Caterpillar D Series Mini Excavators Add More Performance and Operator Convenience

The Caterpillar home page features the new Cat D Series Mini Hydraulic Excavators — models 303.5D CR, 304D CR, 305D CR and 305.5D CR.

Photo Credit: Caterpillar

According to Caterpillar, with model designations that closely reflect their operating weights (3.5 to 5.5 metric tons), the new machines feature enhanced stability for greater productivity, a redesigned work-tool coupler, load-sensing hydraulics, and engines that meet U.S. EPA Tier-4 Interim and E.U. Stage-3A emissions regulations.

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.

Photo Credit: Caterpillar

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 for operator comfort.

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.

Photo Credit: Caterpillar

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. The implement hydraulic system is a responsive, load-sensing system resulting in low-effort pilot controls for optimum control and fast cycle times. In addition, refined main valves for the 305D CR and 305.5D CR further enhance hydraulic controllability.

Photo Credit: Caterpillar

D-Series models are available with a two-post canopy operator’s station, or with an optional enclosed cab that can be equipped with available air conditioning. The sealed cab provides premium standard features such as an efficient heater/defroster/ventilation system, sliding-door system for confined-area access, retractable front window (with gas-strut assist), removable lower-front window, sliding side window and a radio-ready package.

Source: Caterpillar

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