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I own a hammer drill (DeWalt d25263). I was using it today, and everything went well. But as I removed the SDS chisel bit that I was using, I saw a good bit of grease on the shank of the bit. I've never seen this before.

I'm worried that the tool has been compromised. The instructions say to take the drill to a repair shop to have it cleaned and lubricated after use. I would like to know how to lubricate it.

I looked for videos on YouTube but didn't find anything that was helpful. Can you please tell me how to lubricate a hammer drill?

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    Based on the model number your drill is not a hammer drill, but a rotary hammer drill. I own a rotary hammer drill of a different brand and it has an access hole where grease can be added. Since the DeWalt instructions don't mention adding grease yourself, my guess is that you probably have to remove part of the drill casing itself to access the lubrication ports, and I doubt that they want you to do that yourself, and depending on your skill level, it's probably not a good idea to do that. Just lubing around the chuck will not be enough and you at some point you will need to get lube added. – Itsme2003 Jan 17 at 6:48
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Here's the relevant bit, which includes some liability tone:

Your tool was properly lubricated before leaving the factory. In from two to six months, depending upon use, take or send your tool to an authorized service center for a complete cleaning, inspection and lubrication. Tools used constantly on production jobs will need relubrication more often. Also, tools “out of service” for long periods should be relubricated before being put back to work.

The simple fact is that it doesn't need periodic lubrication for the casual user. It would be different if you were a professional drilling dozens of holes every day.

If you like, dab a little common grease in the chuck on occasion. There's a lot of slop (movement) in that type of chuck, and friction can heat things up if it's totally dry.

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  • Cool, ok, will do. When you say "grease in the chuck," do you mean without unscrewing or taking something apart? Or could I just put grease on a bit and then insert it, to achieve the same goal? – Mark Jan 16 at 20:29
  • The chuck is what holds the bit. I'm not referring to the chuck mount or anything internal. You could grease the bit as well. Really it's not that important. I've used hammerdrills in construction settings for many years without every lubricating the chuck. There's usually enough dust in there to do the job for me. – isherwood Jan 16 at 20:31
  • The larger tools jack hammers and rotary hammers recommend that you put high performance grease on the bits before being inserted. Though I don't follow that advice very often. – Fresh Codemonger Jan 17 at 0:19
  • @isherwood Do you have any guesses as to why grease leaked out while I was using it? I've used it lots of times, but this is the first time that happened. I had used it for about an hour chiseling up tiles today, and that's when I noticed it (as I was putting it away). Thanks! – Mark Jan 17 at 0:32
  • Grease can't really "leak". It's not liquid and generally only moves by being pushed around. It probably just worked its way out due to prolonged use and heat buildup. If you still think there's something wrong, have the retailer look at it. – isherwood Jan 17 at 13:59

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