Originally Posted by Gizmo0706
Could you define "flushing out"? I probably need to do some bearing work but but have been nervous of blowing out a seal or overfilling and getting grease into my brake drums from over pumping at the Zerk. I probably have 2 1/2 years and 4k miles on my current bearings with nothing other than added grease.
Added grease is what I was referring to. I use a hand grease gun (no air or electric) and slowly pump just until the black grease is replaced by the clean red and then stop. (This is just the dirty grease from the OUTSIDE bearing initially. It will be a short push until the INNER bearing's dirty grease works its way through to the outside; then there will be quite a bit of dirty grease as the hub's outer race flushes out till fresh red shows up again.) See the graphic.
It should go in easy. If it squirts out the side or won't take grease with an easy pump, the Zerk is plugged and needs to be removed and cleaned or replaced. Trying to force grease into the Zerk will over pressure the hub and you risk seal damage.
Removing the hub to repack the bearings by hand can actually increase the risk of a damaged seal if the seal surface comes in contact with the axle's threads; scoring it.
I have found that using the EZ-Lube (or Ultra-Lube) system regularly, reduces the risk of seal damage and increases bearing life. Obviously, your experience may differ. Not promoting it; just saying you paid for it when it was shipped with the trailer, so you might as well use it.
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