Yanmar 4TNV98-EPHYBU engine for Doosan DX55 mini excavator
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The 4TNV98 series is part of Yanmar’s "Total New Value" line, designed to meet modern emission standards while maximizing fuel efficiency.
Type: 4-Cycle, Vertical, Water-cooled Diesel
Number of Cylinders: 4
Displacement: 3.319 Liters
Rated Output: Approximately 36.2 - 39.5 kW @ 2200-2400 RPM
Aspiration: Naturally Aspirated
Combustion System: Direct Injection
Emission Compliance: Tier 3 / Stage IIIA Equivalent
2. Compatibility: Doosan DX55 Application
The "EPHYBU" suffix indicates the specific configuration tailored for Doosan (now Develon) machinery.
Mounting: Features a specific flywheel and housing configuration to mate perfectly with the Doosan DX55’s hydraulic pump drive.
Cooling: Optimized fan and water pump placement designed for the compact engine compartment of a 5.5-ton mini excavator.
Governor: Equipped with a governor system tuned specifically for the DX55's Load Sensing hydraulic system to ensure smooth power delivery.
3. Key Features for Excavator Operators
High Torque Rise: This engine is designed to prevent stalling when the excavator encounters tough soil conditions, maintaining constant power to the hydraulic pumps.
Low Noise and Vibration: Yanmar utilizes a ladder frame structure and a sophisticated fuel injection timing system to reduce engine noise and vibration, increasing operator comfort.
Cold Start Capability: Includes a high-capacity starting motor and glow plugs for reliable ignition in cold climates.
4. Maintenance and Service Protocol
To ensure the longevity of the 4TNV98 in your Doosan DX55, follow these critical service guidelines:
Engine Oil: Change every 250 to 500 hours using high-quality 15W-40 or 10W-30 oil depending on the ambient temperature.
Fuel System: The Direct Injection system is highly sensitive to water. Always drain the water separator daily and replace fuel filters every 500 hours.
Valve Clearance: Inspect and adjust every 1,000 hours to maintain optimal fuel efficiency and prevent power loss.
Cooling System: Use a 50/50 Long Life Coolant (LLC) mix to prevent internal corrosion of the cylinder liners and water jacket.
5. Professional Support and Logistics
Replacing or repairing an engine for a Doosan DX55 is a significant investment. We provide:
Genuine Yanmar Parts: We offer original Yanmar components including pistons, rings, liners, and gaskets to ensure the engine meets its original factory life expectancy.
Complete Engine Assemblies: Available in brand-new original or professional remanufactured options, fully bench-tested before shipping.
Technical Support: Our team provides torque specifications, wiring diagrams, and troubleshooting for complex Yanmar engine issues.
Rapid Shipping: Engines are secured in heavy-duty, export-grade wooden crates and shipped via global freight to minimize machine downtime.
6. Ordering Information
To ensure 100% fitment for your Doosan DX55, please provide:
The Engine Serial Number (found on the valve cover sticker or the engine block).
The Machine Serial Number (found on the Doosan chassis plate).
Photos of the engine's nameplate and the side where the hydraulic pump mounts.