
If your tractor is using less than 80% of power required, it would be a smart decision not to yet invest in a cooler and faster tracker. This is because your tracker is still going strong, being able to yet still produce great results. Newer Tractors might not work maximally as well, causing unfruitful modernization to occur. Your newer devices will also cost more work hours, not to mention all the more exploitation costs.
If your faithful tracker is still going strong, hold back on getting newer machinery until it is absolutely necessary (more than 80% of power required).