Case Construction Equipment SR250 and SV300 Alpha Series skid steers meet emission requirements for Interim Tier 4 certification.
The skid-steers now feature 90-hp, 3.4L Case diesel engines with the full high-pressure common rail (HPCR) design typically used in larger construction equipment. To meet Interim Tier 4 emission requirements, Case equipped the models with cooled exhaust gas recirculation (CEGR) technology, including diesel particulate filter (DPF) and diesel oxidizing catalyst (DOC). Case selected CEGR technology as most appropriate for the skid steers, where the engine typically runs at a high RPM.
Rated operating capacities are 2,500 lbs. for the SR250 and 3,000 lbs. for the SV300.
“Our upgraded Alpha Series models not only deliver best-in-class horsepower and industry-leading bucket breakout force – up to 8,585 pounds – but also more torque when you need it,” said Tim O’Brien, Case brand marketing manager.
He continued, “A 12% higher peak torque risecompared to the previous 3.2L engine translates into more power at 1400 rpm, while supporting faster recovery and improved reaction when the engine begins to lug.”
CEGR technology for Tier 4 is similar to that used in Tier 3, but now the fuel supply and exhaust gas recirculation process are controlled electronically.
The Case 3.4L engine in the upgraded Alpha Series skid steers features a new, patented piston design – specifically engineered for use in high pressure common rail (HPCR) fuel systems.
The electronic engine controls monitor EGR sensors and other inputs to determine diesel particulate filter (DPF) system regeneration needs. As a normal course of operation, the electronic controls will trigger an automatic regeneration of the DPF system. Additionally, the system can notify the machine operator to manually regenerate the DPF system occasionally when the soot load in the DPF exceeds the range defined for automatic regeneration.
The Alpha Series includes both radial-lift and vertical-lift models. The radial lift machines (designated with an R in the model name), are ideal for digging, prying and pushing, while the vertical lift models (designated with a V), excel on lift-and-carry applications.
The regular maintenance points are grouped in one area so operators do not need to walk around the machine to find specific service points. Maintenance points, such as the radiator, fuel filter, battery terminals and engine oil fill are easy to find under the engine compartment cover and door. A removable side panel provides access to the engine oil filter and environmentally friendly drain. Additionally, the oil cooler and radiator tilt out for easy cleaning.
It is important to use ultra-low sulfur diesel fuel with HPCR engines. Fuel systems in the upgraded Case Alpha Series models include primary filtration of impurities down to 10 microns, and secondary filtration to 3 microns. Change intervals for both filters are at 500 hours.