This machine using KOHLER engine has big power and low oil wastage. DELHPI special battery without maintenance can do self-charge when working, saving worry and durable. The scientific rack combination achieves the integrality of equipment structure. The strong load ability ensures the equipment cannot damnify because of the irregular crack. The screw changing speed endless can control the cutting depth, and track the road surface crack for opening groove. The amphi axletree of the principle axis use oil cup to lubricate, saving time and labor.