Komatsu PC30-7 Excavator Complete Diesel Engine Assembly

Tatan Machinery supplies professionally remanufactured Komatsu 3D84E diesel engine assemblies (OEM part reference: YM129100-01330 / 129100-01330) engineered for Komatsu PC30-7, PC35R-7, and related 3-ton compact excavators. Built on the field-proven Yanmar 3TNE84 industrial block, this 1.5L 3-cylinder mechanical power plant is completely remanufactured strictly to OEM micrometer tolerances with 100% brand-new internal wear components. This page details extended machine model compatibility, technical powertrain parameters, trenching diagnostic failure criteria, and real-world buyer sourcing answers for plant hire fleets and civil engineering workshops.

Compatible Equipment Matrix (Machine Fitment)

The Komatsu 3D84E (Yanmar 3TNE84 base) powers a wide variety of Komatsu compact excavators and compact wheel loaders. Please check your machine model below:

* Note: Mounting bellhousings, oil pan depths, and throttle linkages may differ between wheel loaders and excavators. Gavin cross-references your exact machine PIN before dispatch.

Supplier Information & Build Status

Remanufacturing Standard: What Makes This Drop-In Ready?

A 3-ton excavator requires reliable engine torque under continuous digging and tracking. We do NOT sell worn salvage yard pulls. Every 3D84E engine is completely stripped and rebuilt with 100% brand-new internal wear parts:

• Block & Head Core Verification: Cylinder block and head undergo chemical carbon stripping, ultrasonic cleaning, and pressure hold tests. Fire deck precision milled flat.
• 100% Brand-New Wear Components Installed: Brand-new 84mm pistons, complete piston ring sets, cylinder liner sleeves, connecting rod bushings, main bearings, rod bearings, and thrust washers.
• Precision Crankshaft Re-Machining: Forged crankshaft journals micropolished and dynamically balanced to factory runout specifications.
• 100% Brand-New Gasket & Seal Pack: Premium cylinder head gasket, front timing cover seal, and rear crankshaft main seal replaced to prevent oil weeping into the bellhousing.
• Mechanical Injection Pump Calibration: Mechanical fuel injection pump elements inspected, recalibrated on a bench, and fuel injectors fitted with new nozzles for clean atomization.

When to Replace the 3D84E Engine on Komatsu PC30-7: Field Diagnostics

The Komatsu PC30-7 is a high-cycle utility machine frequently used with hydraulic breakers or augers. When major mechanical failure occurs, replacement is the fastest path back to revenue:

• Engine Lug-Down & Stall Under Hydraulic Relief: Worn injection pump plungers losing fuel delivery pressure when the hydraulic system demands peak flow, causing severe engine hesitation or stall during trench breakout.
• Cooling Fin Clogging & Blown Cylinder Head Gasket: Fine excavation mud and chaff pack tightly into the radiator. Chronic overheating warps the cylinder head and allows combustion gas into the coolant expansion tank.
• Crankshaft Journal Scoring & Rod Knock: Working on steep foundation trenches with low oil capacity (~4.0L) causes oil pickup starvation on side angles, spinning rod bearings and gouging the crankshaft.
• Excessive Breather Smoke & Compression Loss: Piston ring wear allowing combustion blow-by into the oil pan, causing oil to push out of the dipstick tube and hard cold-starting.

Workshop Testing Standards (Pre-Delivery Inspection)

Every remanufactured Komatsu 3D84E engine undergoes 5-step quality verification before packaging:

1. Manual Crankshaft 720° Barring Test: Smooth rotation verification without valvetrain binding or mechanical interference.
2. Mechanical Fuel Pump Timing & Plunger Check: Verification of fuel spill timing and injection nozzle atomization pattern.
3. Lube Oil Gallery Pressure Priming: Pre-filling the oil circuit to confirm pressurized flow through main journals and valvetrain.
4. Block & Head Pneumatic Leak Hold Test: Air hold test to guarantee cylinder head gasket and water jacket sealing integrity.
5. Flywheel Coupler Concentricity Dial Check: Ensuring 100% true alignment for the hydraulic main pump drive coupling.

Export Heavy-Duty Packaging Process

Although compact, the 3D84E is packed to full industrial export standards to survive rough ocean and air cargo transit:

• Internal & External Anti-Rust Preservation: All raw machined surfaces, crankshaft snout, and flywheel teeth coated with high-grade anti-corrosion grease.
• Dust Caps on All Openings: Intake manifold, exhaust elbow, water inlets, and fuel feed fittings sealed with heavy-duty protective plugs.
• Direct Sump-Skid Bolting: The engine is anchored securely to heavy timber base skids through rigid mounting brackets.
• ISPM 15 Fumigation-Free Solid Crate: High-density export plywood crate secured with galvanized steel strapping.

Actual export wooden crate packaging and internal skid bracing for 3D84E

Global Shipping & Customs Documentation

Fast, reliable dispatch tailored for commercial contractors and parts wholesalers worldwide:

• Emergency Machine Down (AOG Freight): Priority air cargo via DHL Aviation, FedEx Heavy Cargo, or direct airline belly freight within 3–7 business days.
• Ocean Container Freight (LCL / FCL): Consolidated container shipping to all major commercial seaports worldwide.
• Complete Export Documents: Commercial Invoices with correct HS Code (8408.20), Packing Lists, and Certificates of Origin for smooth customs clearance.

