Changing the drill chuck

Pull the plug out of the socket before carrying out any work on the power tool.

If your power tool does not have a drill spindle locking mechanism, you must have the drill chuck changed by an authorised after-sales service centre for Bosch power tools.

Removing the Drill Chuck (see figure E)

Remove the auxiliary handle (7).

Insert a steel pin with a diameter of 5 mm and a length of approx. 50 mm into the hole on the spindle collar to lock the drill spindle in place. Clamp a hex key (13) in the keyless chuck (1), leading with the short shaft.

Place the power tool on a firm surface, e.g. a work bench. Hold the power tool firmly and loosen the keyless chuck (1) by turning the hex key (13) in rotational direction ➊.

If the keyless chuck is stuck, there are two different ways to loosen it. To do this, a high torque (> 75 Nm) must be applied for a short period of time. This can be achieved either by lightly tapping the long shaft of the hex key (13), or by extending the lever of the hex key (13) using a tube (approx 40 cm).

Remove the hex key from the keyless chuck and completely unscrew the keyless chuck from the power tool.

Fitting the Drill Chuck (see figure F)

To fit the keyless chuck (1), perform the same steps in reverse order.

After successfully fitting the drill chuck, remove the steel pin from the hole again.

The drill chuck must be tightened using a tightening torque of approx. 30–35 Nm.