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Clearly this is a design flaw with much too small a connector to handle the current this thing draws under load. I burned out two of them on one day while drilling about 12 lag bolt anchor holes in concerete with a 3/4" Bosch masonry bit. I own a lot of Bosch power tools but this one is a real clunker. Total time on each drill was probably under two hours. Powerful, but useless for more than a few minutes work at a time. After returning the first one and burning out the second, I disassembled it and the wire clip to the field coil was completely burned out.
Since the cost to repair it, while out of warranty, is darn close to the cost to buy a new one, I have decided not to repair it. I owned this drill for about 1.5 years. The reviewer below seems to me to be a hired marketer. In that time, I used it to drill somewhere less than 10 holes - all less than 1/2" in diameter into ordinary concrete. Since I started having problems, I have found a number of reviews and web pages of people complaining about the electrical problems of this drill. After the warranty expired (No Bosch standing behind it), the drill just quit going in forward - it will run all day in reverse, which isn't much use.
The drill went through like a knife through butter. Cons - Does not have the quick release chuck that my friend's Hilti has. I bought this drill at Lowes with a pricematch to Amazon.com's price because I couldn't wait to receive it through mail. You have to use a key to open and close the chuck on this drill. I used the drill to drill a 6" diameter circle of holes through brick and mortar so I could chisel out a hole in my wall to run a kitchen vent. The drill is good looking unlike some of those ugly looking Hitachi tools. This drill seemed to drill about as well as my friends Hilti which I used on my house before.Pros - Good performance for the price.
I bought a 5 pack set of the Bosch blue granite drill bits to go along with it. I had such a hard time trying to get this job done with a regular Craftman C3 cordless drill with cheap masonry bits. Not a big deal for me because I do not regularly use this tool but if I was doing this regularly I would have bought a drill which has "click" chuck which does not need a key. Comes with a box to keep the tool and masonry bits.
One of the first holes I drilled in concrete was drilled too deep as it went so fast. It is great to be able to actually wrap your hand around the key. The chuck key is huge. I am really pleased with this product. The depth guide vibrated out so I tossed it. The hammer drill comes with a nice case which has a place for a lot of drill bits. The side handle may be useful when drilling a lot of holes at one time but for me I do not bother.
This drill worked fine using Bosch Blue Granite carbide bits. Probably took me 10 minutes each hole because of all of the bit swapping. Then drilled it out to 3/4 inch in steps using 1/8 inch larger drill sizes. Caused by the hard aggregate in the slab concrete. Needed to make 3, 3/4 inch holes 4 inches deep in a concrete slab.
I mention the age because as concrete ages it continues to harden. I first drilled a 1/4 inch hole. The Bosch bits took it all in good shape. Sure a Hilti would have done a hole in 30 seconds and it should for what it costs. A 60 year old concrete slab.
That hole actually was the slowest hole to drill. Other choice was to rent a Hilti for about half of what the Bosch cost. For the last 3/4 inch hole I used a bit made NOT by Bosch and the carbide tip chipped badly on the second and third holes.
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