129327A1 Pin boom to swing tower 590SL Series 2 Fits Case 590SL, 590SL Series 2,One New Aftermarket Replacement Boom to Swing Tower Pin Fits Case (Fits Case IH) Backhoe Loaders This heavy duty pivot pin connects the backhoe boom to the swing tower on Fits Case 590 and 590SL series backhoe loaders. Two pins are used per machine and are sold individually. The pin is a precision fit structural component subject to continuous load and wear inspect and replace as needed to maintain proper boom alignment and safe operation.