Your #1 Source for Excavator Hydraulic Kits & Front Window Guards Since 1996 HydrauliCircuit Technology is North America's largest manufacturer of Field Installation Hydraulic Kits for Excavators. Privately owned since 1996, HCT has been a leader in providing durable, reliable, custom-built, high-quality Excavator Hydraulic Kits and Front Window Guards that are easy to install. We are your trusted partner in providing superior engineering, high quality manufacturing, and lifetime support. Our hydraulic kits and guards are based on actual fitments and extensive qualification process, and come with detailed installation manuals that guide you through every step. Excavator Hydraulic Kits Coupler Kits Front Window Guards Parts & Sales