Makita DTW190RTJ Instruction Manual

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8 ENGLISHProper fastening torque for standard bolt1Nm(kgfcm)2020(200)40(410)60(610)80(820)100(1020)120(1220)140(1430)160(1630)180(1840)0 1 2 3M16M14M12M10M8M8M10M12M14M161. Fastening time (second) 2. Fastening torqueProper fastening torque for high tensile bolt10(100)30(310)50(510)70(710)90(920)110(1120)130(1330)00 1 2 312Nm(kgfcm)M12M10M8M10M12M81. Fastening time (second) 2. Fastening torqueNOTE: Hold the tool pointed straight at the bolt or nut.NOTE: Excessive fastening torque may damage thebolt/nut or impact socket. Before starting your job,always perform a test operation to determine theproper fastening time for your bolt or nut.NOTE: If the tool is operated continuously until thebattery cartridge has discharged, allow the tool to restfor 15 minutes before proceeding with a fresh batterycartridge.The fastening torque is affected by a wide variety offactors including the following. After fastening, alwayscheck the torque with a torque wrench.1. When the battery cartridge is discharged almostcompletely, voltage will drop and the fasteningtorque will be reduced.2. Impact socket• Failure to use the correct size impact socketwill cause a reduction in the fastening torque.• A worn impact socket (wear on the hex endor square end) will cause a reduction in thefastening torque.3. Bolt• Even though the torque coefficient and theclass of bolt are the same, the proper fasten-ing torque will differ according to the diame-ter of bolt.• Even though the diameters of bolts are thesame, the proper fastening torque will differaccording to the torque coefficient, the classof bolt and the bolt length.4. The use of the universal joint or the extensionbar somewhat reduces the fastening force of theimpact wrench. Compensate by fastening for alonger period of time.5. The manner of holding the tool or the materialof driving position to be fastened will affect thetorque.6. Operating the tool at low speed will cause a reduc-tion in the fastening torque.MAINTENANCECAUTION: Always be sure that the tool isswitched off and the battery cartridge is removedbefore attempting to perform inspection ormaintenance.NOTICE: Never use gasoline, benzine, thinner,alcohol or the like. Discoloration, deformation orcracks may result.To maintain product SAFETY and RELIABILITY,repairs, any other maintenance or adjustment shouldbe performed by Makita Authorized or Factory ServiceCenters, always using Makita replacement parts.