Electric angle grinder gearcase lube, what are you guys using?

redwrench60 · Nov 12, 2013

I picked up a good condition used Dewalt 7" 15 amp angle grinder (not a China or Mexico made one) and I'd like to grease the gearcase before putting it in service. What to use?

signcrafter · Nov 12, 2013

I'm also interested in this. Always wondered if some high temp grease would be fine or if it takes something special. I know mine heats up pretty good, almost to the point you can't touch it if I"m using it for a long time. Probably should change the grease on that one.

CWP1616L · Nov 12, 2013

Sta-Lube SL3310. My grinder runs so smooth, it sounds like a blow dryer.

gtermini · Nov 12, 2013

Royal Purple Max-Tuff Assembly Lube. If it's good enough to break in my 12V Cummins, it's good enough for my grinder.

Greyson

zkling · Nov 12, 2013

I use Lucas red n tacky #2, it is my general purpose shop grease. Every year I repack it. Keeps it running smooth, and I show my grinder no mercy. Was using it a few hours ago actually. :thumbup:

Can you post a pic of your grinder? Roughly how old is it? I'm curious on the COO now that you mentioned it. Is it one of the older metal case one?

signcrafter · Nov 12, 2013

How much do you put in? Just fill it full? How do you guys clean the old grease out, just scrape out what you can and put new in?

redwrench60 · Nov 12, 2013

zkling said:
I use Lucas red n tacky #2, it is my general purpose shop grease. Every year I repack it. Keeps it running smooth, and I show my grinder no mercy. Was using it a few hours ago actually.

Can you post a pic of your grinder? Roughly how old is it? I'm curious on the COO now that you mentioned it. Is it one of the older metal case one?

Not a metal housing model. According to the label it's made in Italy...that's gotta be better than China right? :lol:

Seriously it's a stout beast, runs good and the price was right. Don't know exactly how old it is but this particular model has been discontinued.

1953mercury · Nov 13, 2013

Walmart wheel bearing grease in mine. Seems to like it. Mike

24X26 · Nov 13, 2013

Any grease is better than the little to none they put in at the factory. And use the guard on it...

dadsEH · Nov 13, 2013

Dewalt recommend Polyurea grease for high speed heavy loads....google is your friend.

zkling · Nov 13, 2013

dadsEH said:
Dewalt recommend Polyurea grease for high speed heavy loads....google is your friend.

Can you provide a link please?

dadsEH · Nov 13, 2013

Google....DW474
Its even got a parts list assembly dwg!

zkling · Nov 13, 2013

Was I asking too much work of you to post the link? :dunno:

http://www.ereplacementparts.com/grease-oem-p-90565.html

$30, are they serious? :lol:

Think I'll stick with my red n tacky. YMMV :beer:

Provincial · Nov 13, 2013

Polyurea grease is used for electric motor bearings. Check with your local electric motor rebuilder. Phillips 66 makes "Polytac" polyurea grease in standard and EP (extreme pressure) varieties.

Edit: It looks like John Deere is a source for polyurea grease: http://www.ebay.com/itm/Mini-Grease...799?pt=LH_DefaultDomain_0&hash=item3cd0d7e9df

e-tek · Nov 13, 2013

24X26 said:
Any grease is better than the little to none they put in at the factory. And use the guard on it...

Can't say I've ever used grease , or a guard, on any of mine! :dunno:

neophyte · Nov 13, 2013

Provincial said:
Polyurea grease is used for electric motor bearings. Check with your local electric motor rebuilder. Phillips 66 makes "Polytac" polyurea grease in standard and EP (extreme pressure) varieties.

Edit: It looks like John Deere is a source for polyurea grease: http://www.ebay.com/itm/Mini-Grease...799?pt=LH_DefaultDomain_0&hash=item3cd0d7e9df

I did a quick Google search, and it sounds like there are different Polyurea based grease types available. For high load applications the grease may need extra additives, so the John Deere grease may or may not be appropriate.

This is where I saw the info.

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showthreaded&Number=211205

"Polyurea greases generally have high dropping points. The other characteristic is that they leave much less dried sediment/leftover soap as the grease gets used up and replenished over time. that's why polyurea is popular as an elec. motor grease. motors are high speed and have tight tolerances, and a grease that doesn't 'build up' over time is desired.
SRI, specifically, is a lightweight product, ideal for hi-speed, low load applications like a motor.
For general industrial rolling-element bearings, however, lithium complex EP greases (using heavier base oils than those in SRI) are commonplace, and can be cheaper."

redwrench60 · Nov 13, 2013

zkling said:
Was I asking too much work of you to post the link?

http://www.ereplacementparts.com/grease-oem-p-90565.html

$30, are they serious? Think I'll stick with my red n tacky. YMMV

Lol......yeah I'm not trying to spend more on gearcase grease than I paid for the grinder.

