Drill due to ventilation, dust inside the long-term use very much, gear and bearing lubricants cause dust (sleeve) on a dry mix deterioration increased wear, particularly the use of alternative even more. Rotary drill precision security, reducing as bearing (sleeve) and excessive wear of the gap, so the need to keep a very clean interior and greasing lubrication.
        Methods:
        Loosen the outer drill a few self-tapping screws or nails; opened flat to half of the housing; generally hand drill new structure is a semi-recessed, that all mechanical and electrical components are means in the other half shell;
        Carefully remove the first brush, then won the drill chuck side, then gently lift the motor rotor removed (not bruised enameled), wipe clean the commutator (with carbon brush that is in contact) on the rotor, if dirty or badly worn first with sandpaper or emery cloth polished with water metallographic sandpaper to light.
        Rotor before and after the bearing if it is sealed to the outside can be wiped clean, if the seal is broken should be promptly replaced. The helical axis of the rotor before wiped clean.
        The casing of the oil clean wipe clean. The drill chuck rod helical gears and bearings at both ends (or sleeve) clear wiped clean.
        Removing the stuff Replacing first installed rotor; refill drill chuck helical gear lever; loading brush, brushes if less than 7-8 mm should be promptly renewed. Brush installed to flatten, finally found a little "Mobil" or "Shell" grease is applied between the gears and bearings (or sleeve) to all parts installed flatten check the correct cover to the other half, tighten the screw turned by hand without catching the feeling, it can turn power on again.