No hammer effect, motor work OK

That particular battery is defective and falsely indicating it is charged.

It is very likely the carbon brushes that contact the motor to transfer electricity to the windings. those tend to crack and get stuck or wear out. They need to be moving in and out freely and have spring pressure pushing them in towards the motor. you can get new ones cheap at ereplacementparts.com if they sell them.

DeWalt says:
Number of drilling modes
3 modes. Rotation only, hammering with rotation, or hammering only with rotation stop for light chiselling applications in tiles and plaster and impact stop mode for rotary drilling only in wood and steel.
Maybe yours is doing the second one?

sometimes the motor of it have something called CARBON BRUSH inside,, try to look at it and replays a new one,,,,it is the most common trouble of a drill when its getting old olready but still can be fix by your self..good luck its not to hard..

you have me stumped on this one. The tool you have is a spline shank hammer and it should accept all standard spline bits and also hammer iron that is made for these. Is it possible that the Bosch bit has a burr on the splines not allowing it to lock? I have checked the Hitachi site and found no reason it would not work. I will continue checking though.

The selector switch (hammer drill/drill) has to be fully set to the hammer drill position for it to work. Also, the bit has to meet some resistance for the hammer effect to be more pronounced. Make sure also that your forward/reverse switch is set to forward.
Best regards, --W/D--

I would think the brushes or motor is bad, or possibly a loose connection

I hope this drill is still under warranty as the battery is in serious trouble. As long as the motor is turning, it should not be causing the battery to do this. Hope this helps!

hi , the bad news is you have almost certainley damged the motor and may have damaged the switch ( it is also the speed controller ) , the good news is because its a Makita then you will have little trouble in getting spares for it , if you repost the actual model and what country your in and ask for a spares diagram/parts list i will help further

sds plus to max adaptor....