The Case CX31B mini excavator has a Yanmar 3TNV88-BPYB direct injection, four-cylinder, diesel engine producing 28.4 net horsepower (HP). It has a fully hydrostatic drive system and an operating weight of 6,679 pounds (3,030 kg). It comes standard with center swing boom with zero tail swing, foot pedal swing-boom control, hydraulically-controlled backfill blade, pilot controls and proportional flow hydraulics, and a one-piece, swing-out side access panel. It is also equipped with a rollover protection system (ROPS) and falling object protection system (FOPS) canopy.

Its undercarriage consists of rubber tracks with sealed and lubricated track rollers.