jockey pulley Material:ZG55 ZG35SiMn Weight:2.89t Process: sand casting +machining Description: to support belting leather on the cement mill and belting leather support cylinder then the big gear ring push the cylinder to rotates Function:  jockey wheel is a retractable adjustable-height wheel used on the front of trailers with either a single axle (two running wheels) or more close-coupled axles at or near the centre of gravity whereby without additional support, the trailer would not remain 'level'.
