Komatsu PC710-5(S/N 10001-UP)

The PC710-5 is a large-class crawler hydraulic excavator from Komatsu's early-1990s dash-5 generation, built for mining and heavy quarry production rather than general construction work. This serial range (S/N 10001-UP) runs the SA6D140-1, a turbocharged inline-six diesel of roughly 15.24 L (about 930 cu in) displacement, mechanically governed with jerk-pump injection, Komatsu's last engine generation before electronic controls. The same basic engine block also powers the PC1600-1 excavator, the WA500-1 wheel loader, and the GD825A-2 motor grader, so parts and overhaul knowledge for it circulate well beyond this one excavator. Komatsu documented the PC710-5 in one shop manual alongside the PC650-5, PC650SE-5, PC650LC-5, and PC710SE-5, but each carries its own serial range; this PC710-5 covers 10001-up, separate from the PC650-5's 20001-up range. No verified operating weight, dig geometry, or fluid-capacity figures survive in public sources for this exact model. Komatsu offered the platform across standard and SE configurations, consistent with its practice of running standard-reach and extended variants off one base machine.

Komatsu moved its large-excavator lineup to the dash-6 generation during the mid-1990s, introducing machines like the PC750-6 with electronically monitored engines and a completely different diagnostic architecture, a sharp break from the pictograph monitor and check/caution lamp system this PC710-5 uses. No factory documentation ties a direct '710'-numbered successor to this model; it appears to have been folded into Komatsu's broader reshuffle of its 700-800-plus class rather than getting a one-for-one replacement. That gap is exactly why the PC710-5 still has a place in today's used and parts market: it is a mechanically simple, ECM-free machine that shops without OEM diagnostic tools can still fully service, running an engine shared widely enough across Komatsu's contemporary large-equipment lineup that parts and rebuild expertise are easier to find than the excavator's own model-specific literature. Buyers pursuing these units now are chasing engine, injection-pump, and undercarriage condition, not options lists; with no public spec sheet surviving for weight or dig geometry, valuation runs on hour meter, oil-analysis history, and physical inspection rather than catalog numbers.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.