Makita HR4500C Instruction Manual

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Contents

8Depth gauge (Fig. 14)The depth gauge is convenient for drilling holes of uni-form depth. Loosen the clamp screw and adjust thedepth gauge to the desired depth. After adjusting, tightenthe clamp screw firmly.NOTE:• The depth gauge cannot be used at the position wherethe depth gauge strikes against the gear housing/motorhousing.OPERATIONHammer drilling operation (Fig. 15)Set the change lever to the symbol.Position the bit at the desired location for the hole, thenpull the switch trigger. Do not force the tool. Light pres-sure gives best results. Keep the tool in position and pre-vent it from slipping away from 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:• When the bit begins to break through concrete or if thebit strikes reinforcing rods embedded in concrete, thetool may react dangerously. Maintain good balance andsafe footing while holding the tool firmly with bothhands to prevent dangerous reaction.Blow-out bulb (optional accessory) (Fig. 16)After drilling the hole, use the blow-out bulb to clean thedust out of the hole.Chipping/Scaling/Demolition (Fig. 17)Set the change lever 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.MAINTENANCECAUTION:• Always be sure that the tool is switched off andunplugged before attempting to perform inspection ormaintenance.• Never use gasoline, benzine, thinner, alcohol or thelike. Discoloration, deformation or cracks may result.Replacing carbon brushesWhen the resin insulating tip inside the carbon brush isexposed to contact the commutator, it will automaticallyshut off the motor. When this occurs, both carbonbrushes should be replaced. Keep the carbon brushesclean and free to slip in the holders. Both carbon brushesshould be replaced at the same time. Use only identicalcarbon brushes. (Fig. 18)Use a screwdriver to remove the brush holder cover.(Fig. 19)Use a screwdriver to remove the brush holder caps. Takeout the worn carbon brushes, insert the new ones andsecure the brush holder caps. (Fig. 20)LubricationThis tool requires no hourly or daily lubrication because ithas a grease-packed lubrication system. Lubricate thetool every time the carbon brushes are replaced.Run the tool for several minutes to warm it up. Switch offand unplug the tool.Loosen the six screws and remove the handle. Note thatthe top screws are different from other screws. (Fig. 21)Disconnect the connector by pulling it. (Fig. 22)Remove the crank cap using a hex wrench. Rest the toolon the table with the bit end pointing upwards. This willallow the old grease to collect inside the crank housing.(Fig. 23)Wipe out the old grease inside and replace with a freshgrease (60 g). Use only Makita genuine hammer grease(optional accessory). Filling with more than specifiedamount of grease (approx. 60 g) can cause faulty ham-mering action or tool failure. Fill only with the specifiedamount of grease. (Fig. 24)Reinstall the crank cap and tighten with the hex wrench.Connect the connector and reinstall the handle. (Fig. 25)CAUTION:• Do not tighten the crank cap excessively. It is made ofresin and is subject to breakage.• Be careful not to damage the terminals or lead wiresespecially when wiping out the old grease or installingthe handle.To maintain product SAFETY and RELIABILITY, repairs,any other maintenance or adjustment should be per-formed by Makita Authorized Service Centers, alwaysusing Makita replacement parts.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-Max Carbide-tipped bits• SDS-Max bull point• SDS-Max cold chisel• SDS-Max scaling chisel• SDS-Max tile chisel• SDS-Max clay spade• Hammer grease• Bit grease• Side handle• Side grip• Depth gauge• Blow-out bulb• Safety goggles• Carrying case