... Original CAT EFI engine. 3.CAT329D undercarriage JVR400D Rotary Drill RigTechnical Specification Max. output torque(KN.m)180Max. ... flexible, 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 ...