hydraulic system, easy operation and safe. Mechanical description: the tires more than 800 need to cut, and cut into four pieces in general .the size of piece is 200-500mm. Notes for using tire cutter: a. Inspect the knives frequently, if appear obvious blunt, it should be maintain timely, and the service is 2-3 years. b. the oil in hydraulic station should be filtered and changed regularly. Generally filter once every one and half year. c. Wearing parts: rubber seals, delivered with another set when ship the machine to the buyer.