My rh540m rotary hammer drill has power to the armature but armature will not work.the brushes are brand new

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: Ryobi cordless drill burning smell

your over using the drill on havy jobs

SOURCE: i have a bosch rotary hammer 11245evs and it was

They are filled with a special grease that comes from Bosch. It sounds like the impact bolt or the striker pin in the unit are not moving the way they should. These are the pieces that work together to create the hitting action. About all that can be done now is the unit has to be dismantled to get those to pieces moving again. Bosch makes what they call service packs for all thier hammers. They have all the o-rings and grease to get your hammer working again. A Bosch service center can supply you with the kit. Ask for P/N 1617000225, or they can take care of it for you.
Hope this helps

SOURCE: I have a makita hr2455x rotary hammer drill that won't hammer

you need to get that service,
the grease causes the hammering.
and probably too much pressure was applied
to it.

SOURCE: dewalt cordless drill dc988- drill motor works

Test the brushes by catching it in a stalled condition when you have it triggered, then rotate it slightly. If it takes off suspect the brushes or a dead segment on the comutator.

If it doesn't respond to this, then consider the VSR trigger... open it and test by bypassing it when in stalled condition...