Kubota KX057-4 U55-4 Excavator Service Manual

Kubota Australia's own confirmed product copy frames the KX057-4's genuine positioning directly: "with a strong breakout force and exceptional power, the Kubota KX057-4 compact excavator with a deluxe cab puts you in luxury and on top of almost any challenge... redefining the 5.5 tonne class, the KX057-4 offers the ultimate in performance and luxury in comfort." Boom & Bucket's own confirmed account describes the machine's genuine everyday versatility: "capable of handling a variety of tasks, from digging trenches to moving large amounts of dirt," extending to demolition work through concrete and hard surfaces as well as agricultural tilling.

Power comes from a Kubota V2607-CR-E4 water-cooled, four-cycle, four-cylinder diesel, delivering a claimed 47.6 hp (SAE gross) at a 2,200 rpm rated speed, with a 1,100 rpm low idle. The scanned factory service manual's own confirmed spec table lists genuine model-specific figures worth knowing before ordering parts: operating weight (including operator) ranges from 5,405 kg (11,915 lbs) on the canopy-and-blade U55-4 up to 5,685 kg (12,535 lbs) on the cab-equipped, blade-fitted version, with a 9.3 rpm swing speed, a fast travel speed of 4.9 km/h (3.04 mph), and a slow speed of 2.8 km/h (1.74 mph).

The genuine distinction between the two model names in your listing comes down to swing geometry: the KX057-4 runs conventional swing (the counterweight and upper structure can overhang the tracks during rotation), while the U55-4 uses a reduced tail-swing design keeping the rear end tucked closer to the tracks — genuinely important when working in confined spaces or close to structures. LECTURA Specs' own confirmed dimensions for the KX057-4 configuration list a 3.89-metre dredging depth, 6.26-metre maximum horizontal reach, a 42.3 kN tear-out force, and a 0.17 cubic-metre bucket capacity on a 400mm track width.

A single official operating-instructions manual genuinely groups the KX057-4, U48-4, and U55-4 together, confirming Kubota's own view that these models share enough fundamental architecture to be documented as one family — the manual's own introduction confirms "the data in the operating instructions apply for all models." This exact 2009-onward configuration ran until Kubota's KX057-5/U55-5 replaced it with a 7-inch LCD screen, optional keyless start, and a redesigned cabin.

This factory service manual covers the procedures, torque specs, and diagrams needed to keep a Kubota KX057-4/U55-4 excavator running the way it was built to.