Description
KMX15 4281788 Main Control Valve Assembly Overview
The KMX15 4281788 Main Control Valve assembly (OEM Part Numbers: 4281788, 4192631, 4216839, KMX15) manufactured by Tatan is a heavy-duty hydraulic distribution manifold engineered specifically for the Hitachi EX120-2, EX120-3, and EX120-5 12-to-13 ton excavators. On legacy machines where internal bore wear triggers multi-circuit oil cross-leaks and boom drop, installing a brand-new KMX15 4281788 Main Control Valve unit restores precise 31.4 MPa hydraulic pressure and smooth multi-actuator responsiveness instantly.
Forged from high-density alloy iron and precision-machined with micro-lapped internal spool channels, this valve interfaces cleanly with the Isuzu 4BD1 engine output and original pilot control lines without modification.
Key Attributes & Parameters for KMX15 4281788 Main Control Valve
| Product Category | Main Control Valve Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Kayaba KMX15 Multi-Spool Valve | Brand Name | Tatan |
| Compatible Equipment | Hitachi EX120-2 | EX120-3 Excavator | OEM Part Number | 4281788 / KMX15 |
| Matched Engine Series | Isuzu 4BD1 / 4BD1T Diesel Engine | Place of Origin | Guangdong, China |
| Main Relief Setting | 31.4 MPa (314 bar / 4550 PSI) | Overload Port Relief | 34.3 MPa (343 bar / 4970 PSI) |
| Spool Bore Tolerance | Sub-Micron Lapped < 0.003 mm | Hydraulic Port Spec | JIS 30° Metric Flare Standard |
| Machinery Test Report | Provided (100% Bench Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Quality Status | 100% Brand New Complete Unit | Packaging | Export Wooden Box Packaging |
Supported Machinery Brands & Control Valve Coverage
In addition to Hitachi, Tatan manufactures replacement main control valves and hydraulic distribution manifolds for leading excavator brands:
Application Scenarios & Buyer Value
When rebuilding or replacing aging hydraulic systems with our KMX15 4281788 Main Control Valve, workshops and equipment owners eliminate repetitive downtime:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| EX120-2 Hydraulic Restoration | Stops boom/arm drift and restores crisp, multi-function simultaneous digging performance. |
| Excavator Overhaul Workshops | Avoids the high cost and unreliability of re-honing worn out 25-year-old valve bodies. |
| General Earthmoving Contractors | Provides stable flow routing for heavy trenching and backfilling without fluid overheating. |
| Export Parts Stockists | Readily available replacement valve assembly ready for immediate dispatch to international clients. |
KMX15 4281788 Main Control Valve OEM Diagnostic Guide
Use this technical diagnostic guide to identify hydraulic faults originating in the main control valve on your Hitachi EX120-2:
| Hydraulic Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Boom drops rapidly when joystick is neutral | Erosion on the boom load holding check valve poppet seat, or excessive internal clearance. | Install Tatan complete KMX15 4281788 Main Control Valve unit; flush system and replace pilot filter. |
| 2. Weak bucket and arm breakout force | Main safety relief valve setting pressure drop (<31.4 MPa) or internal spool land bypass. | Verify pump pressure; if sound, replace with Tatan pre-calibrated control valve assembly. |
| 3. Hydraulic fluid temperature spikes rapidly | High-pressure oil continuously short-circuiting across worn spool lands into tank return gallery. | Replace complete monoblock assembly to restore tight <0.003 mm tolerances and eliminate heat. |
| 4. External fluid pooling around pilot end caps | Hardened, brittle NBR pilot end-cap O-rings failing under pressure spikes. | Tatan valve comes pre-fitted with high-temp fluororubber (FKM) seals rated for heavy cycling. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan KMX15 4281788 main control valve is preserved with anti-corrosion oil, sealed in heavy poly film, and strapped inside an export-grade wooden crate.
✈️ Express Air Courier
Partnered with DHL, FedEx, UPS, and TNT for 3-7 day express door-to-door delivery worldwide.
🚢 Sea Cargo Freight
LCL and FCL ocean container shipping for heavy control valve assemblies and bulk orders.
📦 Export Wooden Cases
Fumigated solid wooden boxes with custom high-density foam inserts to prevent shipping shock.
Quality Control & International Certificates
Tatan hydraulic components are manufactured under ISO 9001 certified quality control systems and strictly comply with CE safety standards.
KMX15 4281788 Main Control Valve FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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