craftsman cmcd710 drill feels super weak, like it has no power. what's wrong?

Diagnosis

This loss of power in the Craftsman V20 CMCD710 is typically not a motor failure, but a mechanical mismatch between the tool's settings and the resistance of the material. The "weak" feeling usually manifests in one of two ways: either the drill spins fast but stops the moment it hits resistance (slipping), or it spins very slowly and struggles to penetrate the material despite the motor humming loudly. This is almost always caused by the torque clutch being set to a low numerical value or the mechanical gear selector being in the wrong position for the specific application. When the torque collar is set to a low number (e.g., 1 through 5), the internal clutch is designed to "slip" once a specific amount of resistance is met to prevent stripping screw heads or over-driving fasteners. If you are trying to drill a hole or drive a long lag screw with this setting, the drill will feel powerless because the clutch is intentionally disconnecting the motor from the chuck. Conversely, if the gear selector is set to '1' (Low Speed/High Torque) while trying to drive a small screw into soft wood, the tool will feel sluggish and unresponsive. You can confirm this by attempting to drive a screw into a piece of scrap wood; if you hear a rhythmic "clicking" sound while the drill stops advancing, your torque clutch is the culprit.

How to Fix It

To restore full power to your CMCD710, follow these precise mechanical adjustments:

1. Set the Torque Clutch to Maximum: Locate the numbered dial (the collar) directly behind the chuck. Rotate the collar clockwise until the arrow points to the "Drill Bit" icon. This bypasses the clutch mechanism entirely, locking the drive train and delivering 100% of the motor's torque to the bit. Use this setting for all drilling operations.
2. Adjust the Gear Selector: Locate the sliding switch on the top of the tool housing. For high-speed applications (small bits, pre-drilled holes), slide the switch to position '2'. For high-power, slow-speed applications (large auger bits, heavy-duty screws), slide it to position '1'. Ensure the switch clicks fully into place; if it is stuck between gears, the tool will strip the internal planetary gears.
3. Verify Battery Seating: Remove the V20 battery pack and inspect the gold-plated contact terminals for debris or carbon buildup. Slide the battery back in firmly until you hear a loud, definitive click. A loose connection can cause voltage drops that make the motor feel weak under load.
4. Test Trigger Pressure: The CMCD710 features a variable speed trigger. Ensure you are squeezing the trigger fully to the back of the handle to engage the maximum RPM and current draw from the battery.

If That Didn't Work

• Perform a Battery Capacity Test: If the drill feels weak across all settings, your V20 battery may have a dead cell or high internal resistance. Swap the battery with a known-good 2.0Ah or 4.0Ah pack. If the drill regains power, the original battery is degraded and needs replacement.
• Inspect the Chuck for Slippage: Check if the drill bit is actually slipping inside the chuck rather than the motor failing. Tighten the chuck firmly by hand, or use the chuck key if applicable, ensuring the bit is centered and the jaws have gripped the shank tightly.
• Clear Internal Debris: Over time, sawdust and metal shavings can enter the vents of the motor housing, causing the motor to overheat and enter a thermal protection mode. Use a can of compressed air to blow out the motor vents located at the rear and sides of the tool.
• Check for Mechanical Binding: Remove the bit and run the drill. If the chuck spins freely but the tool feels weak with a bit installed, the resistance is coming from the material or a dull bit. Replace your drill bit with a fresh cobalt or titanium-coated bit to reduce friction.

Heads Up

• Avoid "Clutch Burn": Never force the drill to keep spinning when the torque clutch is clicking; this can wear down the internal clutch plates prematurely.
• Gear Switching Safety: Always bring the drill to a complete stop before sliding the gear selector between 1 and 2. Shifting while the motor is spinning can shear the teeth off the planetary gears.
• Heat Management: If the tool becomes hot to the touch, stop immediately. The V20 series has thermal overload protection, but repeatedly pushing the tool to its limit will shorten the lifespan of the brushes and commutator.
• Storage: Store your V20 batteries in a cool, dry place. Extreme cold can significantly reduce the effective discharge rate, making the drill feel "weak" during winter projects.