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Cat E2 Series mini hydraulic excavators: New cab, HDH system

Published on 17 September 2014
Cat 305.5 CR mini hydraulic excavator

The five compact radius Cat E2 Series mini hydraulic excavators – 303.5E2, 304E2, 305E2, 305.5E2 and 308E2 – will all be produced at Caterpillar’s new 850,000 square foot facility in Athens, Georgia, and will also use the new high definition hydraulic (HDH) system.

The new HDH system in these machines provides a load sensing and flow sharing capability leading to operational precision, efficient performance and greater controllability. The simple valve architecture reduces heat, which leads to a reduction in hydraulic instability and improved overall efficiency.

The 305.5E2, 305E2, 304E2 and 303.5E2 all include a redesigned operator station. This update includes a wider opening, a high quality suspension seat, easy-to-adjust armrests and an enhanced ergonomic layout for operator comfort and productivity. Additionally, a new interlocking front window system, updated operator interface controls and 100 percent pilot controls provide a best-in-class operator station.

Smart Technology is a new feature of the 303.5E2. Through the integration of this technology with the Tier 4 compliant 23.5-hp (17.6-kW) engine, the machine is able to meet and exceed performance of the 303.5E. Test results show an 8 percent fuel consumption improvement and 7 percent greater efficiency over the E series.

Cat 305.5E2 CR mini hydraulic excavator

All the E2 series models are equipped with the digital control panel specially designed for the company’s mini excavators – COMPASS – complete operation, maintenance, performance and security system.

Built into the COMPASS monitor are an anti-theft system (which requires a five-digit alphanumeric password to start the machine), automatic engine-idle selection (which drops engine rpm to idle after four seconds of inactivity) and an adjustable auxiliary-flow control for work tools. Both main and optional secondary auxiliary-hydraulic systems can be adjusted on a scale of one to 15 through the monitor for added control.

The blade float function allows the operator to drag the blade backwards (away from the cutting edge side), and the blade will “float” along the contour of the ground with only the weight of the blade bearing down to smooth the site after grading and backfilling holes.

Finally, all the company’s mini hydraulic excavators from 3.5 metric tons to 8 metric tons are ROPS, TOPS and Top Guard Level 1 certified. The machines also include the Cat interlock (hydraulic lockout) system, a certified accumulator that allows auxiliary pressure to be released to make connecting and disconnecting work tools safer and easier, and a travel alarm. All of these safety features are standard on the E2 model lineup.  FG

—From Caterpillar news release

The Cat 305.5E2 CR mini hydraulic excavator working in the woods. Photos provided by Caterpillar.