Mitsubishi 6D34 Diesel Engine Assembly | 7.5L 6-Cylinder Turbo Engine Compatible with Kobelco SK200-6 Kato HD820 Excavators

We supply complete, heavy-duty Mitsubishi 6D34 and 6D34-T diesel engine assemblies as well as precision engine overhaul parts. The 7.5L 6-cylinder turbocharged direct-injection diesel engine is direct-fit compatible with Mitsubishi 6D34 engine configurations widely operating in 20 to 25-ton hydraulic excavators, including Kobelco SK200-5 / SK200-6 / SK200-6E / SK230-6 / SK250-6, Kato HD820 / HD820-3 / HD1023, and Hyundai R210LC-3 / R220LC-3. Built to heavy-duty aftermarket specifications, our 6D34 engines deliver smooth low-RPM torque, high mechanical reliability, and long service life under heavy digging loads.

• Medium & Heavy Excavation: Primary power source for 20-25 ton excavators performing mass earthmoving, trenching, and civil infrastructure construction.
• Demolition & Quarrying Projects: Maintains steady flywheel RPM during sudden hydraulic shock loads from heavy breaker hammers and crushing shears.
• Mining & Aggregates Site Operations: High thermal capacity oil cooler and rigid iron cylinder block withstand dust and continuous 24/7 shifts.
• Remote Utility Fleets: High-reliability mechanical injection pump operates dependably even with variable fuel quality in remote fields.

To assist site technicians and machinery repair shops in diagnosing performance issues, below is a diagnostic reference for common Mitsubishi 6D34 engine failures:

• Engine Overheating & Coolant Pressure Surge: Commonly caused by blown cylinder head gaskets, water pump impeller cavitation, clogged oil cooler cores, or stuck thermostats during intense summer digging shifts.
• Excessive Black, White, or Blue Exhaust Smoke: Black smoke signals fuel injection pump timing errors or insufficient air boost from a worn turbocharger (TE06H). White smoke indicates cold misfires or coolant entering combustion chambers. Blue smoke points to oil burning past worn piston rings or valve stem seals.
• Hard Starting, Low Fuel Pressure & Engine Power Drops: Linked to fuel lift pump diaphragm wear, air leaks in fuel lines, stuck mechanical injection pump plungers, or clogged fuel filters.
• High Crankcase Blow-by & Excessive Oil Consumption: Caused by scuffed 6D34 cylinder liners, stuck piston compression rings, or worn valve guides after extended operating hours.
• Engine Knocking & High Idle Vibration: Triggered by uneven cylinder compression, faulty injector nozzles, or worn main crankshaft bearings.

A: Yes. The Mitsubishi 6D34 diesel engine assembly is precision-manufactured to standard OEM dimensional specs. SAE flywheel housing bolt patterns, starter motor positioning, engine mounting brackets, and radiator hose ports are direct-fit compatible with Kobelco SK200-5 / SK200-6, SK230-6, and Kato HD820 excavators.

A: The Mitsubishi 6D34 is a 7.545L (7.5L), 6-cylinder in-line, 4-stroke, water-cooled direct-injection diesel engine. Turbocharged (6D34-T) variants produce output ranging from 110 kW to 135 kW (150–180 HP) at 2150 RPM.

A: Buying a complete, pre-tested engine assembly avoids extended machine downtime, eliminates hidden costs from cracked cylinder blocks or worn crankshafts, and ensures immediate, reliable operation upon bolt-on installation.