The Superlift JR-Series JR-100-27 is a Pneumatic (Air over Hydraulic) Jack and is a versatile model capable of working with a great variety of mining equipment when used with the appropriate extensions. This jack is commonly used with CAT, Komatsu, Hitachi or Liebherr equipment with a net weight of less than 300-Tons. Its large tires offer ease of movement and its compact design make it well suited for mobile applications.