only saw chain and guide bar with bar tipdesigned for this chain saw (see the Extract fromthe spare parts list).• In order to prevent kickback, do not remove thebar tip or replace the guide bar with one without abar tip.Fig.4Loosen the screw by turning counterclockwise the knobuntil the sprocket cover comes off.Remove the sprocket cover.Remove saw chain and guide bar from the tool.Fig.5Fit in one end of the saw chain on the top of guide bar.At this time, fit the saw chain as shown in the figurebecause it rotates in the direction of arrow.Fig.6Place the saw chain so that the spring is positionedinside it and fit in the other end of saw chain around thesprocket as shown in the figure.Fig.7While turning the guide bar counterclockwise, install itso that the end of guide bar contacts the spring.Fig.8Insert the hook of sprocket cover into the hole in the tooland then place the sprocket cover on the tool.Fig.9Turn the knob clockwise to tighten the screw firmly.