If your Manitowoc ice machine is only producing partial ice grinds, it could be a blade problem, such as a broken blade or even un-sharpened. It could also be from dirt n the condenser fin blades. You can try taking the machine apart carefully and using a can of compressed air to clean out any dirt.
If your Manitowoc Ice machine is only making partial grinds of ice, it is most likely due to a blocked or torn filter. You can contact Manitowoc Ice company for assistance at 800-545-5720 or 920-682-0161 for additional assistance.