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Wheel Bearings

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Goat:

--- Quote from: maddoggy on June 06, 2010, 01:07:43 PM ---a bearing that is lubed by grease must not be filled past 1/2 way with the proper grease. overfilling with grease results in churning which develops excess heat. heat + bearings = spalling or other bearing race damage. trust me, i have been trained by timken bearing company.

--- End quote ---

That's great advise. I did not know that. Thanks

Friar-Tuck:
 The sealed bearings are just like the kids sealed bearings on their skateboards, The only way I found out about that was after the boys ruining good bearings. I got Better ones and they came with instructions for cleaning and care.
    I just never thought to post anything like that, Thanks #42,!
 
 I didn't know about any more than 1/2 the bearing with the grease, Thanks Dawgy.
I did find out what happens when you do "Pack" them... the grease heated up and blew past the seals...
  Maybe I can find a post on removing and replacing the bearing seals.  You do have to work slowly, I have Ham fisted the first few apart and bent the thin steel "washer" the rubber was vulcanized to..
  I'll look for a post...
  Here's a pretty good write up for a bicycle bearing, pretty much what I've found the same for the bearings I've done.
http://maintainthatride.blogspot.com/2008/06/con-tent-thyself-get-it-its-supposed-to.html

And for what it's worth:
http://findarticles.com/p/articles/mi_qa5322/is_200412/ai_n21360835/
  Tuck\o/   

maddoggy:
actually, timken school taught me to fill the "free space" in a greased bearing cavity 1/3 to 2/3 full, but as a general rule i try to go with a happy medium. thus i recommend 1/2 way filled. the "free space" i'm refering to should be considered with any greased bearing application whether it be a wheel bearing cavity on your truck hub or a sealed individual bearing or whatever else you may work on. alot of mechanics pack their wheel bearings but fail to consider that the grease will not stay in the bearing when it heats up to normal operating temps. unless the entire cavity(free space) is filled to the proper level. i don't mean to sound like a know it all, i just know this info and figured i would share it.

KXcam22:
Also keep in mind that grease is just a clay or soap type medium (lithium, sodium, calcium etc) that is used to hold a lubricating oil in suspension (essentially so it doesn't run out). The medium has a microsopic pourous structure like a sponge. I have popped off the seal on old bearings to add some grease but I have not regreased a new one. May have to try that. Cam.

KXcam22:
When I got my new motorcycle trailer I regreased both wheels. One had no grease and one had water instead of grease. Hmm. Cam.

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