Archived from the Tools In Action forum (Dewalt). This thread is read-only.
i just bought a dewalt dcf899 impact wrench. its a nice tool, but why no grease in it??
i literally used it one time to change my mower blades, and then it started making an aweful noise and chatter when free spinning with no load. i noticed right at the anvil shaft that there was some black fine powder. so i decided to take it apart and low and behold, hardly any grease inside. and absolutely no grease at all on the anvil shaft or the bushing in the case.
it seems to be a common theme with dewalts to be under greased, but this is ridiculous. and i’d hate to think how many other of these impacts have no grease.
by the way, the impact works real smooth now, after i added grease. i’m just not happy about the premature wear from running with no grease.
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I don’t think there needs to be that much grease in there, I have rebuilt pneumatic impacts and there wasn’t a huge amount of grease. I think all it needs is a coating it’s not like a gear case, but again pneumatics you should continually add oil to the tool for proper operation
How do you like the gun though? I really want on of these but don’t need one at the moment.
Was it as powerful as you expected?
That is pretty bad. There should have been enough grease in there to prevent the chatter and wear you described.
Sounds like the robot grease machine ran out as it was filling yours up!
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Now that’s it open Id put a good quality grease in there.
I keep a tube of Loctite Viper Lube on hand for stuff like this, plus I use it to grease all my SDS bit shanks. It makes for some dirty shanks, but they work much better when the bits can actually slide in the chuck 😉
Sucks that they couldn’t put any grease in it glad it is working ok now
That blows, you should not have to open a new tool to add grease… That tool should last a good long time before any pm is needed like that….
I wonder if you would void the warranty by opening it up?
There should have been more than that, but there isn’t a lot of grease in them to start with.
Conductor562 wrote:
There should have been more than that, but there isn’t a lot of grease in them to start with.
i can understand not to have a lot of grease, but to have absolutely none on the anvil?? even just a dab with a finger would have been way better than nothing.
when the impact was making the chattering noise, it would go away when i pressed in on the anvil tip while running, plus seeing the wear dust, so thats when i figured i better open it up to see whats going on.
its just kind of a shame, that with as nicely designed this impact is, that it makes it out the factory(blame china, lol) without the simplest of things(grease).
Wow man that sucks to hear I’m glad that it’s working smoother now but like mikey said u shouldn’t have to be opening up no new tool.
Mass production will always have a few rejects. Luckily you knew what to look/listen for.
Awhile ago, when I got my M18 fuel impact, I had to exchange the first 2. The forward/reverse switch on the first one wouldn’t lock and just slid back and forth. The second one made the loudest screech and clacking sound when you took your finger off the trigger!
The third one was good!
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They must be trying to save grease in China these days.
Just purchased this beast anyone else having this problem?
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TheDon81 wrote:
Just purchased this beast anyone else having this problem?
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open it up and see how much grease is in there. its very easy to open, just remove 4 screws.
I was planning on it unless I could get some confirmation that this potentially was resolved, I should get it in the mail today.
Put some moly lube or something like that in there and put it back to work.
Yea I opened her up, she looked better than Framer’s but I still put a nice coating on the anvil and mechanism, will test it later on this evening.
I’m struggling to find out what the correct grease is for these, every person I ask says just put this in or just put that in. Anyone here actually fully know the correct grease ?
I don’t fully know but if you look at a parts list for the dcf899 the only grease that is listed is G-2008 Molykote. I think this is the same lube they use in the gear cases of a lot of tools but that must be all they’re using as they don’t have anything else listed. I’m no grease expert but I would say the exact grease probably isn’t real critical. A couple things to keep in mind though, too much gerase will actually make the impact not hit as hard and there aren’t any seals in the nose cone so if it’s too light of a grease when it heats up it might get messy leaking grease.
Robrob wrote:
On 9/1/2019 at 6:15 AM, Robrob said:I’m struggling to find out what the correct grease is for these, every person I ask says just put this in or just put that in. Anyone here actually fully know the correct grease ?
any grease is better than no grease, but i think any grease that contains moly will be good.
Weird …I’ve had mine since it came out and use it daily,a lot…don’t know about the grease