Re: Bosch 11247 Hammer drill works in drill mode but in...
Usually replacing the o-rings on the piston, striker and Impact bolt will solve any hammering issues. That is considering there is no damage to the mechanical parts in the hammer mechanism.
Usually replacing the o-rings on the piston, striker and Impact bolt will solve any hammering issues. That is considering there is no damage to the mechanical parts in the hammer mechanism. Usually replacing the o-rings on the piston, striker and Impact bolt will solve any hammering issues. That is considering there is no damage to the mechanical parts in the hammer mechanism.
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Top up the transmission with PAG150 oil. The Bosch stuff is hideously expensive, but it's the same as the 150-grade oil used in car a/c systems. I fill them so the oil *just* covers the big gear.
You were on the right track but needed to go farther with top description without disassembly!!
I have a barely used Hammer drill also that will rotate and run motor but does not hammer in any position.
Grease is the issue.....
Heat and sitting causes the grease to weep out & even a small amount of dust binds up the hammer drill.
******SOLUTION*****
GREASE, GREASE & MORE GREASE....
REMOVE BIT....SQUIRT IN ALOT OF THE BOSCH GREASE HOLD LOCKING CHUCK OPEN. INSERT A SPLINED BIT INTO THE HOLE AND PLUNGE GREASE IN SLOWLY SEVERAL TIMES. REMOVE BIT & REFILL GREASE & REPEAT.....VOILA.....HAMMER WORKING AGAIN....
BE SURE TO USE LOTS OF GREASE & DUST COVERS ON Bosch HD WHEN WORKING. WE ALL ERROR AND FAIL TO MAINTAIN FROM TIME TO TIME!
you need to get that chisel out. If it was hammering with it before the end of the chisel might have broken and not coming into contact with the striker, if it did not then the end of the chisel might be damaged not allowing it to seat fully, either way get the chisel out and put in a regular bit and it will probably work.
have you tried turning the speed dial up and down a few times, sometimes that works. I am not aware of any to bypass the electronic circuits in this tool.
There is a clutch in the main spur wheel of the unit. These sometime begin to slip, on rare occasions they will slip to the point where the drill will not rotate. If you are interested the part number for this clutch is 1617000817.
Check to make sure part number 30 is not stripped out or the edge knocked off. I can't find a part number on Ereplacement for them but I am sure that Bosch would have it. It sounds like you are on the right track and the way you describe it the gear is bad and like I said I think the keys might be bad also
Inside there is a little plastic shaft, where the selector hooks to. They have had problems over the years stripping. Replacement part is still plastic. Yay! You may need a bearing puller or find some way to get the clutch off the shaft. Lemme know. Please rate me
i really dont worry about the leak near the shaft because with out the oil in the shaft there is a possibility that the shaft can jam. even dewalt new hammer when you purchase it come with the grease/lube like a toothpaste size. this is to lube the bits for the purpose the bit/shaft can move freely & also can hammer freely. our you can do is to dis-assemble the front end sleeve & remove the excess oil.will i agree weather can also change the viscosity of the oil. varsol cleaner can do the trick available at walmart.
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