94. The use of the universal joint or the extension bar some-what reduces the fastening force of the impact wrench.Compensate by fastening for a longer period of time.5. The manner of holding the tool or the material of drivingposition to be fastened will affect the torque.MAINTENANCE CAUTION:• Always be sure that the tool is switched off andunplugged before attempting to perform inspection ormaintenance.Replacing carbon brushesRemove and check the carbon brushes regularly. Replacewhen they wear down to the limit mark. Keep the carbonbrushes clean and free to slip in the holders. Both carbonbrushes should be replaced at the same time. Use only iden-tical carbon brushes.Use a screwdriver to remove the brush holder caps. Take outthe worn carbon brushes, insert the new ones and securethe brush holder caps.To maintain product SAFETY and RELIABILITY, repairs, anyother maintenance or adjustment should be performed byMakita Authorized or Factory Service Centers, always usingMakita replacement parts.ACCESSORIES CAUTION:• These accessories or attachments are recommended foruse with your Makita tool specified in this manual. Theuse of any other accessories or attachments mightpresent a risk of injury to persons. Only use accessory orattachment for its stated purpose.If you need any assistance for more details regarding theseaccessories, ask your local Makita service center.• Sockets• Extension bar• Universal joint1. Limit mark10011451. Brush holder cap2. Screwdriver12004003