CAT, excavator, D series--New Cat D Series excavators revealed

The new mini excavators from Cat feature more performance, quality and reliability than their predecessors

The new Cat D Series mini hydraulic excavator range includes models 303.5D CR, 304D CR, 305D CR and 305.5D CR with operating weights 3.5 to 5.5 tonne.

Cat says they are powerful, versatile, compact-radius machines that work comfortably in confined spaces and build on the quality design and reliability of their C Series predecessors.

The new machines feature enhanced stability, a redesigned work-tool coupler, load-sensing hydraulics, and engines that meet US EPA Tier-4 Interim and EU Stage-3A emissions regulations.

Models 303.5D CR and 304D CR are zero-tail-swing machines; models 305D CR and 305.5D CR are compact-radius machines that limit upper-body tail swing over the tracks to 5.5 inches (140mm) or less.

Increased-width undercarriages for the 303.5D CR and 304D CR and heavier counterweights for the 305D CR and 305.5D CR 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.

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 load-sensing system resulting in low-effort pilot controls. In addition, refined main valves for the 305D CR and 305.5D CR further enhance hydraulic controllability.

D-Series models are available with a two-post canopy operator's station, or with an optional enclosed cab. The sealed cab provides features such as a heater/defroster/ventilation system, sliding-door system, retractable front window (with gas-strut assist), removable lower-front window, sliding side window and a radio-ready package.

The boom-swing function is now incorporated into the joystick controllers, and auxiliary-hydraulic controls also are positioned in the joysticks. An in-cab control allows switching the joysticks between an excavator and backhoe-type control pattern.

An automatic two-speed-travel feature shifts the drive system to meet changing torque and speed requirements, and a low-speed switch keeps the drive system in low range for precise-grading operations if desired. An automatic engine-idle feature reduces engine speed when hydraulic functions are inactive for four seconds, saving fuel and reducing sound levels and emissions.

Source: Deals on Wheels