All Replies on DeWalt Compound Miter Saw Screech at Start-Up

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DeWalt Compound Miter Saw Screech at Start-Up

by Steve
posted 02-16-2018 04:25 PM

7 replies so far

View Ripper70's profile


1378 posts in 1755 days

#1 posted 02-16-2018 05:52 PM

I think you may need to start an exploratory disassembly of the saw and start checking things like the armature bearing or the belt pulley and the gear that engages the arbor, etc. While you’re at it, blow the dust out and lubricate anything that moves. I’m skeptical of bearings made to “last the life of the saw”. Who’s to say whether DeWalt believes that life isn’t any more than 3 years?

If replacement parts are necessary, it’ll cost you the small price for the parts and whatever your time is worth. Bringing to a service center for out of warrantee repairs will probably cost half as much, if not more, of the price of a new saw.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

View John Smith's profile

John Smith

2651 posts in 1009 days

#2 posted 02-16-2018 06:21 PM

remove the blade – clean the bolt and female threads and all the washers
with a solvent and brass brush – get everything squeaky clean.
reassemble and see if that works. (I used turpentine and then the aerosol Brake Cleaner).

-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --

View Steve's profile


82 posts in 1857 days

#3 posted 02-17-2018 05:31 PM

Thanks for the tips. I’ll start pulling the saw apart on Monday and see what I see. I believe the saw is just barely within the 3-year (limited) warranty period, but although I’m normally pretty good saving receipts, naturally, this one has vanished. (I bought the saw in the middle of a move. That’s my excuse and I’m sticking with it.)

I’ve replaced bearings on both an old Grizzly table saw and my long-in-the-tooth Ridgid sander, and my experience has been that the results are better, but not quite up to factory original. Those tools were near the end of their life, though; hoping for better results here. Stay tuned.


-- ~Steve

View 000's profile


2859 posts in 1746 days

#4 posted 02-17-2018 05:37 PM

1st thing I would try is to take off the belt and see if it still makes noise. If it still does, that at least eliminates the arbor bearing.

View runswithscissors's profile


3110 posts in 2872 days

#5 posted 02-18-2018 12:30 AM

I bought a 12” Bosch Glide miter saw 2 years ago off CL. It had one troublesome issue, and that was a ticking sound it made, like maybe there was a cracked cog on a gear, or something. So I stripped it down to get at the bearings, gears, and belts, but found nothing that I could identify. So I put it back together, and the noise was gone. Guess that makes me some sort of genius (though not necessarily a stable one).

Sometimes machinery does heal itself.

By the way, I have found the saw to be very accurate and stable. I like it.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View Steve's profile


82 posts in 1857 days

#6 posted 02-19-2018 07:29 PM

To avoid suspense, I got this resolved and it is a failing/slipping belt

Here’s the journey:
I removed the blade. Seemed like the bolt was looser than I’d like and there was more grease around the arbor than I would expect:

There were four screws holding the gear housing in place. Inside, it was pretty well lubed, though a lot of the grease had just been thrown into nooks and crannies where it was doing no good. I smeared it around a bit and removed a little of the excess.

The gears were in good shape. I couldn’t detect any roughness or looseness in the bearings. Sorry, the photo is a little blurry.

I did run the saw without the belt and couldn’t hear the screech. It occured to me, though, that a bad bearing in the motor might not make noise if there was no load.

I reassembled the saw and set the belt tension to the specifications outlined in the manual, which say that when pinched in the middle, the belt should almost touch. The factory setting was much tauter than that, but when I ran it sans blade, the noise was gone. I did note on reinstallation that the belt was a little frayed:

Once I put the blade (newly cleaned!) back on, the screech came back. I had the belt cover still off and could see the belt was jumping around at start up. I tightened it up further and the noise, even under the load of the blade, disappeared. The manual warns that an overly tight belt could lead to premature motor failure, so I’m going to get a new belt and see if that will let it run quietly under less tension.

Thanks, everyone, for the tips and assistance.


-- ~Steve

View Ripper70's profile


1378 posts in 1755 days

#7 posted 02-19-2018 10:08 PM

Nice job Steve. I think you just saved yourself at least $300 bucks!

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

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