LiuGong infuses intelligence into new crawler excavators

  • 19-Jun-2011 10:56 EDT
915D Excavator.jpg

LiuGong's D-Series is the company’s new generation of intelligent crawler excavators (shown is the 915D) featuring computer-aided systems for greater operating efficiency, lower fuel consumption, and overall reliability.

LiuGong's new-generation D-Series crawler excavators are equipped with a Computer Aided Power Control system (CAPC) that automatically matches the machine’s hydraulic output flow to the application. At the touch of a button, LiuGong's new power boost feature instantly increases the excavator’s digging force up to 10% for 10 sec and then resets back to normal functions for the next task. The CAPC also allows the operator to select optimal power levels for peak performance capacity with the best fuel economy.

The 922D and 936D feature a heavy lift system that, when activated, increases hydraulic pressure to the attachment cylinders while simultaneously reducing attachment speed for better control during lifting operation. Also, the excavators are equipped with an emergency bypass switch to enable the machines to operate indefinitely in the event of an electrical problem with the main CPU or its related components. Fuel consumption, emissions, and noise are all improved by an auto-idle function that automatically lowers engine speed if there is no operation detected for 5 sec.

LiuGong's new rigid x-type crawler bodies on the D-Series distribute load stress throughout the frame. A larger beam section in the upper frame improves the excavator’s strength, durability, and stability by creating a better center of gravity. Oil-sealed track rollers, carrier rollers, and idlers on the undercarriage provide enhanced durability in rugged conditions. Wide trackpads of up to 32 in (813 mm) afford improved flotation and stability on soft ground conditions.

Standard rock guards and vertical strips protect the excavator’s arm from rock and debris damage.

In the cab, an easy-to-read LCD instrument panel displays 20 different machine control functions. The self-monitoring control system reads engine speed, fluid pressures and temperatures, lubricant status, and fuel capacity, alerting the operator if a function exceeds its parameter and preventing service issues from becoming downtime setbacks. Maintenance on the D-Series is safe and simple with ground-level side access panels to hydraulic pumps and engine filters.

Reinforced frames and silicon shock absorbers cushion impact and vibrations in the sound-suppressed, climate-controlled cabs that feature adjustable suspension seats, a multiple and positionable-vent large-capacity filtered air-conditioning system, a tinted sunroof, and AM/FM/MP3 radio. Pilot controls with a pattern changer feature allow the operator to control the D-Series excavator’s functions with less fatigue and more accurate control of the arm and bucket. Backup alarms and flashing beacons on the D-Series excavators assist jobsite safety, while rear-view mirrors provide a wide view of the operating area.

LiuGong’s factory-installed two-way auxiliary hydraulic circuit configuration supports additional attachments such as rock thumbs, hammers, and shears.

In terms of power, the three D-Series models are all equipped with Cummins Tier 3 engines. The 915D midsize crawler excavator offers 102 hp net (76 kW) and reaches travel speeds up to 3.4 mph (5.5 km/h). With a max digging depth of 19.25 ft (5.9 m), the 915D is suitable for residential and commercial site prep. It is available with an optional two-way dozer blade for back fill and leveling operations.

The 922D offers an electronically controlled, turbocharged six-cylinder with 142 hp net (106 kW) and is suited for road and highway applications. The 922D comes standard with a 1.31-yd³ (1-m³) capacity, 43-in (1092-mm) wide bucket.

LiuGong's largest crawler excavator, the 936D, features a 260-hp net (194-kW) engine. The 936D’s 35.75 ft (11 m) ground level reach and 33.58 ft (10 m) max dig height make the 936D suited for demolition and forestry applications. The 936D’s 2.09-yd³ (1.6-m³) capacity, 57-in (1448-mm) wide standard bucket lifts up to 18,869 lb (8558 kg) on side at a 20° radius.

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