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Keyless Chuck Loosening Problem.

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I use a Hitachi DV 18DGL battery drill for a lot of my work. It is very good and the battery lasts a long time and charges up quickly when needed.


BUT, when in use the keyless chuck comes loose and the drill bit does not turn due to a poor hold. I have two of these drills and the same problem exists with both chucks. Is it a design problem or a bad batch of chucks? I do not know. Other makes of keyless chucks that I have used over the years hold the drill bits securely and do not come loose even if using a hammer action.


Is there a solution? Perhaps I should pour some fine sand into the chucks.


Z.
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  • 0
    If the problem is rounding of the jaws, as happens over time especially once skidding has started, then the chuck can normally be changed - open it up wide and remove the lock-screw whose head is exposed when you look in where the drill bit would go, (normally a left hand thread so don't go mad in the normal loosening direction making it tighter)

    Then close the chuck onto the short leg of the chunkiest Allen key you can fit in the chuck, and strike the long end of the Allen key with a modest hammer or mallet to drive it round to undo it. (when the lock screw is left hand thread, the chuck is normally threaded, again pause and think about diorection before hitting the wrong way.) For anyone wanting to use this trick on drills with gears, engage the lowest speed, so the hammer blow is using the inertia of the motor to work against.

    New chucks are fairly cheap on-line, but be aware there are several thread pitch and diameter variations to chose from and you need the right one for that model.



    Makers exploded diagrams for that model  exploded diagram  show a screw as item 1 and chuck as item 2.

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  • 0
    If the problem is rounding of the jaws, as happens over time especially once skidding has started, then the chuck can normally be changed - open it up wide and remove the lock-screw whose head is exposed when you look in where the drill bit would go, (normally a left hand thread so don't go mad in the normal loosening direction making it tighter)

    Then close the chuck onto the short leg of the chunkiest Allen key you can fit in the chuck, and strike the long end of the Allen key with a modest hammer or mallet to drive it round to undo it. (when the lock screw is left hand thread, the chuck is normally threaded, again pause and think about diorection before hitting the wrong way.) For anyone wanting to use this trick on drills with gears, engage the lowest speed, so the hammer blow is using the inertia of the motor to work against.

    New chucks are fairly cheap on-line, but be aware there are several thread pitch and diameter variations to chose from and you need the right one for that model.



    Makers exploded diagrams for that model  exploded diagram  show a screw as item 1 and chuck as item 2.

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