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My Milwaukee 4 1/2 was making noise

H

hofferwood

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May 8, 2010
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DownRiver Michigan
Well I've had this for about 8 yrs.
Got it new and it's been kind of loud from day one. Now as old as it is, there's probably less than 3hrs total run time. And every time I'd use it I would mutter "Gotta open that thing up"
Today I did.

Picture951.jpg


Lotsa grease---just not on the gears
Picture952.jpg


Dry
Picture954.jpg


Looks like come wear on the little "bull" gear, but note how clean the grease is.
Picture955.jpg


Cleaned her out and packed her with "red lube of love" NOT
Picture956.jpg


grease
Picture957.jpg


Ready to knock some rivet heads off of a bed frame------garden trailer to be---angle iron
Picture967.jpg


All done and sounds great
Picture965.jpg


I'll run it 'till it breaks :)

Check yours

Chuck
 
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CJKaz

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Gear contact pattern is less than ideal. Pinion gear should be shimmed to center the contact to the middle of the bull gear's tooth. Google spiral bevel gear contact for images of the correct pattern. Likelly the cause of the excessive noise.

Original grease amount was sufficient. Excessive fill will cause overheating due to churning. Grease works by liberating its oil once it reaches operating temperature. If you dig deep into a grease specification, the ISO viscosity of the oil is given. While the grease is thrown off the teeth in operation, the light layer of oil is there.
 
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H

hofferwood

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Messages
922
Location
DownRiver Michigan
1320stang said:
Wow, assembly fail!! Nice job!
Click to expand...

Thanks 1320

cmandp said:
That's not what I meant. I was commenting on the fact that they haven't been made here in quite awhile. Either way you're right.
Click to expand...

Told ya it was old:D

CJKaz said:
Gear contact pattern is less than ideal. Pinion gear should be shimmed to center the contact to the middle of the bull gear's tooth. Google spiral bevel gear contact for images of the correct pattern. Likelly the cause of the excessive noise.

Original grease amount was sufficient. Excessive fill will cause overheating due to churning. Grease works by liberating its oil once it reaches operating temperature. If you dig deep into a grease specification, the ISO viscosity of the oil is given. While the grease is thrown off the teeth in operation, the light layer of oil is there.
Click to expand...

Thanks Scooter,
I'll "Blue" it up next time.
PC120335.jpg
 
W

wxm

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Dec 15, 2008
Messages
901
Location
NJ
So does it actually lower the noise? I have a Milwaukee that is very loud too, am interested in the outcome.
 
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MFGENG

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Jul 21, 2011
Messages
79
Interested in the noise aspect too. I love to get my HF grinders quieter.
 
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H

hofferwood

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Messages
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Location
DownRiver Michigan
wxm said:
So does it actually lower the noise? I have a Milwaukee that is very loud too, am interested in the outcome.
Click to expand...

It quieted mine down (read the comment over the last pic in the original post)
On the Milwaukee just turn the guard so the "open" part faces the back, it pulls right off, then 4 screws. Very easy

MFGENG said:
Interested in the noise aspect too. I love to get my HF grinders quieter.
Click to expand...

Here is a HF 7" sander/polisher.

PC110318.jpg


Grease was ok, the noise on this one was this bearing.

Picture979.jpg


Dried up HARD grease

Picture981.jpg


Cleaned

Picture982.jpg


Repacked

Picture983.jpg


Resealed

Picture985.jpg


It looks "over packed" but it's not, lots of expansion space in there.

Picture988.jpg


It is now quiet also

Chuck
 
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H

hofferwood

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Messages
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Location
DownRiver Michigan
cheechi said:
OK so if I was going to buy one of those greases to do this it's unclear from the 'NOT' that you're recommending the red or just used what's on hand.
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cheechi,
I'm sorry for the confusion.
The "Red Lube of Love" was a "Poke" at some of the ratchet lube guys---This is RLL
rll.jpg


The "Prussian Blue" is a contact indicator. It will show the contact area of two surfaces. Not a lube---A little poke at "Scooter"

The Grease I used was on hand--better than DRY

This is a quote from Merkava_4
"
The problem with grease in power tools is it works the best while it's being compressed in a pressurized environment; power tools don't offer that. You can pack a gear housing full of grease and the gear will cut right through it, leaving itself dry even though it's surrounded by grease. The best remedy I've found for that is to use a low viscosity grease with high adhesive properties. The tan colored Sta-Lube All Purpose grease has been working real well in my Bosch grinder."

I will recommend that grease if you use them hard and often.

But even "Lard" would be better than dry:lol_hitti
 
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cheechi

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Feb 29, 2012
Messages
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Location
Triad, NC
hofferwood said:
But even "Lard" would be better than dry:lol_hitti
Click to expand...

The ladies keep telling me that.

Anyway thanks for the clarification. The low viscosity makes sense (for hand tools at least) theoretically you could just give the tool a real good shake and it will shift the packing enough to coat one gear at least. This is one of those things I don't know if I need to do it yet since my current grinders are both pretty much new since the last ones died. I might open one up and see how it looks from the factory, but I'm definitely saving this for when I do need it.
 
I

Ign

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Jul 7, 2006
Messages
12,769
Location
Butte Peak ND
If that's the 8amp version I've had one for almost 10 years now. Got rebuilt under warranty after about a year (let the magic smoke out, but I was pushing it pretty hard) and it's been great since.
 
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