Manoeuvrability – a key efficiency driver
Moving into position without losing time
Despite its huge size, the 4200 SM is exceptionally manoeuvrable and easy to handle. This is due to the surface miner’s smooth hydraulic all-track steering system which permits large steering angles of all four track units. Two switchable flow dividers act as a differential lock and ensure uniform traction even when working on extremely diffi cult ground. The system permits three different steering modes: the rear and front tracks are steered in opposite directions when moving into position; the front tracks are steered to produce long, straight cuts; and all four track units are steered in the same direction in crab mode to enable lateral repositioning of the miner.
Effortless turning manoeuvres and modest space requirements increase productivity levels by keeping non-productive times as short as possible. This is enhanced even further by the miner’s continuously adjustable advance speed.
The components exposed to exceptionally high levels of wear and tear in the tough mining environment have additionally been given an even more robust design: the track units have undergone a complete redesign and pay for themselves quickly by a significantly extended service life. The machine frame has been reinforced especially at the pulley housing and at the connection to the cutting drum unit to optimize the stability of the miner.