There's a reason for maintenance free bearings and no zerks
The biggest killer to bearing spindles etc is grit. When you have an open zerk or grease built up around the spindles you are attracting dirt dust etc. when you push new grease in you are also pushing grit in inless you clean the zerk out.
Everything I have is maintenance free on automotive,tractors, or anything else. I hate zerks and open bearings
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