All-rounder for rail and road
Road-rail machines can be used both on railway tracks and in road construction. Liebherr’s new ‘A 922 rail Litronic’ two-way excavator that complies with emission level V can be moved quickly thanks to its mobile undercarriage.
The basic machine, the rail running gear, the quick-change system, the attachment and all safety systems of the road-rail excavator are proprietary developments from Liebherr that are custom-designed for the machine. The ‘A 922 Rail’ is available in various undercarriage variants with different track gauges and railway wheels, enabling it to be used on tracks all over the world. An independent variable displacement pump for the railway running gear ensures traction and safe propulsion. The brakes are integrated as standard features in the railway wheels to shorten the braking distance in both the lowered and raised state, thus increasing safety.
New generation with more power
The new generation of the ‘A 922 Rail Litronic’ now has even more power. With a new 120 kW / 163 hp engine, a faster working speed is achieved, while the usual smooth working movements are maintained. Thanks to a variable displacement twin pump with independent control circuits from Liebherr, powerful hydraulic attachments can be operated independently of the working and travel movements of the roadrail excavator. The delivery rate of the variable displacement double pump is 2x220 litres per minute. In addition, a heavier ballast weight has been engineered in order to achieve the best payload values with improved weight distribution and a compact rear
swing radius of 2,000 millimetres. Access to key components has been simplified – air, oil and fuel filters, the main battery switch, the central lubrication point for the undercarriage, and the pilot valves for the hydraulic system can be reached much more easily. All maintenance points are easily accessible from the floor level. This shortens maintenance times and reduces maintenance costs.
Improved safety and higher productivity
The crew cab with standard rollover protection system (ROPS) has a colour touch-screen display for indication and operation. It is generously glazed and, in combination with the standard rear and side cameras, provides an optimum view of the working and swivelling area. The cab has improved access and entry lighting. The safety systems come from the company itself and include technologies such as load moment, height and pivoting angle limitations as well as a virtual wall. The wide range of Liebherr attachment tools makes the ‘A 922 Rail’ suitable for a variety of applications. To further increase productivity, the road-rail excavator can optionally be equipped with the fully hydraulic quick-change system developed by Liebherr. The combination of a hydraulic quick-change system with an automatic hydraulic coupling system allows mechanical and hydraulic attachments to be changed quickly and safely from the cab.