Makita DHR241ZJ Instruction Manual

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8Position the bit at the desired location for the hole, thenpull the switch trigger.Do not force the tool. Light pressure gives best results.Keep the tool in position and prevent it from slipping awayfrom the hole.Do not apply more pressure when the hole becomesclogged with chips or particles. Instead, run the tool at anidle, then remove the bit partially from the hole. Byrepeating this several times, the hole will be cleaned outand normal drilling may be resumed.CAUTION:• There is a tremendous and sudden twisting forceexerted on the tool/bit at the time of hole break-through, when the hole becomes clogged with chipsand particles, or when striking reinforcing rodsembedded in the concrete. Always use the side grip(auxiliary handle) and firmly hold the tool by both sidegrip and switch handle during operations. Failure to doso may result in the loss of control of the tool andpotentially severe injury.NOTE:Eccentricity in the bit rotation may occur while operatingthe tool with no load. The tool automatically centers itselfduring operation. This does not affect the drillingprecision.Blow-out bulb (optional accessory)(Fig. 17)After drilling the hole, use the blow-out bulb to clean thedust out of the hole.Chipping/Scaling/Demolition (Fig. 18)Set the action mode changing knob to the symbol.Hold the tool firmly with both hands. Turn the tool on andapply slight pressure on the tool so that the tool will notbounce around, uncontrolled. Pressing very hard on thetool will not increase the efficiency.Drilling in wood or metal (Fig. 19 & 20)Use the optional drill chuck assembly. When installing it,refer to “Installing or removing the bit” described on theprevious page. Set the action mode changing knob so thatthe pointer points to the symbol.CAUTION:• Never use “rotation with hammering” when the drillchuck assembly is installed on the tool. The drill chuckassembly may be damaged. Also, the drill chuck willcome off when reversing the tool.• Pressing excessively on the tool will not speed up thedrilling. In fact, this excessive pressure will only serveto damage the tip of your bit, decrease the toolperformance and shorten the service life of the tool.• There is a tremendous twisting force exerted on thetool/bit at the time of hole breakthrough. Hold the toolfirmly and exert care when the bit begins to breakthrough the workpiece.• A stuck bit can be removed simply by setting thereversing switch to reverse rotation in order to backout. However, the tool may back out abruptly if you donot hold it firmly.• Always secure small workpieces in a vise or similarhold-down device.MAINTENANCECAUTION:• Always be sure that the tool is switched off and thebattery cartridge is removed before attempting toperform inspection or maintenance.• Never use gasoline, benzine, thinner, alcohol or thelike. Discoloration, deformation or cracks may result.Replacing carbon brushes (Fig. 21)Remove and check the carbon brushes regularly.Replace when they wear down to the limit mark. Keep thecarbon brushes clean and free to slip in the holders.Both carbon brushes should be replaced at the sametime. Use only identical carbon brushes.Use a screwdriver to remove the brush holder caps.Take out the worn carbon brushes, insert the new onesand secure the brush holder caps. (Fig. 22)To maintain product SAFETY and RELIABILITY, repairs,any other maintenance or adjustment should beperformed by Makita Authorized Service Centers, alwaysusing Makita replacement parts.OPTIONAL ACCESSORIESCAUTION:• These accessories or attachments are recommendedfor use with your Makita tool specified in this manual.The use of any other accessories or attachments mightpresent a risk of injury to persons. Only use accessoryor attachment for its stated purpose.If you need any assistance for more details regardingthese accessories, ask your local Makita Service Center.• SDS-Plus Carbide-tipped bits• Bull point• Cold chisel• Scaling chisel• Grooving chisel• Drill chuck assembly• Drill chuck S13• Chuck adapter• Chuck key S13• Bit grease• Side grip• Depth gauge• Blow-out bulb• Dust cup• Dust extractor attachment• Safety goggles• Plastic carrying case• Keyless drill chuck• Various type of Makita genuine batteries and chargersNOTE:• Some items in the list may be included in the toolpackage as standard accessories. They may differfrom country to country.Noise ENG905-1The typical A-weighted noise level determined accordingto EN60745:Sound pressure level (LpA ): 86 dB (A)Sound power level (LWA): 97 dB (A)Uncertainty (K): 3 dB (A)Wear ear protection.