No you shouldn't MIX grease but that doesn't mean you can't repack the bearings.

 

true but i mean for 5-40hp
motors that are just getting regular maintenance. just a shot or two of grease. I wouldnt mess with pulling out and repacking the bearings unless it was an emergency

 

I might be able to send you a couple of tubes or more. I'm pretty sure my local supply house has them.

 

Home depot has it, auto parts stores, United refrigeration, it's out there, just gotta forget about grainger, they're too expensive anyway.

And no, DO NOT mix greases with different bases...it can cause separation, and lack of lubrication.

 

Maybe in Colorado but here nobody can even order it except one supply house who happens to carry it on the shelf.
But yeah I agree with the point forget about Grainger there's more fish in the sea or um.... grease on the shelves. [emoji1787]

 

Send or call mobile and ask them what is an alternative or who is a vendor close to you who might have it in stock. but I find it can be ordered and bought many places on the internet.

 

https://www.amazon.com/Mobil-Polyrex-Electric-Bearing-Grease/dp/B017WKDTSA

 

https://www.amazon.com/Mobil-Polyrex-Electric-Bearing-Grease/dp/B017WKDTSA

That link says...

[FONT=&amp]Currently unavailable.
[/FONT]
[FONT=&amp]We don't know when or if this item will be back in stock.[/FONT]

 

Lubriplate mag 1 is compatible. As is any other polymer grease

 

Yup....all about the base material.

Grease is basically oil suspended in soap (generic exanation).

Different base materials can cause that oil to separate, and drop out, leaving no lubricant.

We're in the open forums, so I always recommend no mixing bases......

 

https://www.machinerylubrication.com/Read/1865/grease-compatibility

 

Good lord you know it’s a bad sign when you go to all the local supply houses and ask for polyrex and they just look at you will a blank stare and say, “what” [emoji23]

I finally found it at the supply house we get big motors from, but I’m thinking to myself. Damn are all these motors just getting shot up with lithium? I mean if no supply houses carry it and no one ever asks for it then what is going on lol?

 

I even went to an electric motor rebuild shop and they just use lithium grease from the farm store. As far as I know almost every major electric motor manufacturer requires you to use mobile polyrex em.

 

Kinda-but-not-really-related question, since we’re talking about greasing motors…
On a motor that hangs sideways from its mounting feet, like sideways in a Leibert, should the motor ends be rotated 90 degrees so that the weep hole at the bottom of the bearing cap points down? Or does that even matter? I mean, I never see them that way.

 

Only if condensate in the oil is a concern. If the humidity is controlled and the moisture content of the oil is low (because you aren't buying that super cheap crap....) then I wouldn't worry much about it.

 

The following is from the Mobile PolyRxex EM spec sheet:

Mobil Polyrex EM greases have been shown to be compatible with a number of ExxonMobil lithium complex greases, as well as competitive electric motor
mineral polyurea products, as determined by the methodology of ASTM D6185. For specific questions about grease compatibility, contact your Mobil
representative

No it is not recommended to mix different types of greases, but it has been my experience that it takes a very long time or a very fast RPM for signs of non-compatibility to show up and it might even be at the end of the bearings life. Something to think about and maybe do an experiment with How much grease do you have to pump through a bearing before the old grease has been replaced by the new grease or the old grease becomes such a small concentration that it has no effect. (similar to the recommendation not to mix refrigeration oils). The only way you can tell if bearing failure is due to grease compatibility is the cut the bearing apart and do an analysis of the failure. Owners don't really care what caused the failure (they just want it fixed), unless it costs them lots of money like stopped production which might cost hundreds of thousands or millions of dollars in lost production or when reliability is the utmost importance

 

I couldn't find Polyrex EM anywhere local during the supply chain woes, most online outlets were quoting several weeks delivery. I went to our motor rebuild shop and they hooked me up, give them a try if you have one nearby.