Makita DTW250 Instruction Manual

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Contents

Makita DTW250 Instruction Manual Manual pdf 8 page image

8 ENGLISH0High tensile boltN m(kgf cm)Fastening torqueFastening time (S)Proper fastening torque160(1,632)140(1,428)120(1,224)100(1,020)80(816)60(612)40(408)20(204)180(1,836)200(2,040)1.0 2.0 3.0M14M14M12M12M10M10NOTE:• Hold the tool pointed straight at the bolt or nut.• Excessive fastening torque may damage thebolt/nut or socket. Before starting your job,always perform a test operation to determine theproper fastening time for your bolt or nut.• If the tool is operated continuously until thebattery cartridge has discharged, allow the toolto rest for 15 minutes before proceeding with afresh battery cartridge.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. Socket• Failure to use the correct size socket willcause a reduction in the fastening torque.• A worn socket (wear on the hex end orsquare 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 is switched off andthe battery cartridge is removed before attempt-ing to perform inspection or maintenance.• Never use gasoline, benzine, thinner, alcoholor the like. Discoloration, deformation or cracksmay result.Replacing carbon brushes► Fig.11: 1. Limit markReplace when they wear down to the limit mark. Keepthe carbon 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 two screws then removethe rear cover.► Fig.12: 1. Rear cover 2. ScrewsRaise the arm part of the spring and then place it in therecessed part of the housing with a slotted bit screw-driver of slender shaft or the like.► Fig.13: 1. Spring 2. Arm 3. Recessed partUse pliers to remove the carbon brush caps of thecarbon brushes. Take out the worn carbon brushes,insert the new ones and replace the carbon brush capsin reverse.► Fig.14: 1. Carbon brush cap► Fig.15: 1. Hole 2. Carbon brush capMake sure that the carbon brush cap have fit into theholes in brush holders securely.Reinstall the rear cover and tighten two screwssecurely.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.