Versatile mini hydraulic excavators

Caterpillar Inc.

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Caterpillar’s new D Series mini hydraulic excavators are powerful, versatile, compact-radius machines. Models 303.5D CR and 304D CR are zero-tail-swing machines that keep the radius of the upper body within the width of the tracks; models 305D CR and 305.5D CR are compact-radius machines that limit upper-body tail swing over the tracks to 5.5 inches (140 mm) or less. Both designs reduce the machine's operating footprint and simplify the operator's job. Increased-width undercarriages for the 303.5D CR and 304D CR and heavier counterweights for the 305D CR and 305.5D CR significantly enhance machine stability, allowing increased lift capacity, more effective use of reach and digging forces, increased capability when handling heavy work tools and improved machine balance.

A new pin-grabber-type coupler (with the new optional hydraulic operation) combines positive work-tool retention with a design that maintains tight tolerances between coupler and tool, significantly reducing wear. A standard-equipment two-mode auxiliary-hydraulic system, complete with lines and quick connectors, can be switched between single-direction and bi-directional operation for effectively using work tools ranging from hydraulic breakers to augers.