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My DeWalt DCD791 Kept Stopping Under Pressure — The Battery Wasn't the Whole Story I was installing shelving when my DeWalt DCD791 suddenly started behaving inconsistently. It spun normally in the air, but as soon as I began driving a screw into timber, the motor slowed and stopped. At first, I blamed the battery. It had been used throughout the morning, and the tool's performance seemed to deteriorate as the job progressed. I swapped batteries, expecting an immediate improvement. The drill worked better for a while, but the same problem returned when I used larger screws. That made me reconsider my first diagnosis: perhaps the tool was not actually losing power. It might have been reaching its torque limit or struggling with the way I was using it. The Setting I Had Overlooked I started with the torque adjustment collar. I had been using the drill in screwdriving mode, with the clutch set relatively low. That setting is useful for smaller fasteners, but it can make the drill stop turning once the selected torque limit is reached. The DCD791's instructions explain that the numbered collar controls screwdriving torque, while the drill-bit setting is intended for drilling. I checked the relevant section of the manual at dewalt.manymanuals.com and compared the available settings with the task I was performing. I switched the tool off, allowed it to stop completely and selected a more appropriate setting. For drilling, I would use the drill symbol rather than a low screwdriving clutch setting. For driving screws, I would choose a torque level suited to the fastener and material. That adjustment helped, but I still wanted to make sure the battery was not contributing to the problem. Three Checks That Helped Narrow It Down First, I checked the charge indicator on the battery pack. The lights provide an estimate of the remaining charge, not a guarantee that the pack will deliver full performance under every load. I charged the battery using a compatible DeWalt charger and allowed it to reach the appropriate temperature before testing again. Next, I inspected the bit and chuck. A worn bit can slip in the screw head, making it seem as though the drill is losing power. With the battery removed, I checked the bit for damage and secured it correctly in the chuck. Finally, I tested the tool on a scrap piece of timber with a suitable screw. I applied steady pressure and avoided forcing the drill when resistance increased. The motor ran more consistently, and the screw went in without the repeated stops I had experienced earlier. I could not prove that the torque setting alone had caused every interruption. Battery condition, fastener size, material hardness and bit condition can all affect performance. But the tests showed that I should not assume a failed motor whenever the drill stops under load. My Troubleshooting Routine for a DCD791 When the drill starts cutting out or struggling, I now work through these checks in order: Check the torque setting. A low clutch setting can stop the tool during screwdriving. Select the appropriate setting for the task. Check the gear selector. The DCD791 has two speed ranges. Stop the tool completely before changing gears, and select the range suited to the job. Inspect the bit. A damaged or unsuitable bit may slip and create unnecessary resistance. Test a charged battery. Use a compatible battery and charger. If possible, compare performance with another known-good battery. Avoid forcing the tool. If the drill stalls, release the trigger and identify the cause rather than repeatedly switching it on and off. If the tool continues stopping with a suitable setting, a secure bit and a known-good battery, the fault may involve the switch, motor or internal electronics. I would arrange authorised service rather than opening the tool or attempting an electrical repair. DeWalt DCD791: Quick FAQ Why does my drill run freely but stop when driving screws? It may be reaching the clutch's torque limit, encountering excessive resistance or operating with a battery that cannot supply sufficient power. Check the setting, fastener and battery before suspecting an internal fault. Does a flashing battery indicator always mean the battery is faulty? No. Indicator behaviour varies by battery and charger. Follow the instructions for the specific pack and charger, and have persistent charging faults checked by an authorised service centre. Should I keep pressing the trigger when the drill stalls? No. Release the trigger and determine why the tool stopped. Repeatedly trying to force a stalled drill can damage it and create a safety risk. When does the problem need professional repair? If the drill repeatedly cuts out under normal conditions after the basic checks, or produces unusual smells, excessive heat or abnormal noises, stop using it and arrange qualified inspection. My experience with the DeWalt DCD791 taught me to separate a genuine power problem from a setting or accessory issue. Checking the clutch, gear range, bit and battery in a logical order saved me from assuming that the drill needed an expensive repair.

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