Yanmar 4TNV88-N excavator engine for Hitachi ZX48U ZX50U ZX55U excavator
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1. Application Compatibility
This engine is the core power plant for Hitachi’s mid-range mini excavators:
Hitachi Zaxis Series: ZX48U, ZX48U-2, ZX48U-3, ZX48U-5
Hitachi Zaxis Series: ZX50U, ZX50U-2, ZX50U-3, ZX50U-5
Hitachi Zaxis Series: ZX55U, ZX55U-5
Other Equipment: Widely used in John Deere (50G, 60G), Kobelco (SK45SR, SK50SR), and various air compressors or high-capacity forklifts.
2. Technical Specifications
Engine Model: Yanmar 4TNV88-NHZ / 4TNV88-BX
Type: 4-Cylinder, 4-Cycle, Liquid-Cooled Diesel
Aspiration: Naturally Aspirated
Bore x Stroke: 88 mm x 90 mm
Displacement: 2.189 Liters
Rated Output: 28.0 - 30.0 kW (Approx. 37 - 41 HP @ 2400 RPM)
Emission Class: EPA Tier 4 / EU Stage V (depending on production year)
Combustion System: Direct Injection (DI)
Lubrication: Forced lubrication with trochoid pump
3. Key Engineering Advantages
Optimized for "U" Series: The 4TNV88 features a compact cooling jacket and specialized manifold design to fit the zero-tail-swing (Short Radius) housing of the ZX48 and ZX55 without sacrificing airflow.
Direct Injection Efficiency: Delivers superior fuel atomization, which results in higher torque for lifting heavy pipe or trenching through compacted soil while maintaining low fuel consumption.
Low Noise & Vibration: Utilizes a ladder-frame structure and specialized gear tooth profiles to reduce mechanical noise, making it suitable for quiet-zone or night-time residential construction.
High Durability: Features a robust gear-driven valvetrain and high-strength alloy cylinder block designed for 10,000+ hour service intervals in professional construction environments.
4. Supply Scope for Parts
Engine Assemblies: Brand new original Yanmar units, factory remanufactured engines, and tested used units.
Overhaul Kits: Pistons, piston rings, cylinder liners, and main/connecting rod bearings.
Gasket Sets: Complete engine overhaul gasket kits, including the premium MLS head gasket.
Fuel & Cooling: Injection pumps, fuel injectors, water pumps, thermostats, and oil coolers.
Electrical: 12V Starters, alternators, and engine shut-off solenoids.
Service Support: 1-year quality warranty on new components and fast global shipping (DHL, UPS, FedEx).