7MAINTENANCECAUTION:• 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 carbon brushesshould be replaced. Keep the carbon brushes clean andfree to slip in the holders. Both carbon brushes should bereplaced at the same time. Use only identical carbonbrushes. (Fig. 7)Use a screwdriver to remove the brush holder caps. Takeout the worn carbon brushes, insert the new ones andsecure the brush holder caps. (Fig. 8)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.Remove the crank cap using a Makita lock nut wrench(optional accessory). Rest the tool on the table with the bitend pointing upwards. This will allow the old grease tocollect inside the crank housing. (Fig. 9)Wipe out the old grease inside and replace with a freshgrease (30 g). Use only Makita genuine hammer grease(optional accessory). Filling with more than the specifiedamount of grease (approx. 30 g) can cause faultyhammering action or tool failure. Fill only with thespecified amount of grease. (Fig. 10)Reinstall the crank cap and tighten with the lock nutwrench.CAUTION:• Do not tighten the crank cap excessively. It is made ofresin and is subject to breakage.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• Drill chuck S13• Chuck adapter• Chuck key S13• Hammer grease• Bit grease• Depth gauge• Blow-out bulb• Dust cup• Dust extractor attachment• Safety goggles• Lock nut wrench 28• Plastic carrying caseNOTE:• Some items in the list may be included in the toolpackage as standard accessories. They may differ fromcountry to country.