Bosch 11304 Braker repair

[dieselMEN]

I have a bosch 11304 Hammer. it seems to have lost its punch the motor and piston rod seen to work fine. I looked at the striker and piston there is no visible damage. although there is Grease every where. what give the striker power? is the grease supposed to be behind the striker in the cylinder? is the grease causing a suction, not allowing the striker to move freely?

thanks for any info
Mark

[Tinkerdave]

Mark, The piston causes high pressure in the cylinder forcing a slug down the cylinder which hit the striker pin which hits the bit.The striker pin has two o-rings and moves back and forth in short strokes.This most likely where your problem lies.You have grease leaking from the transfer case and this is why it coming out the bottom.Install a service kit and replace the grease but don't replace the striker o-rings unless their damaged as replacement o-rings will have to go through a break in run of a couple of hours to get the hammer action working good. Hope this helps.

[dieselMEN]

Thanks for your response, I have ordered the service kit and I am uncertain to where to put the grease. I currently have grease in the motor housing, (connecting rod area) the hammer piston (inside and out) and the Guide tube. I will clean the old grease out as best as possible.
What is the procedure for replacing the new grease?
Do I just squeeze the content of the tube in the motor housing (connecting rod area) and reassemble?

Is the o-ring you say not to replace #32 of the internal flange?
Bosch 11304 Parts List and Diagram - (0611304034) : eReplacementParts.com

Any help will is appreciated
Thanks
Mark

[Tinkerdave]

Hi Mark.No you don't want to replace # 1610210033 ref #27. and yes you put the grease in the crankcase where the connecting rod is.the kit I believe gives you instructions on most of that. Hope that helps.