The ZX120-3 Hitachi excavator is fitted with an Isuzu model 4JJLX engine. This four-cylinder engine offers a maximum power output in the range of 93 horsepower. The piston displacement on this Isuzu engine is 184 cubic inches. This engine is a turbocharged, air-cooled engine. The ZX850LC-3 models feature an Isuzu model AH-6WG1XYSA-03, six-cylinder, 532-horsepower engine. This turbocharged engine offers a 957 cubic-inch displacement.
The Hitachi ZX120-3 excavator was designed to a length of 25 feet, 4 inches. This excavator is 8 feet, 10 inches tall from the ground to the top of the cab. Models fitted with the shorter arm offer a 27-foot, 4-inch maximum reach, while models fitted with the longer arm attachment offer a maximum reach of 28 feet, 10 inches. Short-arm models can dig to a maximum depth of 18 feet, 3 inches. Models featuring the longer arm can dig to a maximum depth of 19 feet, 11 inches. These excavators offer a 9-foot, 2-inch ground track length and a 17-inch ground clearance. Models of this excavator can be fitted with 20-inch, 24-inch or 28-inch front blades. Maximum cutting height achievable with this excavator is 28 feet, 1 inch. ZX850LC-3 excavators are between 15 feet and 18 feet, 6 inches tall and between 48 feet, 6 inches and 48 feet, 8 inches depending on the arm attached. Maximum reach as well as dig depth differ among ZX850LC-3 models of Hitachi excavators. Depending on the model, they can reach to between 40 feet, 6 inches and 52 feet, 2 inches and dig to a depth of between 23 feet, 5 inches and 29 feet, 1 inch.
The automatic transmission system on the ZX120-3 offers two gears, a high speed of 3.4 mph and a low speed of 2.1 mph. These excavators are fitted with twin 12-volt batteries, a 50-amp alternator and a 5,512-lb. counterweight. Hitachi's ZX850LC-3 models feature twin, 12-volt batteries and are fitted with a standard 29,321-lb. counterweight. They can travel at a rate of 1.9 mph in low gear and 2.5 mph in high gear.
The main hydraulic pump on the ZX120-3 pumps hydraulic fluids at a rate of 27.7 gallons per minute. The entire hydraulic system holds a maximum of 35 gallons of hydraulic fluid. The fuel tank can hold a total of 66 gallons of fuel. The main hydraulic pumps on the ZX850LC-3 pump fluid at a 139 gallon-per-minute rate. The hydraulic system in this excavator can hold 137.5 total gallons of hydraulic fluid. The fuel tank can hold 296 gallons of fuel.
ZX120-3 models with the 20-inch rubber crawler pad that have not been fitted with a front blade weigh 27,117 lbs., while models with the same crawler pad that have been fitted with a front blade weigh 29,321 lbs. Without any front attachments, extensions or counterweights, the Hitachi ZX850LC-3 models of excavators weigh over 60,000 lbs. Counterweights and attachments can add several tons to this excavator's total weight.