Re some of the soil around Yass, reminds me of a Victorian harvesting contractor I knew who was one of those who used to travel a fair bit chasing the wheat harvest. Also in late autumn and sometimes into winter did a fair bit of rice in southern NSW. There was one wheat harvest in the 1980's when after finishing elsewhere, he took on a job of something like 1,000 acres of wheat in Yass area that others had not had much success at trying to harvest. Apparently even headers with dual wheels on the front and hydrostatic drive on steering wheels on the back. They would regularly break through the dry hard surface crust into the slop underneath. He was successful using tracks instead of the normal front wheels. The pressure exerted on the ground by tracks is relatively light and spread fairly evenly over a much larger area than any tyre, which has the problem of weight largely being just under the axle. Gather was not a very pleasant job for operators driving header on tracks for long periods on hard ground with no cushioning effect that tyres have and also vibration. Normally tracks are only used on headers when they cannot keep going in very wet conditions with the usual rice tyres. These have lugs like tractor tyres but much longer and further apart. Will still work in conditions worse than where normal tractor treads clog with mud and spin, but rough and high wear rates on hard ground and especially on roads.


				
				
				
					
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