Major updates to Topcon’s flagship 3D dozer machine-control system extends application of the mastless 3D-MC Max blade-automation system for the first time to the four-way pusher class of dozers (3D-MC max was initially released in 2016 for six-way dozers). The update also includes an optional third inertial measurement unit, enabling pitch-controlled blade guidance. The third IMU is also available as an addition designed to improve performance on steep inclines. Another new feature improves blade-wear management to improve accuracy. The 3D-MC Max upgrades are available initially on 150 hp and larger dozers from Caterpillar, John Deere and Komatsu.