Description
4TNV88 129900-00100 Engine Assembly Overview
The 4TNV88 129900-00100 Engine assembly manufactured by Tatan is a heavy-duty, liquid-cooled 4-cylinder in-line industrial diesel powerplant belonging to our Diesel Engine Assembly classification. Engineered specifically for Hitachi ZX55, ZX55U, ZX55U-5A, and ZX50U compact excavators, replacing your worn or blown core with a Tatan complete turnkey assembly stops crankcase oil spitting, restores 29.8 kW (40.0 HP) rated output at 2400 RPM, and cures hot-idle oil pressure loss under continuous hydraulic pump load.
Coupled directly to the machine’s main hydraulic pump and governing the main control valve assembly, this complete diesel engine incorporates an induction-hardened forged steel crankshaft, a crossflow cylinder head, an internal trochoid gear oil pump, and an in-line mechanical MP4 fuel injection pump, ensuring 100% direct bolt-on installation with flywheel housings and chassis mounts.
Key Attributes & Technical Parameters for 4TNV88 129900-00100 Engine
| Product Category | Diesel Engine Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Yanmar 4TNV88 / 4TNV88-BND Diesel | Brand Name | Tatan |
| Compatible Equipment | Hitachi ZX55 | ZX55U | ZX55U-5A | ZX50U | OEM Part Number | 129900-00100 / YA00000459 |
| Matched Engine Series | Yanmar 4TNV88 Series (4-Cylinder) | Place of Origin | Guangdong, China |
| Max Relief Pressure | 28.3 kW – 29.8 kW @ 2400 RPM Rated | Pilot Control Pressure | 2.189 Liters (88mm × 90mm) |
| Spool Precision Spec | Micro-Honed STD 88mm Bore < 0.003 mm | Quality Status | 100% Brand New Turnkey Assembly |
| Machinery Test Report | Provided (100% Dyno Bench Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Hydraulic Fluid Spec | 15W-40 Heavy-Duty Diesel Engine Oil | Packaging | Export Wooden Box Packaging |
Multi-Machinery Fleet Support & Engine Assembly Inventory
Tatan supplies factory-built turnkey diesel engines, cooling assemblies, water pumps, and internal overhaul kits for excavators, wheel loaders, and compaction rollers globally:
Supported Excavator Machinery Brands & Global Coverage
In addition to Hitachi compact excavators, Tatan manufactures and supplies replacement complete diesel engines, short blocks, and overhaul parts across major equipment brands:
Application Scenarios & Buyer Value
When replacing your 5.5-ton excavator power unit with our 4TNV88 129900-00100 Engine, workshop mechanics and fleet managers secure direct operational uptime:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi ZX55 Engine Repowering | 1:1 direct bolt-on installation eliminates starting delays and restores full 29.8 kW power for simultaneous digging and blading. |
| Compact Machinery Repair Workshops | Avoids the complex labor of block re-boring and injector pump calibration; installs as a pre-timed turnkey unit. |
| Urban Utility & Earthmoving Fleets | Heavy-duty forged pistons and multi-layer steel head gaskets withstand continuous hydraulic breaker hammer operations. |
| Equipment Parts Stockists | High-demand 4-cylinder engine inventory packaged in solid export wooden crates ready for immediate global dispatch. |
4TNV88 129900-00100 Engine OEM Diagnostic & Troubleshooting Guide
Use this technical guide to troubleshoot Yanmar 4TNV88 diesel engine symptoms on your Hitachi ZX55 compact excavator:
| Engine Fault Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Hard cold starting with heavy white smoke | Worn mechanical MP4 injection pump plungers dropping fuel pressure, or faulty glow plugs causing unburned fuel vapor. | Replace with Tatan 129900-00100 complete engine fitted with brand-new calibrated in-line injection pump and pre-tested glow plugs. |
| 2. Coolant boiling & expansion tank bubbling | Combustion gas blown past cylinder head gasket between rear cylinders 3 and 4 due to localized thermal distortion under heavy blading. | Install Tatan new engine with factory-torqued MLS head gasket and precision surface-milled parent block face. |
| 3. Heavy crankcase blow-by & oil spitting | 88mm cylinder wall micro-scoring or stuck top compression rings allowing combustion pressure into the oil pan. | Install Tatan new 4TNV88 turnkey engine; flush radiator cooling fins and install fresh dual-element air filters. |
| 4. Oil pressure lamp flickers at hot idle (< 0.10 MPa) | Excessive crankshaft main journal bearing clearance or worn trochoid oil pump rotor losing delivery volume. | Replace complete engine assembly to maintain factory oil pressure (> 0.38 MPa rated / > 0.15 MPa idle) and prevent crankshaft seizure. |
Transport Packaging & Certified Quality Assurance
Every Tatan diesel engine undergoes internal anti-corrosion fogging, heat-sealed plastic wrap, and solid timber export crating:
✈️ Express Air Courier
Partnered with DHL, FedEx, and UPS for 3-7 day priority delivery worldwide.
🚢 Sea Cargo Freight
LCL and FCL container ocean freight for bulk equipment parts replenishment.
📦 Export Wooden Crates
Solid fumigated timber cases lined with thick shockproof foam to prevent transit damage.
4TNV88 129900-00100 Engine FAQ & Related Categories
🔗 Frequently Purchased Together with ZX55 Engine:
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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