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Re: 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.
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Not all bits for hammer drills are the same as the slots in the sides of the shanks are different between makes . There is a standard between hilti and ramset drill bits but other makers have different ideas Check out the shanks of your drill bits and look for the slot that holds in the bit.
Push the rubber sleve off the drill bit and up the drill bit then the plastic ring. release the clip around the spindle. Slide the clip and chuck sleve forward and remove the ball sitting in the spindle. You should then be able to pull the bit from the machine. If it does not want to come hold the bit in a vice and tap the spindle off the end of the bit using a suitable punch. Rebuild chuck in reverse.
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.
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
if it slips to easily that is a problem, but it is designed to slip some when the bit binds up in the concrete. If you feel it is too easy, I would not recommend trying to service at home. I used to work on them and they are a pain, the clutch is an assembly and I would recommend taking to an authorized service station so they can check the static slip on the clutch mechanism and then advise whether needs serviced or acceptable.