JRK Electric and Hydraulic Shovel Undercarriages are designed to maximize mechanical properties. Both come in either a heat treated high grade alloy or austenitic manganese. In all of our large shovel undercarriage offerings you will find optimized internal structures that provide a continuously supported roll path to withstand crushing and fortified track lugs that combat stretch. We also use forged rollers that possess a tighter grain structure and induction harden all wear surfaces. All of these innovative features combine guarantee maximum performance and longer wear life.