The Redesigned Engine in Bobcat R-Series Loaders

The T66, S66, T76 and S76 from the redesigned Bobcat R-Series are available at the Bobcat dealership and incorporate significant changes to the engine and powertrain.

Courtesy of Bobcat

The benefits of the new Bobcat R-Series engine

The new Bobcat engine is completely redesigned to deliver more performance and capability. The R-Series 60 and 70 frame size models offer a redesigned Tier 4 non-DPF Bobcat inline engine and direct drive system. This generates more torque across a much wider rpm range than other engines, maximising performance and completing jobs faster.

Reorienting the engine of Bobcat R-Series loaders simplifies the design and helps keep you on the job and out of the shop. The incline engine now runs from the front to the back of the machine with the hydrostatic and hydraulic pumps connected in-line with the engine. Bobcat also replaced the drive belt and the tensioning system with a direct-drive system, so you can operate knowing your engine is up for the job.

The fuel tank position change

In the design of other Bobcat skid-steer and track loader series, the fuel tank sits just above the engine. When the R-Series engine was repositioned, Bobcat had the ability to reorient the fuel tank to the side of the engine as a result. The vertical fuel tank and new fuel module on the Bobcat engine allow you to capture more usable fuel from every tankful. This not only extends your productivity per tank; it improves your ability to work on slopes when the tank gets low.

The new fuel system improves Bobcat R-Series performance

If you’re used to working in colder conditions, the R-Series fuel system will not only improve your loader’s reliability and ease of maintenance but will improve cold weather operation. These improvements are made possible by a much larger fuel filter, a dedicated lift pump and better circuitry. The new fuel filter also includes a sensor, clear water bowl and drain for easy operator monitoring.

The enhanced cooling system

In order to maximise uptime in R-Series loaders, Bobcat incorporated a much larger fan and a larger, higher-capacity radiator and oil cooler. These features, combined with the inline engine layout and louvered tailgate, provide the airflow your machine needs for optimal operation. It lowers the engine compartment temperature of the loader by 80 degrees and creates less noise than previous models. The new cooling system works by pulling in air from the rear tailgate and releasing it from the top of the cooling stack, allowing you to work long hours with a powerful engine you can count on.

The crankcase division of the Bobcat R Series loader

When the engine was moved, Bobcat had to consider how it would interact with the rest of the machine. In order to avoid any internal collisions with the engine, Bobcat split the centre chaincase in two parts and moved them to the outside of the machine. Bobcat also further strengthened our maintenance-free chaincase by adding steel castings to support the axel tubes.

Source: Bobcat'
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