Digital Zeus™ HVAC Tool & Instruments Journal

Removing a Cordless Drill Chuck

A lot of cordless drills require the removal of the chuck for repairs, especially when repairing the gearbox or torque selector collar. This little guide should help. Please remember that these instructions only work for threaded-on chucks and not taper-fit chucks (almost all cordless drills have threaded chuck spindles). Use caution and common sense.

Remove the chuck screw

In many drills there is a small screw deep inside the jaws of the chuck. This screw helps hold the chuck onto the spindle during operation, preventing it from spinning off. Check to see if you have a screw inside your chuck’s jaws. Depending on the brand and model of your drill, you may have to use an allen key, torx driver, or a flat-head screwdriver to remove the screw. The most important thing to remember is this: the chuck screw is reverse-thread. You will have to spin the screw clockwise to remove it. This reverse threading helps to act against the torque of the drill and keep the screw tightly connected.

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Brushes or Switch

Power tool is running intermittently. One minute it’s working fine, just like it always did, and the next it’s completely dead. Click the trigger a few times and it’s running again. What’s going on?

While there are many problems that can cause intermittent power tool operation, the two most common failures are the switch and the brushes. You’re probably already familiar with these parts. The switch usually sits behind the main trigger, controlling power flow from the wall to the tool. The carbon brushes actually transfer power to the tool’s motor. It can be difficult to determine which failure you’re experiencing because both the brushes and the switch deal with electrical connections within the tool.

There are clues which can help you find the problem.

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