LiuGong Machinery Corp., founded in 1958 in Liuzhou, China, has redesigned two of its mini excavators, introducing into the lineup what it says is a 15% increase in productivity over previous models. Applications for the 904C and 906C include those with tight constraints, such as urban construction, landscaping, building site excavation, road maintenance, and trenching for water supply or drainage.
LiuGong engineers optimized the hydraulic systems to improve precision, promoting a 15% increase in cubic meters of materials handled per hour. In addition, fuel consumption is reduced by 10%. And, a stronger upper frame design increases durability. Filter locations are easy to access and service, and electrical components are located in the cab to shield them from vibration.
The two machines feature a KYB hydraulic system with a four-pump configuration for precise control while traveling and working. Swing torque was increased by 5% for improved pushing power. Both the 904C and 906C offer high torque at low engine speed, enhancing fuel efficiency, lowering noise, and extending engine life.
Multiple hydraulic attachments provide flexibility for different job requirements. Attachments include the optional quick coupler, hydraulic breaker, grapple, a tilting bucket, and a dozer blade. Optional buckets are available from 0.058 to 0.14 m³ (2 to 5 ft³).
Increased legroom was added to both the 904C and 906C, making getting in and out easier. More cab storage space was also added, along with improved air-conditioning. Controls are ergonomically located in the cab and console mounted for operator convenience.
LiuGong designers ensured that commonly serviced parts are easy to access. For example, the company says that unlike most machines with the main control valve under the cab, the 904C’s main valve is within easy reach on the left side of the machine. Both machines also feature easy-access filter locations. On the 904C, the fuel fill, at ground level for easy filling, is recessed to protect it from damage. Both machines have engines with air precleaner systems that increase reliability and run time on dirty job sites.
The 904C is LiuGong’s most compact excavator, with an operating weight of 4000 kg (8820 lb), rated power of 27.1 kW (36 hp), and a track gauge of 1220 mm (48 in). Standard rubber tracks enhance grip and are especially useful on paved surfaces. It features a standard bucket capacity of 0.11 m³ (3.9 ft³) and a reach of 5350 mm (210 in). Its digging depth is 3100 mm (122 in), dumping height is 3600 mm (142 in), and breakout force is 25.9 kN (5822 lb). It has a top speed of 5.2 km/h (3.2 mph).
The Tier 4 Interim Yanmar diesel-powered 906C is slightly larger than the 904C, operating at 6000 kg (13,230 lb). It has a rated power of 36.2 kW (49 hp) and a track gauge of 1500 mm (59 in). On the 906C, the 400 mm (15.7 in) steel track is standard. Its maximum reach is 6250 mm (122 in), digging depth is 3875 mm (152 in), and maximum digging force is 39 kN (8767 lb). Its standard bucket offers 0.21 m³ (7.4 ft³) of capacity. Its maximum travel speed is 3.7 km/h (2.3 mph).
LiuGong supports its 12 product lines, which also include wheel loaders, bulldozers, and forklifts, via a network of 119 dealers in six continents, as well as eight parts depots strategically located around the world. In 2008, it opened LiuGong North America in Houston.