Wide Angle PTO Shaft suppliers About Changheng Founded in 1995, Zhejiang Changheng Machinery Group Co., Ltd is now a modern enterprise specialized in development, design, manufacture, sale and service for agricultural machinery transmission systems, including agricultural pto shaft (driveline), gearbox, and other accessories in complete series. We've developed our own line of forging, machining, assembly, plastic injection, etc. We have our own CE testing facilities like Torque, Frozen and UV tester. We also designed our own Square testbay with monitered gearboxes and PTO shafts running over 1