· Doosan equipment: DL550-3 and DL300-5 wheel loaders; DX490LC-5, DX420LC-5, DX350LC-5 . 30 years ago with a focus on demo work. That inspired the purchase of a concrete recycling machine which, along with a concrete crusher, led the pair to start a recycled concrete business alongside the razing. . a DX225LC-3 excavator dumps the stone into .