Universal Impact Crushers : McLanahanMcLanahan Universal Impactors also feature optional PLC automated adjustments. Automation in McLanahan's Universal Horizontal Shaft Impact Crushers.how to adjust impactor crusher,how to adjust impactor crusher,Hazemag: Impactor Anatomycontrolled hydraulic adjustment. system for the impact aprons allows. for quick gap adjustments, optimum. control over the product size,. smoother crusher.