The PC18MR-2 and PC20MR-2 compact excavators have operating weights of 4,090 and 5,060 pounds, respectively. They both use Komatsu engines, rated at 15 horsepower for the PC18MR-2 and 20 horsepower for the PC20MR-2. As do all Komatsu excavators, these models feature the company's HydrauMind hydraulic system.