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No serrations on my rigs bolts. I just had to take some weight off of the axle to get it to rotate a bit. I had to loosen the nut on the other end of the bolt and it rotated just fine. Turn it only 90 degrees and try the grease gun again. Don't think that a new zerk means it will pass grease. If the bolt took grease before but now won't remove the zerk and check it to make sure it is not the culprit.
I grease mine every 6 months, a little squirt is all it takes. Don't forget to lube the pin and your hitch so they don't gall when traveling.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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