1686685 Piston Fits Caterpillar ModelsOne New Aftermarket Replacement Track Adjuster Piston Fits Caterpillar (Fits CAT) Construction Equipment This aftermarket replacement track adjuster piston is a steel hydraulic piston with a 49. 96mm outer diameter, designed for the front idler position of the undercarriage track roller frame. The track adjuster piston maintains proper tension on the undercarriage chain by holding hydraulic pressure within the adjuster cylinder, preventing track sag,
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