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Hy i have a hitachi wh18dl impact drill, when i pull the trigger it makes a very quiet buzing sound but does not spin, it simply stooped, i have changed the the battery, put it in reverse worked for 5 sec and since then it started to make that buzing sound
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First The model is pretty new. you need to register your tool on line. this takes you from a one year warranty to a three year warranty. They will give you a pro-vantage number. with that said it sounds like a trigger switch. Yhe trigger switch is the brain of your tool. not only does it do your variable speed but it also controlls the brake and your fuel gauge. Because of the cost I highly recomend taking it to your closes Bosch service center.
When that happened to one of my drills, it turned out that the connection up inside the handle where the battery connects to the drill needed to be cleaned. I also had to use a screw driver to slightly bend the connectors inward (away from the side) on the inside so the battery would make a better connection. If that doesn't solve the problem, they there is most likely a loose connection in the switch or wires leading to the motor. I have never had the brushes go out on a battery operated drill so I would start with checking the battery connection first..
Make sure it's all the way in gear. It sounds like it's not all the way in first or second gear. Yes it sounds dumb, but it's one of the most common problems we see in our shop.
Replacing the chuck on a drill is simple when you know the trick. I worked at a tool rental center while attending college and learned how to repair many tools. Open the chuck enough to remove the screw that you will see inside the chuck. It will most likely be reverse thread. The chuck is threaded on the shaft so just simply close the chuck on an allen socket and impact off with air or electric impact tool. If you do not have an impact tool close the chuck on-to the largest allen wrench that will fit into the chuck.(with the long part of the allen wrench projecting out) You will need to set the drill into a vise or strap to work-bench, then strike allen with hammer. Most chucks are removed with one quick impact of the hammer, counter clockwise. Do not squeese the drill too tightly with vise, we used a piece of leather to protect the drill. Good luck. Enjoy
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