When it comes to the anatomy of an excavator, most operators and mechanics immediately think about the boom, bucket, or hydraulic pump. But deep inside the undercarriage and swing frame lies one of the most critical — yet least appreciated — structural components of the whole machine: the X-frame . It doesn’t move oil or lift dirt, but the X-frame  forms the structural spine  of your excavator’s lower body. It’s what keeps the tracks properly aligned, the upper structure stab