Container loading and air freight dispatch supported by global logistics partners

Critical Installation Guidelines (PC30-7 Mechanic Checklist)

To prevent premature wear or failure of your newly installed engine, technicians MUST adhere to these procedures:

1. Complete Cooling System Flush: Remove the aluminum radiator and pressure-wash the external cooling fins. If the old engine experienced blown head gaskets, flush the internal cooling circuit to prevent oil emulsion deposits from insulating the heat exchanger.
2. Hydraulic Main Pump Spline Alignment: The PC30-7 couples directly to the main variable-displacement hydraulic pump. Inspect the rubber dampener coupling element for cracks. Guide the pump in by hand; never draw it flush using flange bolts!
3. Mechanical Fuel System Bleeding: Bleed low-pressure air at the fuel-water separator hand primer, then loosen the injection line flare nuts at the cylinder head while cranking until solid fuel pulses emerge. Tighten and start.
4. Engine Stop Solenoid Travel Check: Verify that the 12V fuel shutoff solenoid operates freely. If the solenoid plunger binds against the linkage, the engine will either fail to start or fail to shut off.
5. Initial Oil Fill & Filter Priming: Pre-fill the new spin-on oil filter with 15W-40 oil. Disconnect the stop solenoid wire and crank the starter motor in 10-second intervals until the instrument cluster oil pressure lamp extinguishes.

Buyer Frequently Asked Questions (Purchasing FAQ)

Q: What components are included with this complete 3D84E engine assembly? Is it plug-and-play?

A: Our assembly is delivered as a complete, ready-to-run drop-in engine. It includes the cylinder block, cylinder head, valvetrain, crankshaft, pistons, in-line mechanical fuel injection pump, fuel injectors, water pump, oil filter housing, oil pan, and intake/exhaust manifolds. Starter motors, alternators, and cooling fans can be pre-fitted based on your machine’s exact voltage and harness configuration.

Q: How does your remanufactured 3D84E compare to a used salvage yard pull?

A: We do NOT sell junkyard pulls with unknown operating hours. This engine is completely stripped to bare cast iron, crack-tested, and precision re-machined. 100% of internal wear parts are replaced with brand-new parts (new 84mm pistons, piston rings, cylinder liners, rod/main bearings, and a complete gasket kit). The mechanical fuel pump is flow-tested on a calibration bench. It provides OEM-level compression and service life at a fraction of dealer pricing.

Q: Are your hydraulic pumps and other PC30-7 replacement components remanufactured too?

A: No. Only our diesel engine assemblies are professionally remanufactured. All other Komatsu PC30-7 replacement parts—including our main hydraulic pumps, main control valves, final drive travel motors, and rubber tracks—are 100% Brand New (OEM-Grade Aftermarket) ready for immediate jobsite installation.

Q: Will this engine fit my Komatsu PC35-7 or PC30MR-1 without modification? How do we verify?

A: While the core 3D84E engine block is identical across these models, differences can exist in flywheel housing pilot holes, throttle stop solenoid brackets, or oil pan sumps. Simply send your machine’s serial number plate and photos of your old engine’s pump mounting face to Gavin. We cross-verify the exact parts arrangement in the official Komatsu parts system within 10 minutes.

Q: Can I see live video testing and stamped block numbers of my specific engine before dispatch?

A: Absolutely yes. Transparency is our core standard. Prior to balance payment and crating, we supply clear photos and live video of the specific unit assigned to your order. You will see the stamped serial numbers, mechanical injection pump tags, flywheel teeth, and the complete wooden box packaging process.

Q: How is the engine protected during sea freight, and what customs documentation is provided?

A: Every shipment from Tatan Machinery is protected by full commercial marine cargo insurance. The engine is bolted down directly onto internal skids within a fumigation-free solid plywood crate. We supply commercial invoices with accurate HS Codes (8408.20), detailed packing lists, and Certificates of Origin for smooth customs clearance at your destination port.

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🔗 Frequently Purchased Together with Komatsu PC30-7 Diesel Engine:

• MAIN VALVE:
  Main Control Valve Assembly for Komatsu PC30-7 Excavator
  100% Brand New
• HYDRAULIC PUMP:
  Main Hydraulic Pump Assembly for Komatsu PC30-7
  100% Brand New
• TRAVEL MOTOR:
  Final Drive Travel Motor Assembly for Komatsu PC30-7
  100% Brand New
• BRAND CATALOG:
  View All Komatsu Excavator & Heavy Equipment Parts Collection

Get Wholesale Factory Quote for 3D84E YM729005-01560 Engine

Looking for direct factory pricing, stock availability, or technical verification for Komatsu 3D84E engines? Contact senior specialist Gavin now!

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✉️ Email Gavin: [email protected]

💡 Fast Quote: Send your engine serial number or nameplate photos for an accurate match within 10 minutes!

* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote based on freight destination and configuration.