Makita HP331D Instruction Manual

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9ENGLISHOPERATIONCAUTION: Always insert the battery cartridgeall the way until it locks in place. If you can seethe red part on the upper side of the button, it is notlocked completely. Insert it fully until the red part can-not be seen. If not, it may accidentally fall out of thetool, causing injury to you or someone around you.CAUTION: When the speed comes downextremely, reduce the load or stop the tool toavoid the tool damage.Hold the tool firmly with one hand on the grip and theother hand on the bottom of the battery cartridge tocontrol the twisting action.►Fig.12Screwdriving operationCAUTION: Adjust the adjusting ring to theproper torque level for your work.CAUTION: Make sure that the driver bit isinserted straight in the screw head, or the screwand/or driver bit may be damaged.First, turn the action mode changing ring so that thearrow on the tool body points to the marking.Place the point of the driver bit in the screw head andapply pressure to the tool. Start the tool slowly and thenincrease the speed gradually. Release the switch triggeras soon as the clutch cuts in.NOTE: When driving wood screw, pre-drill a pilot hole2/3 the diameter of the screw. It makes driving easierand prevents splitting of the workpiece.Hammer drilling operationCAUTION: There is a tremendous and sud-den twisting force exerted on the tool/drill bitat the time of hole breakthrough, when the holebecomes clogged with chips and particles, orwhen striking reinforcing rods embedded in theconcrete.First, turn the action mode changing ring so that thearrow on the tool body points to the marking. Theadjusting ring can be aligned in any torque levels forthis operation.Be sure to use a tungsten-carbide tipped drill bit.Position the drill bit at the desired location for the hole,then pull the switch trigger. Do not force the tool. Lightpressure gives best results. Keep the tool in positionand prevent it from slipping away from the hole.Do not apply more pressure when the hole becomesclogged with chips or particles. Instead, run the tool atan idle, then remove the drill bit partially from the hole.By repeating this several times, the hole will be cleanedout and normal drilling may be resumed.Blow-out bulbOptional accessory►Fig.13: 1. Blow-out bulbAfter drilling the hole, use the blow-out bulb to clean thedust out of the hole.Drilling operationFirst, turn the adjusting ring so that the pointer points tothe marking. Then proceed as follows.Drilling in woodWhen drilling in wood, the best results are obtainedwith wood drills equipped with a guide screw. The guidescrew makes drilling easier by pulling the drill bit intothe workpiece.Drilling in metalTo prevent the drill bit from slipping when starting ahole, make an indentation with a center-punch andhammer at the point to be drilled. Place the point of thedrill bit in the indentation and start drilling.Use a cutting lubricant when drilling metals. The excep-tions are iron and brass which should be drilled dry.CAUTION: Pressing excessively on the toolwill not speed up the drilling. In fact, this excessivepressure will only serve to damage the tip of your drillbit, decrease the tool performance and shorten theservice life of the tool.CAUTION: Hold the tool firmly and exert carewhen the drill bit begins to break through theworkpiece. There is a tremendous force exerted onthe tool/drill bit at the time of hole break through.CAUTION: A stuck drill bit can be removedsimply by setting the reversing switch to reverserotation in order to back out. However, the toolmay back out abruptly if you do not hold it firmly.CAUTION: Always secure small workpiecesin a vise or similar hold-down device.CAUTION: If the tool is operated continuouslyuntil the battery cartridge has discharged, allowthe tool to rest for 15 minutes before proceedingwith a fresh battery.Using the tool as a hand screwdriver►Fig.14Switch off the tool.Move the reversing switch lever to the neutral position.Turn the action mode changing ring so that the arrowpoints to the marking.Turn the tool.NOTE: This use is convenient for checking thescrewdriving.NOTE: Do not use the tool for work requiring exces-sive force, such as tightening bolt or removing rustedscrews.