With an astounding 1000 tons of operating weight, the 6090 FS is the world's largest excavator. It has a total engine power of 3360 kW / 4500 HP with twin Cummins QSK60 engines. When Caterpillar expanded its mining capabilities with a purchase from Bucyrus in 2011, they were initially launched in 1997 that can fill only four large Caterpillar garbage trucks (797), which can fill based on the Bucyrus RH400, with its 93.6 tonne load based on 6090 FS 52 m3 bucket with its 93.6 tonne load.

Originally released as the Terex RH 400 and rebranded when Bucyrus bought the Terex mining division in 2010, this model has an operating weight of 980 tons. With the same engine capacity as the Caterpillar 6090 RS, it requires six car batteries to simply start the engines. Previously, the hydraulic mining excavator set the world record for its ability to move up to 9,900 tons of material in a single hour. Previously, it held the title of the world's largest excavator before the Cat 6090 FS was introduced.

The largest excavator in the Hitachi fleet, the EX8000-6 offers the versatility of being equipped with a 43.3 m3 backhoe bucket or a 40 m3 loading bucket. With an operating weight of up to 837 tons, it can fill the largest Hitachi dump truck (EH4000AC-3) in just five passes. Twin Cummins engines provide a combined capacity of 2900 kW / 3888 HP. From the point of view, Hitachi's flagship mining excavator EX1200-6 has an engine capacity of one-sixth of that!