Source:Liebherr
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Liebherr’s new A 922 Rail Litronic Excavator can be equipped with a range of undercarriage options, enabling it to be used on both railway and road construction projects.
A rail travel drive is mounted on both sides of the dual-tire wheeled undercarriage. When the excavator enters the tracks, the rail travel drive lifts the tires to rail height, allowing the inside wheels to rest on the tracks. Liebherr says direct contact between the rubber tires and the rail delivers high travel speeds and traction for towing trailers or wagons.
The A 922 Rail is powered by a 163-horsepower Tier 4 Final diesel engine. The standard automatic idling function reduces the engine speed to idle as soon as the operator lets go of the joysticks. The engine will return to its original speed as soon as proximity sensors in the joysticks recognize the operator’s hand moving toward the lever again. This ensures that the set engine speed is available immediately, Liebherr says, which results in fuel saving and reduced noise.
A variable displacement double hydraulic pump with independent control circuits allows hydraulic attachments to be operated independently of the excavator's working and travel movements. For improved performance, flow capacity has been increased to 2 x 58 gallons per minute. The counterweight was also redesigned to improve lift capacity and weight distribution while reducing the rear size to 78 inches wide.
Two-Person Cab
The spacious cab features a double seat layout for two-person operation, which is required in many countries for safety monitoring while working on railroad tracks. Entry lights illuminate the doors for easy entry and exit. Large glass windows and standard rear and side cameras provide all-around views of the jobsite and swing range.
Three seat options are available – standard, comfort and premium – with even the standard option offering suspension, heat, a headrest, lumbar support and other features.
Machine data, cameras, automatic air conditioning, Bluetooth and other operational functions can be controlled via two 9-inch touchscreen displays. Quick access keys can be programmed by the operator for frequently used menu items.
