My milwaukee drill spins on inside but nothing on the outside it doesn't turn either way!

SOURCE: Spline drill bit won't spin

There a a few things to look for, first is the selector on top in the hammer only position or hammer with rotation. Second look at the spline bit, does the splines look worn excessively also try and look in the nose of the tool for spline condition and last the clutch mechanism might have come apart. Good news though this tool might be covered under warranty, some had a 5 year coverage.

SOURCE: stopped working in mid drill. squeeze the trigger, nothing happens

It could be a dirty switch connection in the trigger assembly , it happens to me on my electric sanders all the time , just open it up and try blowing it out with an air compressor

SOURCE: my milwaukee 5316 rotary hammer drill wont

Could be a couple things, do you have the selector in the rotation mode, also there is an internal clutch that might have broken or the splines on the spindle might be rounded. If it is the clutch you would have to take it in for repair, it is extremely tricky to work on. Take the bit out (make sure you are using the right bits for this tool) and look at the splines to check their condition. Let me know if I can help more

SOURCE: Milwaukee 1/2 lithium ion 18v drill not working

I have the same problem and its about a year old too.

SOURCE: Hi I have a milwaukee

the new chucks are not what they should be try some penatrating oil when they get slightly rusted they tend to do what your chuck has done you will half too get 2 pipe wrenches to break it free chuck them on as you would grip them with your hands once it is free work the chuck back and forth with the penatrating oil to loosen things back to new