How to remove selector knob from bosch hammer drill gbh 2-20 s

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There are different knobs the old models have a knob they must jumped out but there are rotary hammers and drill hammers they have a red button in the knob that must push in and rotate clockwise setting to the end of it rotate hammer or 1 further only hammering and then push the red button more then normal with something and turn a little more further until its end and pull on the knob and feel it comes free.

Its usually a problem with the selector knob... depress the button fully and turn it passed the selection markings and pull it out to remove it

If both functions, hammering & drilling, work correctly on their own but not together your selector knob may be the issue. On the back of the knob is a driver pin that moves the necessary parts to make your tool drill, hammer, or both. If it isn't moving those parts to the exact right place, one or more of the functions may not work. Try moving the selector halfway between positions and see if the gun hammer-drills. If it does you have problems with the selector or drive pin. If it still does not you may have internal parts problems that can only be diagnosed by working on the tool with the knowledge of how it works and how everything inside should be.

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.

Check that the ramped discs and the selector lever for the hammer action are assembled correctly. The lever should push the chuck shaft clear of the hammer action discs or release the shaft so that it can move inwards to allow the ramps to ride up each other.

a bad trigger switch; bosch sells a replacement part

hi

check the cord and the switch to have continuity,the wires,the brushes,the rotor and stator.

regards savumihai71

By rotary switch I guess you mean the selector? If so it is rather easy in a way on the schematic you have you will seel that it has a pointer that the button of the switch has to face, but the key to this is that you need a small screwdriver or other object that you need to push the red button in and turn the selector past the stop and then it will pull out . Let me know if there is something I am missing and good luck. If I have answered your question would you please rate my solution accordingly.

Go to Boschtools.com and type in your number or go to tools and rotary hammers and highlight your hammer, it will take you to another page and then you can look at a breakdown which is very specific on the direction and placement of the selector. The shift fork must be in the forward position and you can eyeball it with the post on the selector after you have it in position to lock it in. Remember you have to depress the plunger on the selector to reinstall it. Let me know if you still are having problems.