Disassemble sds drill, access gear casing, remove cog set closest to trigger along with drill/anvil shaft. Separate cog shaft and rotary shaft. Check aluminum cam for stiffness or seizing. If damage is seen on aluminum cam, use fine grit sandpaper on ALUMINUM PART ONLY, to remove major scores and scarring. Apply gracious amounts of provided lubricant with tool or higher rated gear oil. Reassemble gear casing using only a few screws at first, test actuation, fully assemble entire drill. Test actuation at full speed under no load. Insert bit and test on hardened material (aka cured concrete). Life expectancy degrades rapidly with dry cams and extremely high use in short amounts of time.
A small part that helps the switching is probably broken.
Go to the dewalt site and the service online in order to find the faulty part. It would be cheap if you want to buy it. Your can repair it by yourself.
SOURCE: strange wurring sound and slight vibration at full
On most sds drills the movement of the beat piece inside the piston cause then to vibrate, even at slow speed, this is normal, the most speed the louder the noise and vibration., note: is not a grinding noise, it should be a smooth nocking constant sound, as so the vibration.
SOURCE: Dewalt dw511 hammer drill won't hammer, only
The hammer inside the drill head are most likely damaged ans/or broken, it is likely the best thing to do is just replace the tool.
SOURCE: how sds drill differ from ordinary rotatary drill .what are main basic feature of sds hammer drill
The difference is the working action. SDS drills use a corrugated cams running against each other.
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