Bosch 11304 Jack Hammer

[klhwarf]

Was using the brute electric jack hammer and it quit impacting at the bit. Have owned since new and has <100 hours on it. Last thing I did was lift it up and placed it horizontally on a wheelbarrow for 30 minutes or so. Also remember touching the trigger and the jack hammer running unloaded for a second in this position.

Any idea what I may have done to it?

[cmoorejack]

Hey klhwarf.
Its probably not anything you have done..it may have developed a dry pocket where the striker moves[or doesn't move] Time for a service pack or at lease a re-lube of the striker and chamber..the service pack contains everything you will need to service your tool..just match up your model #...either a 11304 039 or a 11304 139..
parts avail at eReplacementParts.com : Power Tool Parts and Tool Repair
hope this helps..
cmoorejack

[ronnie callahan]

is there a tool (hone) to use on the piston tube when the bore is out of round!

[Dale]

Don't use a hone on this tool. Clean the piston and stiker really good. Put a fine film of bosch grease on both. go to youtube and type in ereplacementparts and there is a short video.