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I recently bought a Bosch PSB 500 RE power drill and already I kinda screwed up the machine.

The chuck is keyless, consisting of two parts which I'll refer to as the head and the base. You would hold the base and rotate the head relative to the base to loosen or tighten the bit.

The machine is also equipped with a grip that is located on the drill body just before the base of the chuck.

While drilling this grip slipped and caught the base, stopped it from turning, so that only the head of the chuck was turning in the grip direction.

Now the whole chuck is too tight and it seems I can't release the bit any more. Any solutions?

Edit 1

I tried wearing gloves, it didn't help. I also tried putting some WD40, but that didn't help because the bit is way too tight.

I heard that the chuck assembly can be replaced, what do you think?

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Don't replace the chuck assembly, it can't be that desperate yet. Did you try BMitch's strap wrench suggestion? You could also use locking or groove joint pliers with a heavy cloth or rubber sheet to protect the chuck finish. Even if the finish is damaged, the chuck will still function, but you may need to always use gloves on it because the damaged surface will be too harsh for bare skin. If the drill doesn't torque enough to loosen the chuck, you may need to use two tools to get it to loosen. It will loosen with the right tools. –  bcworkz Jan 19 '13 at 20:28
    
You'd need to unscrew a screw that is accessible only when the bit is removed to replace the chuck. –  sharptooth Jan 22 '13 at 7:35
    
@sharptooth my drill machine definitly does not have a screw that is covered by the bit, maybe in other models. check my amazon link –  Moataz Elmasry Jan 22 '13 at 13:51
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Strange. The typical procedure is like in this video youtube.com/watch?v=usC8unA5RiA - you loosen the chuck open wide and then unscrew a screw inside. –  sharptooth Jan 22 '13 at 14:05
    
nop I believe this is dependant on the model. mine most probably does not have this one –  Moataz Elmasry Jan 22 '13 at 15:49
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5 Answers 5

up vote 14 down vote accepted

Put the drill in reverse, firmly grip the chuck (the part you were calling the head) and gently squeeze the trigger up the point that you cannot hold on. If you hear clicking, and it doesn't torque very much, you need to turn the torque setting up to the maximum (the highest number, or the drill setting if it has one). If it still doesn't budge and you're not able to hold the chuck against the force of the drill, you may want to use something stronger than your hand to hold the chuck. A strap wrench is well designed for this task and won't damage the chuck.

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I will try and get one of these strap wrenches and try again. I tried to use my bare hands as well as a piece of cloth to hold the chuck base and tried to turn on the drill in the release direction, but I have to admit that I'm not strong enough for that :(, so I'll try the strap wrench. many thanks –  Moataz Elmasry Jan 22 '13 at 13:49
    
I had no idea of strap wrenches before reading this. –  sharptooth Jan 22 '13 at 14:09
    
I've had success with channellock pliers. They usually leave marks on the chuck, but they're also more common than strap wrenches. –  alx9r Jan 23 '13 at 6:51
    
@alx9r: They won't damage the chuck if the chuck is wrapped in cloth. –  sharptooth Jan 23 '13 at 7:32
    
A less dangerous way (Especially as there's still a bit in there)is with a bench vice and pliers/wrench (so no power is used) –  Mark W Aug 23 '13 at 10:28
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I have a strap wrench set but not nearby, didn't want to go buy another, and needed the drill bit changed soon. After reading this thread with several good suggestions, the only things I had on hand to try were a pair of rubber gloves--not enough alone for me either--but I also got the idea of wrapping two thick rubber bands, which I did have, around the drill chuck pieces. Combining that with the rubber gloves was enough to improve the grip so I could loosen the chuck. Worth a try before heading for the store.

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I had this problem after the first serious use of a drill I bought (judging by the resistance, I believe I was drilling into concrete). I tried using the drill in reverse and various other suggestions I saw on the internet but had no luck. What I ended up resorting to was to buy a "Draper 43863 2-Piece Soft-Grip Strap Wrench Set" from Amazon (I think there are other brands and other vendors, which may well be as good or better). It worked a treat. Given the purchase on the keyless chuck that I managed to get, I can't think I would have been able to release the drill bit otherwise. (Retrospectively, I don't think I should have bought such a powerful drill with a keyless chuck).

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Hold the base part of the drill chuck with your hand. Hit to the head of the drill chuck with a hammer in the direction you would turn the head to remove. You would want to hit in the direction of the rotation, so you would scrape the chuck rather than hitting it directly. Narrower headed hammers and chucks with cavities on the sides that you can catch with your hammer will work better. This method WILL damage your drill chuck cosmetically, but I have yet to face a functional problem with it.

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Nope, this will likely damage the plastic chuck exterior big time and if you repeat that you'll likely get all the plastic stripped and the result will be really ugly and not very usable. –  sharptooth Jan 22 '13 at 10:22
    
I have to agree with sharptooth, but this is too brutal –  Moataz Elmasry Jan 22 '13 at 13:48
    
Driving a motor while preventing it from rotating is potentially more risky. However, I agree that using my method requires finesse. –  palpa Jan 22 '13 at 16:05
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That happens once in a while with such chucks. Been there, loosened that. Don't worry.

When all else fails I wrap the chuck ring in cloth and use a pipe wrench. Sometimes only more torque can help. Just be sure you're turning it in the right direction.

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Vice grips may also be used, if they're the only thing at hand. –  Wayfaring Stranger Apr 16 at 13:44
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