Makita 6990D Instruction Manual

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5• Do not use force when inserting the battery cartridge. Ifthe cartridge does not slide in easily, it is not beinginserted correctly.Installing or removing bitImportant:Always be sure that the tool is switched off and the bat-tery cartridge is removed before installing or removingthe bit.Use only the driver bit or socket bit shown in the figurebelow.Do not use any other driver bit or socket bit.To install the bit, pull the sleeve in the direction of thearrow and insert the bit into the sleeve as far as it will go.Then release the sleeve to secure the bit. (Fig. 2)To remove the bit, pull the sleeve in the direction of thearrow and pull the bit out firmly.NOTE:If the bit is not inserted deep enough into the sleeve, thesleeve will not return to its original position and the bit willnot be secured. In this case, try re-inserting the bitaccording to the instructions above.Switch action (Fig. 3)CAUTION:Before inserting the battery cartridge into the tool, alwayscheck to see that the switch trigger actuates properly andreturns to the “OFF” position when released.To start the tool, simply pull the trigger. Tool speed isincreased by increasing pressure on the trigger. Releasethe trigger to stop.Reversing switch action (Fig. 4)CAUTION:• Always check the direction of rotation before operation.• Use the reversing switch only after the tool comes to acomplete stop. Changing the direction of rotationbefore the tool stops may damage the tool.• When not operating the tool, always set the reversingswitch lever to the neutral position.This tool has a reversing switch to change the directionof rotation. Depress the reversing switch lever from the Aside for clockwise rotation or from the B side for counter-clockwise rotation. When the switch lever is in the neutralposition, the switch trigger cannot be pulled.Operation (Fig. 5 & 6)The proper fastening torque may differ depending uponthe kind or size of the screw/bolt, the material of theworkpiece to be fastened, etc. The relation between fas-tening torque and fastening time is shown in Fig. 5 forstandard bolt or Fig. 6 for high tensile bolt.Hold the tool firmly and place the point of the driver bit inthe screw head. Apply forward pressure to the tool to theextent that the bit will not slip off the screw and turn thetool on to start operation.NOTE:• When fastening screw M8 or smaller, carefully adjustpressure on the switch trigger so that the screw is notdamaged.• Hold the tool pointed straight at the screw.• If you tighten the screw for a time longer than shown inthe figures, the screw or the point of the driver bit maybe overstressed, stripped, damaged, etc. Before start-ing your job, always perform a test operation to deter-mine the proper fastening time for your screw.The fastening torque is affected by a wide variety of fac-tors including the following.After fastening, always check the torque with a torquewrench.1. When the battery cartridge is discharged almostcompletely, voltage will drop and the fasteningtorque will be reduced.2. Driver bit or socket bit Failure to use the correct sizedriver bit or socket bit will cause a reduction in thefastening torque.3. Bolt• Even though the torque coefficient and the class ofbolt are the same, the proper fastening torque willdiffer according to the diameter of bolt.• Even though the diameters of bolts are the same,the proper fastening torque will differ according tothe torque coefficient, the class of bolt and the boltlength.4. The manner of holding the tool or the material ofdriving position to be fastened will affect the torque.5. 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 and the bat-tery cartridge is removed before carrying out any work onthe tool.Replacement of carbon brushes (Fig. 7 & 8)Replace carbon brushes when they are worn down to thelimit mark. Both identical carbon brushes should bereplaced at the same time.To maintain product safety and reliability, repairs, mainte-nance or adjustment should be carried out by a MakitaAuthorized Service Center.