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I shoot a small amount of grease (just one pump) in each, about once per year. Every other year I have the dealer pull the hubs, check the brakes, and repack the bearings.
The zerks are fine to use to keep grease in there but there is a tendency to overdo it. Our dealer's service manager has told me repeatedly to put in just one pump per year, even when we are fulltiming. That still doesn't negate the need to repack bearings and check the brakes, though.
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