I did some google searches on the model number and it returned all the usual wealth of useless info. Is the motor bearing grease Dewalt recommends suitable for use in the actual gear case? And like signcrafter asked I'd also like to get an idea of how much grease is appropriate in the gear case.

dadsEH · Nov 13, 2013

zkling said:
Was I asking too much work of you to post the link?

http://www.ereplacementparts.com/grease-oem-p-90565.html

$30, are they serious? Think I'll stick with my red n tacky. YMMV

Yeah, lm sure it will be fine.

sberry · Nov 13, 2013

Just re smear some of whats in the case around, do not pack it full and I have never really noticed much difference after fooling with one. I dumped a teaspoon of synthetic 80w90 in one for giggles, it seemed to work fine. My bet is next week we see a thread of,,, "what went wrong with my grinder" ?.

Gary S · Nov 13, 2013

I use Amsoil synthetic grease from my grease gun for all these type gearcases, and most other uses.

CJKaz · Nov 13, 2013

The proper lube for a high speed spiral bevel gear like this is NLGI 00 grease. Specified by Black & Decker industrial service document prior to Dewalt's takeover.

http://www.amazon.com/gp/aw/d/B001OKBHRK/ref=aw_d_pd_lawn-garden

Smallest reasonable quantity I found, no need for 55 gallon drum

Too heavy (like NLGI 2) and it won't drop the oil which is what is required to lubricate. Fill approx 1/2 full. Too much and it will churn excessively and overheat, draw excessive current. More isn't better with gearboxes.

e30bradley · Nov 13, 2013

i use wheel bearing grease, and never use the guard.

The Ratchet Man · Nov 13, 2013

I've been through 7 or 8 grinders in my life of varying quality...from HF to Metabo. Never had a gearbox problem. I always lose the motor first. I'm currently on a Dewalt corded and Dewalt cordless at the moment. I think I might pop them open just to see what's inside.To each his own though.

Edit: All my grinders have been the 4 1/2" variety if it matters. I'm sure larger ones would have different different stresses and weaknesses.

redwrench60 · Nov 13, 2013

CJKaz said:
The proper lube for a high speed spiral bevel gear like this is NLGI 00 grease. Specified by Black & Decker industrial service document prior to Dewalt's takeover.

http://www.amazon.com/gp/aw/d/B001OKBHRK/ref=aw_d_pd_lawn-garden

Smallest reasonable quantity I found, no need for 55 gallon drum

Too heavy (like NLGI 2) and it won't drop the oil which is what is required to lubricate. Fill approx 1/2 full. Too much and it will churn excessively and overheat, draw excessive current. More isn't better with gearboxes.

Aww hell, I've got some of that on hand. Snapper "00" grease.

zakmartin · Nov 13, 2013

Thanks to help from this and another website I use this grease:

Red Line CV-2 Synthetic

Loaded into this gun:

Dualco Grease Gun

Please note that I'm using these with my airtools. I'm not sure how they would work on your electric tool, but a high speed gear is a high speed gear. I use about 3 squirts every month or two and do an overhaul once a year.

Wayfastwhitie440 · Nov 13, 2013

Can someone post a picture of what yall are greasing because my grinders are loud and if I could do some preventive maintenance to keep it going for a long time would be great. THANKS

zkling · Nov 13, 2013

What grinder do you have? I have a 4.5" dewalt, there is just a plastic IIRC cover on top of the beval gear case, I clean the grinder real well to prevent grit from getting inside the gears. Open the case, clean old grease, put in new grease, replace cover and use. :thumbup:

redwrench60 · Nov 13, 2013

Wayfastwhitie440 said:
Can someone post a picture of what yall are greasing because my grinders are loud and if I could do some preventive maintenance to keep it going for a long time would be great. THANKS

Just remove the grinding stone/cutoff wheel/cupbrush/flap wheel ect. and then the 4 screws that hold the spindle housing to the gearcase. Clean the grease out and re apply. Easy peasy.

Wayfastwhitie440 · Nov 13, 2013

Got it thanks a ton. Love the glock blueprints under the grinder

outdoorsman310 · Nov 13, 2013

whatever is available. I think i used lithium general purpose grease last time. the excess seeped out.

Dugan · Nov 14, 2013

e-tek said:
Can't say I've ever used grease , or a guard, on any of mine!

Im with you.. never even thought about it and I abuse mine. But then again it is a hilti...

redwrench60 · Nov 14, 2013

Dugan said:
Im with you.. never even thought about it and I abuse mine. But then again it is a hilti...

I hear what you guys are saying but I figure if five minutes of effort makes an expensive tool last longer than why not right? To Dewalts' credit this one had plenty of good clean lube in it already so it probably didn't really need it.

Electric angle grinder gearcase lube, what are you guys using?

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