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A cordless drill that will not do its job usually has one of three problems: the bit is slipping in the chuck, the entire chuck is loosening from the drill, or the bit is secure but the clutch is slipping before the screw reaches the desired depth. Those symptoms look similar at first, but they involve different parts and require different fixes. Remove the battery before inspecting anything, then use the symptom-based checks below.
Identify exactly what is moving
Watch the drill and bit at low speed with the trigger released between checks. The location of the movement tells you where to work.
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| What you observe | What is probably happening | Where to start |
|---|---|---|
| The bit rotates unevenly, falls out, or spins inside the jaws. | The chuck is not gripping the bit. Debris, uneven seating, a damaged or worn bit, damaged jaws, or an oversized shank can be responsible. | Remove the battery, inspect and clean the chuck, then reseat a suitable bit. |
| The whole chuck shifts, backs off, or turns relative to the drill spindle. | The chuck-to-spindle attachment may be loose. A loose securing screw is one possible cause. | Use the exact model manual or manufacturer service instructions before attempting an attachment repair. |
| The bit stays firmly held, but the screw stops, clicks, or will not advance. | The clutch may be slipping at its preset torque, or the direction, mode, speed, bit, or load may be wrong. | Check forward/reverse, mode, speed, and clutch settings; test on scrap material. |
A chuck controls bit retention. A clutch controls the torque delivered while driving. Confusing those two mechanisms leads to the wrong repair.
Make the drill safe before checking it
- Release the trigger and wait for all rotation to stop.
- Remove the battery pack. Yard Force’s safety guidance specifically says not to inspect or clean the drill with the battery installed.
- Place the drill on a stable surface and keep the bit pointed away from your hands.
- Do not hold the trigger while tightening, cleaning, or changing a bit.
If the drill stalls under load, release the trigger immediately and pull the bit out of the work. DEWALT warns against repeatedly pulsing a stalled drill; doing so can overheat or damage the tool.
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When the bit slips inside the chuck
Inspect the chuck bore and jaws
With the battery removed, open the chuck fully and look into the bore. Dust, wood chips, metal swarf, and other debris can keep the jaws from closing evenly. Check that each jaw travels smoothly and meets the shank squarely. Clean loose contamination carefully with a dry brush or cloth appropriate for the tool; do not force a damaged jaw back into position.
Close the empty chuck partway and observe the jaws. They should move together rather than one jaw stopping early. A jaw that is visibly chipped, bent, or out of line is a mechanical problem, not a tightening technique problem.
Seat the bit straight and within capacity
Use a bit whose shank falls within the chuck’s rated capacity. Insert it far enough for all jaws to grip the shank, but do not bury a short bit so deeply that the jaws catch only its tapered section. Keep the bit centered while tightening. A bit held at an angle can appear tight yet wobble or work loose as soon as torque is applied.
For a screwdriver bit, the jaws must grip the hexagonal shank, not just the tip or a narrow transition. If you use a bit holder, make sure the holder itself is the part secured by the chuck and that the bit is fully seated in the holder.
Tighten according to the chuck design
Keyless chucks are tightened by hand, but the required action varies by model. Tighten the chuck through its full gripping range until the mechanism is secure. A Milwaukee operator manual describes tightening until the chuck ratchets; use that as a model-specific instruction only when it matches your drill’s design. Follow your own manual if its procedure differs.
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After tightening, hold the drill with the bit clear of the work and run it briefly at low speed. Stop if the bit wobbles, walks out, or the jaws open. Do not compensate for a failing chuck by gripping the chuck with pliers while the motor runs.
Check the bit itself
A worn, rounded, bent, or damaged shank gives the jaws less usable surface to grip. Replace a suspect bit with a straight, undamaged bit of the correct size and shank type. A different brand of bit is not automatically incompatible; the important checks are shank shape, diameter, condition, and suitability for the chuck. The reader question about a relatively new Bosch Easyimpact 600 and older bits illustrates why bit condition should be checked, but it does not establish that brand mismatch is the cause.
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If several suitable bits slip after the chuck has been cleaned and each one is centered and tightened correctly, the chuck may be worn. Typical clues are jaws that no longer meet evenly, a bit that can be pulled out by hand after normal tightening, or persistent runout with straight bits. The available manufacturer guidance does not establish a universal chuck replacement procedure or a common part number. Chuck mounting, thread or taper, capacity, and securing hardware depend on the drill model.
When the entire chuck loosens from the drill
This symptom is different from a bit slipping between the jaws. If the chuck body moves relative to the drill housing or spindle, inspect the chuck-to-spindle attachment rather than repeatedly tightening the jaws.
Check for a securing screw only as the manual directs
Manufacturer support identifies a loose chuck securing screw as one possible cause. The screw’s location, drive type, thread direction, and removal procedure vary. Some drills require a particular chuck position or spindle-lock method, and forcing the wrong fastener can damage the spindle or chuck.
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- Identify the exact model number from the drill label or manual.
- Read the manufacturer’s chuck-removal or service section for that model.
- Compare the described hardware with what is actually fitted before turning a screw.
- If the manual does not authorize user service, use an authorized repair route instead of improvising.
Do not assume a generic replacement chuck will fit. Even if the replacement appears to have the same outside diameter, its mounting and capacity may differ.
