Caterpillar has four new D Series small-chassis models: 239D and 249D compact track loaders (CTLs) and 226D and 232D skid-steer loaders (SSLs): SSL models. The machines feature a sealed/pressurized cab, electro-hydraulic controls, redesigned lift arms, premium seat choices, and optional Advanced Display (available with rear-view camera). All use an electronic Cat C2.2 engine that meets Tier 4-final emissions standards.

The 239D and 249D are engineered for general construction and rental, while the 232D is designed with agricultural applications in mind. The 239D, with its suspended steel-embedded rubber track, replaces the 247B3 multi-terrain loader (MTL) and delivers lower owning and operating costs for machine owners not requiring the capabilities of the rubber-wheeled, softer track system of the MTL. Further advantages of the new small-chassis SSL models include a two-speed drive system with a top speed of 11 mph for the 226D and 232D, and for the CTLs operating weights of less than 8,000 lbs. for the 239D and 249D, allowing transport without a commercial driver's license.

The radial-lift 226D and vertical-lift 232D have standard rated operating capacities (ROC) of 1,550 and 1,850 lbs., respectively, increasing to 1,650 and 1,950 lbs. with the optional counterweight. The radial-lift 239D and vertical-lift 249D have standard ROCs of 2,050 and 2,300 lbs., which the optional counterweight increases to 2,250 and 2,500 lbs.

The 67-hp C2.2 engine uses a high-pressure/common-rail fuel system, direct fuel injection, and a maintenance-free diesel oxidation catalyst as the only required exhaust after-treatment. The new small-chassis models have 10% more horsepower, 10% more torque, and deliver a 14% increase in fuel efficiency compared with predecessor models. A demand fan is standard, ensuring optimum cooling and reduced horsepower draw.