I’ve got a 7/8″ Bosch Bulldog with a chipping function. Just used that feature for the first time today, and oil seems to be leaking from the chuck and running down the bit. Never happened when I was making round holes. Is this normal? Do I need to re-lube it somehow? How? Or is this a Very Bad Sign?
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Replies
Sounds like your bulldog is more into chipping that he is into drilling holes. ;-)
Was it running hot? There's usually a lot of grease in a hammerdrill chuck which does sometimes melt out when it's running too hot. I've got a larger Bosch hammerdrill and it came with a tube of grease. Still got your owner's manual? That'd be the right place to start. If you don't, I'd bet it's online on the Bosch website.
I'll second what dieselpig said. I've got the same roto-hammer. I used it for about 30 minutes today and it go pretty hot. However, I didn't have any grease running out today. The bit was clean when I stuck it in the tool.
The bit should have been greased when you put it in. At least thats what my owners manual says. I think they tell ya to lube everytime you put a bit in.
BTW The grease always gets hot and runs down the bit on mine.
That's common and to be expected. I suppose there's no harm in adding more lube, but many guys I know assume the whole critter will be worn out by the time lube in the chuck makes any difference. The owner's manual should say something if more grease is recommended. If you're concerned lube it anyway.
Best of luck.
Beer was created so carpenters wouldn't rule the world.
thanks. it was pretty hot, but it's still chugging away, so i'll leave it for now. instructions indicate to lube when replacing the brushes.
thanks all!Amateurs talk strategy, Generals talk logistics.
I was secretly hoping you would post what the instructions suggest. At the rate the brushes are wearing the whole works will be pretty worn out.
Beer was created so carpenters wouldn't rule the world.
http://66.77.255.87/Images/BOSCHPDF/11224VSRC_pdf/PDF_MANUAL/11224VSRC.pdf
Page 7
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Remember to grease the bit a bit. Hilti sells a nice little can of bit grease. Rub a bit on the SDS portions and you can have hot grease mixing with rock dust. Our new Hilti came with a Hilti towel to use with the grease.
The ToolBear
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