... rotary drilling rig enjoy 1. CAT Undercarriage & Up Structure 2.Original CAT EFI engine JVR360D Rotary Drill RigTechnical SpecificationProduct ... especially suitable for narrow jobsites. JVR series rotary drill rig enjoy economic, efficient, environment friendly, stable performance ... same work condition.3. Hydraulic SystemJVR series rotary drill rig absorb international advanced design concept, use top ...