When the bit is secure but the screw will not advance
Confirm forward direction
Check the direction selector before changing any mechanical parts. A drill set to reverse may remove a screw or simply refuse to drive it deeper, depending on the fastener and material. Move the selector fully into the forward position with the trigger released, then test again.
Use the correct operating mode
Many cordless drills provide separate clutch positions and a drill mode. A clutch position is intended to stop delivering torque at a selected level; drill mode is intended for drilling and, on some models, higher unrestricted torque. Select the mode specified in your manual for the fastener and material. Do not use a hammer or impact setting for a task the bit or fastener is not designed to withstand.
Understand why the clutch clicks
A clutch that slips is not necessarily broken. Milwaukee’s operator manual explains: “The adjustable clutch, when properly adjusted, will slip at a preset torque to prevent driving the screw too deep into different materials and to prevent damage to the screw or tool.” A low setting can therefore stop a screw before its head is seated.
Raise the clutch setting gradually, one step at a time, and test on a piece of scrap or an inconspicuous area. Stop when the screw reaches the required depth without stripping. If your model provides a dedicated drill position, use it only where the material and fastener call for the additional torque and your manual permits that use.
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Control speed and pressure
For screwdriving, BLACK+DECKER recommends the lower speed range. Start the screw slowly so the bit stays aligned with the recess, then increase speed only as the threads have engaged. Excessive speed can cam out the bit or strip the screw head before the clutch reaches its intended limit.
Keep the drill in line with the screw. Side loading creates friction and can make a correctly set clutch appear weak. Use a bit that matches the screw recess exactly; a worn or undersized driver bit can spin in the head even when the chuck is holding it properly.
Consider the material and load
A screw may stop because the material presents more resistance than the selected torque can overcome. A pilot hole, the correct screw type, or a shorter fastener may be appropriate, but choose those changes for the material and application rather than forcing the drill. If the motor slows sharply or stalls, release the trigger, remove the bit, and investigate instead of repeatedly pulsing it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A safe diagnostic sequence
Use this order to avoid replacing parts before isolating the symptom.
- Remove the battery. Never inspect or clean the chuck with power connected.
- Classify the movement. Decide whether the bit slips in the jaws, the whole chuck moves, or the bit remains secure while the screw stops.
- For jaw slip, inspect and clean. Look for debris, damaged jaws, and uneven jaw travel.
- Install a known-good bit. Keep it within chuck capacity, centered, straight, and inserted far enough for full jaw contact.
- Tighten using the model’s procedure. If the chuck still releases the bit, stop using it for torque work.
- For a loose chuck body, consult the model service information. Check a securing screw only when the instructions identify its location and method.
- For a secure bit that will not drive, check controls. Verify forward direction, operating mode, speed range, and clutch setting.
- Test on scrap. Increase clutch torque gradually and use low speed for screwdriving.
- Stop at a stall. Release the trigger immediately, remove the bit from the work, and correct the cause before trying again.
When to repair, replace, or stop using the drill
Clean and continue when the problem is simple
Cleaning and correct seating are reasonable first-line fixes when debris, an angled bit, or an unsuitable shank caused the slip. Confirm the result with more than one suitable bit and a brief low-speed test.
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Service the chuck when grip remains unreliable
A chuck that cannot hold multiple undamaged bits after cleaning is not reliable for drilling or driving. Obtain a replacement chuck compatible with the exact drill model, mounting method, and capacity, or have the manufacturer’s service operation performed. Compatibility must be confirmed before purchase; a category description alone is not enough.
Replace bits when their shanks or tips are worn
A hex-shank screwdriver bit set can solve a worn-bit problem when the chuck itself is healthy. It cannot repair damaged jaws or a loose chuck attachment. Match the bit profile to the fastener and retire bits with rounded corners, twisted shanks, or visibly chipped tips.
Use professional service for uncertain attachment faults
If the chuck-to-spindle connection is loose and the manual does not provide a clear user procedure, stop using the drill and seek model-specific service. The evidence does not support one universal removal method, and an incorrect repair can make the tool unsafe.
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Common mistakes that make the symptom worse
- Changing bits with the battery installed: an accidental trigger press can start the motor while your fingers are near the jaws.
- Blaming the clutch for jaw slip: clutch adjustments cannot make a damaged or contaminated chuck grip a bit.
- Setting the clutch to maximum immediately: this can drive screws too deep or damage the screw before you establish the required torque.
- Using pliers on a spinning chuck: this can damage the chuck and create a hand-injury hazard.
- Pulsing a stalled drill: repeated trigger hits do not clear the underlying overload and can overheat the tool.
- Ordering a universal-looking chuck: mounting and capacity are model-dependent, so verify the exact drill information first.
- Assuming a different bit brand is the cure: inspect shank size, shape, wear, and seating before treating brand as relevant.
What the symptoms tell you
A bit that physically moves in the jaws points to chuck cleanliness, jaw condition, bit seating, or bit wear. A chuck that moves as a unit points to its spindle attachment and possible securing hardware. A stationary bit with a screw that stops under load points first to direction, mode, speed, clutch setting, bit engagement, or excessive resistance. Following that order keeps a simple adjustment from turning into an unnecessary parts replacement and keeps an uncertain mechanical fault out of service until it can be handled safely.
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