How To Disassemble A Keyless Chuck Of A Screwdriver

How to remove and disassemble a screwdriver chuck
How to remove a cartridge from a screwdriver: we unscrew and disassemble it with our own hands, select a new one to replace the old one. The description of different ways of fastening the chuck on the shaft is given

How to unscrew a chuck on a screwdriver

This should be done not only in critical situations when urgent repairs are required. Parts need constant lubrication and cleaning, even if they have not been used for a long time. Without preventive maintenance, the tool will quickly fail. It is better to work on it with breaks of several minutes. The bit and motor must be protected from overheating.

Morse taper

In this case, using a hammer, the shank is knocked out of the tapered hole. If this fails, you will have to disassemble the tool and remove the shaft with the chuck from it. Then you will need to remove the clamping cylinder with a pipe wrench. Conventional nuts are rarely used on this assembly.

Hyundai cordless drill

How to unscrew the chuck from the shaft of a drill or screwdriver

To remove the chuck from the tool, you need to fix the shaft and, grasping the chuck by the housing, unscrew it, turning it counterclockwise when viewed from the side of the cams. The main thing is to rip the cartridge off the ground, then it is usually easily unscrewed.

I was lucky, as there were chamfers on the round base of the chuck, which could be well hooked with an open-end wrench # 19. There were no such samples in the replacement cartridge.

how to disassemble a keyless chuck of a screwdriver

After gripping the chuck with an open-end wrench and one sharp blow on the key with a hammer, even without fixing the shaft, as in the photo, the chuck moved from its place. But it turned off tight, and there was a reason for this. I had to continue twisting it with light blows on the key with a hammer.

Looking inside the cartridge, I did not notice the fixing screw because the hole in the head for the star-shaped bit was clogged with dirt, which just had to be removed. Therefore, unscrewing the cartridge, I simultaneously tore off the thread of the fixing screw, it is strange that it did not break off.

If there are no chamfers on the base of the chuck, then you need to clamp a hex bar or an M10-12 bolt with a hex head in its jaws, onto which you put a key and hit it with a hammer. If you cannot screw the cartridge in this way, then you will have to disassemble the drill, remove the shaft with the cartridge, clamp it in a vice and twist it. Instead of an open-end wrench, you can use a pipe wrench by grabbing the chuck by the outside of the housing.

How is it fixeddrill chuck on tool

An external examination of the power tool, it is often not possible to determine in what way the drill chuck is fixed. But if you know the markings, then the mounting method will be determined even with a cursory glance at the cartridge.

Drill chuck markingfastened with a Morse taper

In accordance with GOST 9953-82 “Shortened tool cones. Basic dimensions. ” there are nine standard sizes of Morse cones for fastening drill chucks: B7, B10, B12, B16, B18, B22, B24, B32 and B45. The larger the number after the letter B, the larger the size of the cone.

Now you can easily determine how to install the drill chuck shown in the photo by the markings on it. Obviously, this cartridge is fastened using a Morse taper, size B10. To remove this cartridge from the shaft of the power tool, you will need to knock it down with a hammer.

In the marking in front of B10, numbers 1-6 are also applied. They indicate the range of drill shank diameters that the chuck can clamp.

How to disassemble a self-locking chuck


Classic, refers to the clamping devices of the cam or collet type. They clamp round shank tools and cylindrical workpieces for further processing. The main elements of the cam clamp are as follows:

  • Cylindrical body.
  • An adjusting ring or sleeve that rotates on the outside of the housing.
  • Collet or cam mechanism inside the body.

The material for the manufacture of the elements of the collet mechanism is hardened steel, and the mechanism consists of three identical cams that approach each other when the sleeve or adjusting ring rotates, ensuring the reliability of the shank clamping. In the first models, the cams converged due to the rotation of the adjusting wheel, but now this role belongs to the adjusting sleeve.

The clamps are mounted on one side of the drill shaft, and on the other side a tool is inserted into them, with which the work is done. Jaw chucks are mainly used for fixing:

  • Cutters;
  • Drills;
  • Taps with small shank diameters.

How to disassemble a self-locking chuck