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High Speed Electric Motor Grease #4611817
12/23/17 05:27 AM
12/23/17 05:27 AM
Joined: Apr 2017
Posts: 16
N/A
TurboDieselPoint Offline OP
TurboDieselPoint  Offline OP
Joined: Apr 2017
Posts: 16
N/A
Hi All,

I am restoring an old Hoover vacuum cleaner. One end of the motor shaft rides in a K-65 caged needle bearing. I have replaced this bearing with an identical new one (link below) but would like to know what would be the best LIFETIME grease for this bearing and application--I don't want to have to take this thing apart again.

When I re-assembled the motor with the new bearing for the first time, I used some unknown dark grey grease with the consistency of Miracle Whip. This grease sample was given to me by a machinist--he pumps it out of a grease tube gun into the grease points of lathes and mills etc--but I don't know how well it will last in this potentially higher speed and higher temperature application. Is it likely that the volatile compounds will vaporize out of the grease, leaving behind a gummy residue and a loud bearing?

https://www.amazon.com/Koyo-J-65-Bearing...ds=j-65+bearing

Thanks.

Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4611908
12/23/17 07:40 AM
12/23/17 07:40 AM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,949
Illinois
Synthetic wheel bearing grease?


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4611964
12/23/17 09:04 AM
12/23/17 09:04 AM
Joined: Dec 2015
Posts: 420
Kentucky
Fsharp Offline
Fsharp  Offline
Joined: Dec 2015
Posts: 420
Kentucky
Something that meets NLGI GC/LB - the highest rating for wheel bearings and chassis.

Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4612040
12/23/17 09:57 AM
12/23/17 09:57 AM
Joined: May 2003
Posts: 9,362
Central Coast, Calif.
tom slick Offline
tom slick  Offline
Joined: May 2003
Posts: 9,362
Central Coast, Calif.


You get what you pay for...
So keep in mind how much you paid for this advice.
Re: High Speed Electric Motor Grease [Re: SHOZ] #4612155
12/23/17 11:42 AM
12/23/17 11:42 AM
Joined: Dec 2016
Posts: 7,132
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,132
Waco, TX
Originally Posted By: SHOZ
Synthetic wheel bearing grease?


+1 ... it is what I would have used.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4614336
12/26/17 03:21 AM
12/26/17 03:21 AM
Joined: Apr 2017
Posts: 16
N/A
TurboDieselPoint Offline OP
TurboDieselPoint  Offline OP
Joined: Apr 2017
Posts: 16
N/A
Thanks for the advice, all.

When I looked up the products you all recommended, I stumbled upon this stuff called Mobil 1 Polyrex EM, designed specifically for electric motor bearings. This one seemed like a no-brained, but I still wanted to get a second opinion here. Although it is for electric motor bearings, perhaps it is intended for larger, industrial electric motors which could run slower and cooler than the one I am looking at.

What do you think? Polyrex EM or synthetic wheel bearing grease?

https://www.mobil.com/English-US/Grease/pds/GLXXMobil-Polyrex-EM-Series

Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4614350
12/26/17 04:29 AM
12/26/17 04:29 AM
Joined: Apr 2017
Posts: 16
N/A
TurboDieselPoint Offline OP
TurboDieselPoint  Offline OP
Joined: Apr 2017
Posts: 16
N/A
And, for that matter, do you guys have tips for stuffing as much grease as possible into that little drawn cup, caged needle bearing (J-65)? I want to fill it as full as possible, then just let the extra leak out as the motor runs.

The bearing has no grease hole, so I just scooped grease onto a Q-tip and worked it in between the rollers as best as I could. I suspect I may be able to get even more in there with a better technique. Perhaps a syringe with a hypodermic needle?

Any tips would be appreciated. Thanks.

Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4614397
12/26/17 07:07 AM
12/26/17 07:07 AM
Joined: Dec 2016
Posts: 94
Indiana, USA
Smoqueed Offline
Smoqueed  Offline
Joined: Dec 2016
Posts: 94
Indiana, USA
Tbh I could hit it with some superlube. As to pumping the grease into it, you can try a syringe, just make sure to get a fat needle on there. Pushing out something as viscous as a wheel bearing grease might be a pain

Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4614715
12/26/17 01:28 PM
12/26/17 01:28 PM
Joined: May 2003
Posts: 9,362
Central Coast, Calif.
tom slick Offline
tom slick  Offline
Joined: May 2003
Posts: 9,362
Central Coast, Calif.
Donít pack the bearing full. It will heat up and fling the grease out if overfilled. It should be filled 50 to 80%.


You get what you pay for...
So keep in mind how much you paid for this advice.
Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4615405
12/27/17 07:15 AM
12/27/17 07:15 AM
Joined: Apr 2017
Posts: 16
N/A
TurboDieselPoint Offline OP
TurboDieselPoint  Offline OP
Joined: Apr 2017
Posts: 16
N/A
That was my goal. Overfill it, then let it it fling out the extra grease it doesn't want. If it makes a mess, that is ok; I can clean it up. I just don't want it to have it underfilled.

Just curious, how does one determine how full a bearing is? What would constitute 50% full, for example?

Thanks!

Last edited by TurboDieselPoint; 12/27/17 07:16 AM.
Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4615514
12/27/17 08:44 AM
12/27/17 08:44 AM
Joined: Jun 2003
Posts: 5,949
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,949
Illinois
Many industrial motors have grease zerks for the bearings. And the motor usually fails from too much grease.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4616196
12/27/17 08:42 PM
12/27/17 08:42 PM
Joined: May 2003
Posts: 9,362
Central Coast, Calif.
tom slick Offline
tom slick  Offline
Joined: May 2003
Posts: 9,362
Central Coast, Calif.
The extra grease makes extra heat from churning and will cause more grease to fling out than you intend to remove. It can cause failure.

There is a calculation for grease fill by bearing type and size. Itís a lot less than you think. For that bearing it would be a good coating plus a little bit more.


You get what you pay for...
So keep in mind how much you paid for this advice.
Re: High Speed Electric Motor Grease [Re: tom slick] #4617151
12/28/17 08:33 PM
12/28/17 08:33 PM
Joined: Dec 2002
Posts: 42,293
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,293
New Jersey
Originally Posted By: tom slick
The extra grease makes extra heat from churning and will cause more grease to fling out than you intend to remove. It can cause failure.

There is a calculation for grease fill by bearing type and size. Itís a lot less than you think. For that bearing it would be a good coating plus a little bit more.


Ive seen bearings that specify a mass as well.

Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4618403
12/30/17 12:52 AM
12/30/17 12:52 AM
Joined: Dec 2002
Posts: 41,527
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 41,527
'Stralia
Yep, there's calls and recommended masses.

About half full will do you.

If you've got a syringe, inject grease on the outside of the rollers, then remove it from the inside before installing. If you can't work the grease into it with finger pressure and rotation until it won't take any more, and then wipe the inside mostly dry.

If you can't then pack the inside without trying to get it to the outside, but it will leak more.

Tom Slicks point is a good one...if too full, it can empty itself when hot.

Re: High Speed Electric Motor Grease [Re: TurboDieselPoint] #4620982
01/01/18 06:25 PM
01/01/18 06:25 PM
Joined: Nov 2009
Posts: 24
USA
RDMgr Offline
RDMgr  Offline
Joined: Nov 2009
Posts: 24
USA
To select the correct grease base oil viscosity and approximate NLGI grade you need the motor speed and operating temp. Motor speed should be in the manual or on the motor tag. Op temp is probably unknown but 120F can be assumed. The Polyrex Em is the probably the closest grease named to the actual requirement. If motor speed is very high than a lower base oil viscosity will be needed.

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