1.with cross-country, simple structure, easy-to-use, high operating efficiency, aesthetic appearance 2.Caterpillar engines XJ90Z-4 workover rig is a new workover equipment of highly efficient and stable development based on XJ90Z-3 workover rig,with cross-country, simple structure, easy-to-use, high operating efficiency, aesthetic appearance, the compositeadvanced performance advantages, the ...