SOURCE: hammer drills and rotary hammers comparison
Basically yes. Lower power units are usually titled as "hammer drills." Higher power units, usually labeled "rotary hammers," tend to be larger and provide bigger impact forces. But there are a few differences that are worth knowing: The rotary hammer usually have a chisel only feature, for light chiseling and masonry removal. Rotary hammers also have specially designed chucks that only accept bits specifically designed to fit their chuck. The special chuck on a rotary hammer helps hold the drill bit and prevents it from slipping during use.
SOURCE: DeWalt 567 rotary hammer won't hammer
If still under warrenty local Dewalt store will repair. Total rebuild $99.00 on most tools.
SOURCE: Dewalt dw511 hammer drill won't hammer, only
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.
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