VD Chipmunk Jaw Crusher - BICO Inc.Exceptional crushing capacity with minimum power consumption is obtained by unique moveable jaw principle. The upper end of the jaw travels in a circular path driven by the eccentric shaft. The lower end oscillates through a short arc described by the toggle. The resultant jaw action is a forward and downward motion.vd chipmunk jaw crusher,bico chipmunk jaw crusher - BICO Inc.Jaw plates are tough, thick steel and are reversible end for end for double wear. Heavy bronze bearings are sealed against dust and dirt and are lubricated by grease cups so that no special greasing tools are required. INSTRUCTIONS. The Flat Faced Pulleys on the VD and WD Crushers as run with V-Belts is a specially.