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Can a bad trigger cause my Bosch brute jackhammer not to run correctly

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  • Bosch Master
  • 1,805 Answers

First to look for faultering contacts on electric field and carbon brushes sometimes a suppression capacitor can give some problems a worn commutator on the armature a switch can be overhauled with a direct cable contact to test to know if it is the switch test it out only with 2 persons for safety in that case.

Posted on May 06, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 18 volt "brute tough" Bosch

You need to replace the trigger unit to correcxt the problem.

Posted on May 23, 2008

stug_57u
  • 99 Answers

SOURCE: Bosch Brute Breaker

What age is the machine? If it is fairly new it might just need to be run a while for the grease to loosen up. If it is older you will need to make sure it has enough grease. These tools don't need a great deal of grease, but too little will soon be thrown about and disperse too much. Another problem with these is if the inner cylinder, that moves up and down to create the pressure for teh striker, has a hairline crack, it can be quite hard to see when the part is dirty. When running though air will leak out and you will loose hammer action but still have plenty of vibratiion. Another thing to check is to take the piston/cylinder and striker out and hold it facing down. The striker should slide out slow and steady. If it falls out too fast then the cylinder and/or striker is worn. You may be able to rectify this by applying a bit more grease. If it doeesn't fall out at all then there is a build of grease behind the striker causing a vacum holding it all together. You can solve this by pushing the striker in a little way, and leaving it standing for an hour or so with cleaning solvent on top. It should work it's way in and help release it. It may still need to be 'persuaded' out a bit aswell.

Posted on Oct 25, 2008

brewerstool
  • 141 Answers

SOURCE: I have a Bosch brute jackhammer, I need the tool

You can use an adjustable face spanner wrench to remove that cap. I don't remember the pin size but you can measure the holes and get the appropriate size. You can remove the whole plate with the armature by undoing the 4 cap screws. Prior to removing the motor plate you have to remove the handle plate from the axle that goes through the body. Undo the nut that holds the assembly on and slide it off. You can now remove the Armature plate. After removing the cap screws pull the assembly out about 1-2 inches. You will see the wires that go to the field attached to the brush holders. Remove the screw that holds these wires to the brush holders. You can then safely remove the whole assembly. This also makes it easier to remove that cap plug with the spanner wrench, because you can now put the whole assembly in a vise. I always heat around the cap with a torch before doing anything. Then I tap on the plug with a hammer a couple of times and voila it turns alot easier. Corrosion almost always builds up on this cap because of the different metals. (Steel and Aluminum respectfully)

Your hammer may have a broken connecting rod. To inspect this make sure you ping the cylider and body with marks so you line them up the same way. Then remove the 4 cap bolts that hold the cylinder to the body. Remove the cylinder and inspect the hammer cylinder and rod. If the connecting rod is not broken you will have to inspect the gears and pinions to make sure they are ok.

Posted on Sep 13, 2009

rowdy45176
  • 2176 Answers

SOURCE: have a problem with bosch brute jackhammer, quit

did you check the cord first? after that I would check the brushes and make sure the switch wired correctly. Let me know if you need more assistance.

Posted on Dec 17, 2009

rowdy45176
  • 2176 Answers

SOURCE: need a manual for a Bosch 11304K Brute Breaker

go to Boschtool.com and on the lower left hand side you will see a box, put your model number in there and you can download one. If you still have trouble let me know and I will try another route.

Posted on Mar 27, 2010

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1 Answer

Why my Bosch brute jackhammer only hums when I press trigger? Can someone help me please?


seems as if the jackhammer motor is locked up and frozen might wanna be careful opening it up and freeing that motor up while its unplugged

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Beware Time for service something does blocking the armature if that happens a bearing or other broken part.

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measure powercable control carbon brushes that autostop in front of the carbonbrush was coming out of the brush if thats not control the electric field to brushholders and switch.

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The armature AND electric field must together replaced to get a safe working again, and the defect will not repeat if it be shure have its operating hours on it and give a full service.

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My jackhammer will not run, the cord and switch are good


Check your brushes. The brushes on the Brute breaker have a spring loaded, non-conductive pin in them. When either brush wears down far enough the pin pops out and prevents damage to the expensive armature. If by chance the brushes are OK you may have to have your armature tested.

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1 Answer

Have a problem with bosch brute jackhammer, quit working while using it, replaced switch, still nothing, anyone that can help?


did you check the cord first? after that I would check the brushes and make sure the switch wired correctly. Let me know if you need more assistance.

Dec 15, 2009 | Bosch Hammering

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