What kind of work is the 306 CR best at?

Trenching, grading, utility work and general digging on tight sites. The reduced tail swing lets it work alongside walls, fences and traffic without swinging the counterweight out.

How does it compare with a 3- to 5-ton mini excavator?

It digs deeper and lifts more, and the wider stance is more stable on slopes. The trade-off is a heavier machine that needs a bigger trailer and tow vehicle.

Does the reduced tail swing limit lifting?

Yes, somewhat. The counterweight stays within the tracks, so lift capacity over the rear at full reach is lower than a conventional-swing excavator of the same weight.

What engine does it use?

A Cat C2.4 turbo diesel. It meets current emissions standards with diesel exhaust aftertreatment, which adds filter and fluid maintenance.

What should I check on a used unit?

Track and undercarriage wear, hydraulic hose condition, hours on the machine, and service records for the engine and aftertreatment. Confirm the coupler and any attachments included.