Anyone know how to remove the brush holder ring on a bosch 11255 bulldog extreme. the ring does not rotate. so i need to get the ring to rotate and remove the brushes.

It sounds like the issue with your Bosch bulldog extreme max hammer is likely due to worn out or damaged brushes. Here are the steps to remove and replace the brushes:

1. Unplug the hammer drill from the power source.
2. Remove the two screws on the top of the hammer drill handle with a screwdriver.
3. Lift off the top of the handle to expose the motor.
4. Locate the brush holders on either side of the motor.
5. Gently pull out the brush holder on one side of the motor.
6. Remove the brush from the holder by gently pulling it straight out.
7. Repeat for the other side of the motor.
8. Inspect the brushes for damage, wear, or discoloration. Blackening of the brushes is normal, but if they are excessively worn or damaged, they should be replaced.
9. Insert the new brushes into the brush holders, making sure they are properly seated.
10. Replace the brush holder on one side of the motor, then the other.
11. Reattach the top of the handle and replace the screws.

Regarding the digs in the motor surface, if they are not too deep and do not appear to affect the operation of the motor, they may not need to be addressed. However, if they are deep or if they appear to be affecting the motor's performance, it may be necessary to replace the motor.
It's important to note that working on power tools can be dangerous and should only be attempted by those with the necessary knowledge and experience. If you're unsure about any step in the process, it's best to seek the help of a professional.

• If look at brushholder unmount it and make clean look if the brushes are go good to each other most causes on this BOSCH tools is that the brushes 70% are hanging on dirth in the brush holder (brushplate) 16 first problem second true problem are the 2 suppression coils (adapter module 817 ) on the electric field. and also parts pos 19 left right switch contacts for the brushes can sometimes on ofthem be broken.

http://www.powertools-aftersalesservice.com/public/bosch-pt/service?p_auth=3aqey22L&p_p_auth=svtCUe1o&p_p_id=WSRP_bc93764e__6873__4b00__9a29__b331c9759da9&p_p_lifecycle=1&p_p_state=normal&p_p_mode=view&_WSRP_bc93764e__6873__4b00__9a29__b331c9759da9_wsrp-navigationalState=L0JPUy9QVEFTLVBULVNJUy1TaXRlL2VuX1VTLy0vVVNEL1ZpZXdQcm9kdWN0LURpc3BhdGNoO3BnaWQ9YmNkZTdkNTFiZjM0NGE0YTU1ZjYzYTYyOGY0MkRvVWFTdFRIO3NpZD1QYnVpWlFuNGVZcGtyVjZMemRLLW5nWnpLM0FSaDhEanA3b2h6b3RZdmhBZ3hZcFR2eHM9

You should be able to get the brushes out without removing the ring. Just pull the brush wire off the ring tab, hold the spring up out of the way and remove the brush. When new they should be about 1/2 inch long. If they're shorter than 1/4 inch or are too short for the spring to push them firmly down on the armature, replace them. The brush holder just slips over the end of the armature and up against the motor housing. To remove it rock it back and forth while pulling it out and it will come off. Another thing to check if you drill stopped all together is the power cord and switch. Use a volt meter to check that power is getting to and through the switch.

there is a selector knob on the side that controls the tool functions for drill only/hammer with drill/ and hammer only. make sure it is in the proper setting. If it still doesn't rotate then you have a gear or a broken selector. If no hammer then you have worn o rings or a stuck ram. try the selector first and if still no change please be more specific if no hammer at all, or no rotation even when selector moved.

Try at eReplacementParts.com : Power Tool Parts and Tool Repair Diagrams or ToolPartsDirect.com - Your Tool Repair Supply Store.

If you need more help come back.Post / thumbs / testimonial are welcome!

Unscrew the caps, carefully remove the old brush, replace it with a new one that is exactly like the old. Replace the screw cap. Thats it.

Pry the rubber tip off the bit holder with a small screw driver, then begin removing the snap rings untill all the parts are off the bit holder,(you will see how they come apart so I'm not going to explain it) With a magnet remove the (4) pins that hold the bit holder in, remove the bit holder. The shaft seal is probably leaking so you have to remove the whole gear housing. Turn the selector knob on the side of the drill to about 7-8 o'clock, push the red button in and pry it off. Remove the 4 bolts holding the housing on and remove the housing. You must remove the seal from the inside, you can't remove it from the outside. The rest is pretty straight forward. There is a retainer holding the bearing in the housing, you will have to clean the grease out to see it .Pull the bearing, push the seal out. Reverse the operation to assemble the hammer.

I know lots of stuff to do, if this is too much you may want to take it to a Bosch service center, it shouldn't take more that 30 min.

http://www.ereplacementparts.com/bosch-parts-c-128.html

bosch brushes are unique. they have a spring embedded in the carbon so when the length gets too short, the spring lets go and raises the brush above the commutator and the appliance stops. you need to remove the handle partially or the brush covers and unscrew the brush holder(s) two small screws secure the brushes and holder to the appliance.

Were the brushes severely worn? It's really only the brush that you need to replace, as long as the spring didn't come into contact with the rotor and get worn.