Could be a couple problems, is the switch selector fully engaged in hi/low and is the clutch seting set for the proper torque.If both OK then I would have to think that you need a new clutch assembly
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Turn up the clutch dial in front of the chuck with the numbers on it, it may just be set very low
SOURCE: keyless chuck will not tighten down enough to hold bit
What size bit are you using if it is real small it may be below the min sixe require for that chuck .If it is say 1/8 or larger it may be time for a new chuck .They are easy to replace open the chuck as far as you can there is a screw inside them most of them are left hand threads just back it out and tap the chuck loose with a hammer .Make sure you know the threads of your chuck when you buy the new one most are 1/2-20 but some can be 3/8-24 tpi
SOURCE: Can't get the keyless chuck off cordless Makita 6095D drill.
If this is a newer tool it is probably a Torx drive screw usually a T20. The screw is LH thread and after removing it you will need to put some screws back in tool to remove the chuck. First shift the gear selector to the low setting and the clutch to the drill only. Next get a bent handle allen wrench about the capacity of the chuck install the short end of wrench in chuck and tighten. Put the chuck on a block or wood or a workbench to support is and turn the wrench to about a 30 degree angle in the counterclockwise position. The chuck has standard threads so you want to hit the wrench with a hammer to loosen it. This might take a few tries but it will work. Good luck
SOURCE: Dewalt Drill DC728. Chuck came out of drill body
If you find that the end of the screw inside the chuck is actually broke then you have a gear problem inside your drill. This is actually a very common problem. Sometimes people push too hard on their drills and the gears inside wear out and break. This prevent the motor from wearing out, but, the gears have to be replaced.
If it is the gears and not the chuck. you broke the minimium of the front gear or gears inside your drill. YOU CANNNOT repair gears. they need to be replaced. you may be able to find some off brand gears to work but, you run the risk that they are not as strong as your original ones, or may not be exactly grooved correctly.
so, if replacing your chuck does not work. find replacement gears. IF you cannot find the gears from the manufacturer see about replacing your drill.
If the chuck is still good, keep it. If you buy the same model, keep your old drill for replacement parts, ie, switch, armature, cord, etc.
hope this helps somewhat.
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