Pins do have a split ring, hole in each end of ther pin, you thread the split ring thru the end hole to keep the pin in. JD part number AL114597
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HOw to loose linch pins blowing snow! I believe how it happens is..... We all hit things (curbs etc...). Because to many of the blowers are attached to a 3 pt hitch arms with a pin that is not a clevis style. The pin sticks out from one side mount of the blower, as apposed to a clevis mount, bends with a hit and abrupt stop. After the pins bend every force there after forces the arms off center thus putting pressure on the linch pin. Metal fatigue acts on the linch and eventually breaks.