XCMG QUY100 Crawler Crane Top Roller material is 40Mn2, production technique is forging, heat treatment is whole quenching and tempering, and surface hardening, hardness is HR40-50. When top roller worn out to extreme dimensions, you can repair by welded, or even replace new top roller.
2. Other parts
Such as XCMG QUY100 Crawler Crane track pad, track roller, carrier roller, idler and sprocket.