Rotary hammer won't rotate, hammers very good

With hammer drills, there are usually 3 positions for operation.

Position 1 - Drill only - drill rotates

Position 2 - Hammer and Drill - Drill rotates and hammers

Position 3 - Hammer only - hammer action

It is important to read the instructions to activate the part to select position 1, 2 or 3.

Sometimes, it is easy to move from position 1 to position 2. Sometimes it is easy to move from position 2 to position 3.
Sometimes it is difficult to move from position 2 to position 3.

When it is difficult to move from position 2 to position 3, you may need to rotate the chuck a little way before turning it to position 3.

Before the invention of the hammer drill, people face a lot of trouble drilling in the tight spaces. They had to break down the parts in smaller units in order to drill it properly. But, now the time has changed and the users can easily drill on a portable manner. But, one might wonder, what makes the best hammer drill
? The answer is being more and more complicated each year with so many brands on the market.

The market offering is huge and most of the brands are continuously reinventing their products. We have analyzed many different drills from cordless hammer drill to a corded hammer drill, to hammer drill machine to cordless hammer drill drivers. Thus, we have come up with these top picks.

then the broken hammerpiston or the impact bolt ring in front of the locking sleeve can be broken

Need more information - make / model
It sounds like you probably need a service kit - the orings are worn and it has lost compression. If you provide the make / model I may be able to direct you a little better.

could be a bent bit... if its not its gotta be your chuck or the screw that holds it on

SAME ISSUE *****SOLVED*****

You were on the right track but needed to go farther with top description without disassembly!!

I have a barely used Hammer drill also that will rotate and run motor but does not hammer in any position.

Grease is the issue.....

Heat and sitting causes the grease to weep out & even a small amount of dust binds up the hammer drill.

******SOLUTION*****

GREASE, GREASE & MORE GREASE....

REMOVE BIT....SQUIRT IN ALOT OF THE BOSCH GREASE HOLD LOCKING CHUCK OPEN. INSERT A SPLINED BIT INTO THE HOLE AND PLUNGE GREASE IN SLOWLY SEVERAL TIMES. REMOVE BIT & REFILL GREASE & REPEAT.....VOILA.....HAMMER WORKING AGAIN....

BE SURE TO USE LOTS OF GREASE & DUST COVERS ON Bosch HD WHEN WORKING. WE ALL ERROR AND FAIL TO MAINTAIN FROM TIME TO TIME!

Look for a lever that has signs hammer/drill or just drill Place the lever in the hammer position.

The hammer inside the drill head are most likely damaged ans/or broken, it is likely the best thing to do is just replace the tool.

The SDS designation relates more to the type of chuck on the tool for the bits than to the tool/drill itself. There are both chisels and drill bits with SDS-Plus and SDS-Max shanks, SDS-Max being the the larger of the two. As far as the tools go: Demolition hammers will only hammer and can only use pointed chisels, scaling chisels, scrapers, etc, not anything like a drill bit that requires spinning to work. Rotary hammers can hammer and rotate the bits. Rotary hammers have a selector switch with two or three positions; one for hammer only for the above demolition bits, one for rotary hammer for use with carbite tipped drill bits, and some have a position for rotation only. The rotary hammer is a more versitile tool but more expensive because of extra workings inside.

most of these types of tools have a manual switch it will be located on the body of the drill just behind the chuck on top or bottom or oposit the grip handle. some models have 2 switches.you want to make sure the switch points to the picture that shows a hammer and drill together.also rember it needs to have down pressure for the hammer part to activate.