Change the chuck with the correct rotation

The design of drill chucks is designed to provide support and stability during the drilling process itself. When changing this automatism is exploited in the opposite direction. Depending on the type of chuck, additional loosening of a retaining screw or unscrewing from a retaining thread may be required.

Loosen in case of resistance

The chuck consists of the "jaws" holding the drill. In most conventional chuck types without quick clamping technology, they fall out of the drill head almost automatically after sufficient opening. Turning clockwise opens the chuck.

If there is a retaining screw in the chuck, the chuck must be opened as far as possible. In the middle at the bottom of the opening in the drill head is a screw with Phillips head. With a suitable screwdriver, the screw can also be loosened clockwise and unscrew.

If the chuck jams after opening and if necessary removing the screw, an Allen wrench helps to loosen and remove. Trials introduce the largest hex wrench that fits into the open chuck. By turning clockwise, the chuck closes around the Allen key and the "jaws" pack.

The Allen key is pulled out. If it sits too tightly in the chuck, millimeter-by-mill loosening turns counterclockwise. Then the allen is re-inserted so that the leg or handle is in a position that allows for hammer blows, causing the counter-clockwise rotation. One or two moderately hard blows loosen the chuck.

After a further slight opening by turning clockwise, the chuck can now be disassembled easily by pulling out the Allen key. For very old soiled or rusted chucks, the jaws can fall out one by one and only one after the other. The removal of stubborn jaws can be facilitated or facilitated by shaking or lightly striking the drill head with a rubber mallet.

Insert new chuck and fasten

The empty chuck channel in the drill head can be cleaned by careful tapping and rusting by spraying with rust remover. Before swapping, the size of the drill chuck should be determined in order to purchase a suitable replacement part. Either the dimension can be found on the type plate or can be read by the machine type in the operating manual, also online. Almost all drills bought in Germany over the past fifty years have three-eighths or half-inches as sizes.

The new drill chuck is inserted into the channel and fixed with the opposite directions of rotation of the movements applied during removal. With manual power, it is used closed in a counterclockwise direction. If a retaining screw is present, the placed drill chuck is opened clockwise so far that the screw can be inserted and locked counterclockwise.

Tips & Tricks

Do not be intimidated by the old age or the resistance of an old drill chuck. Drills can handle several medium hammer blows.

Video Board: Drill Repair - Replacing the Chuck (DeWALT Part # N196034)