English: Caterpillar Seventy Five crawler tractor ploughing. One of several Caterpillar crawler tractors to be seen at the Little Casterton working weekend in September 2009. This crawler was working a Ransomes 6 furrow trailing plough and the most important thing to remember is to pull the rope to engage the mechanical lifting mechanism that relies on forward motion. Too late and you are in the hedge with a plough you can't lift out of work.