ARO 637118-C Air Section Service Kit

ARO 637118-C Air Section Service Kit is a general repair kit for the air motor section of ARO diaphragm pumps, designed for 1" and larger Pro Series models (including 1", 1-1/2", and 2" pumps). It provides replacement seals and wear parts to rebuild the air side and restore reliable shifting, including O-rings, gaskets, spacers, a pilot rod, sleeves and bushings, retaining rings, screws, and other seals; some parts are model-specific while others are common across multiple ARO air motors. A key feature of this kit is the Simul-Shift valve, which helps ensure an ultra-positive shift signal and reduces stall-out risk. Per manufacturer notes, 637118-C is described as a general repair kit that may contain extra O-rings and parts that are not required for every model.