Description
KYB C0070-23057 4722750 Control Valve Assembly Overview
The C0070-23057 4722750 Control Valve assembly manufactured by Tatan is a sectional multiple-spool hydraulic distribution unit belonging to our Main Control Valve Assembly classification. Engineered specifically for Hitachi ZX35U, ZX35U-2, ZX35U-3, and ZX35U-5A 3.5-ton mini excavators, replacing your worn valve with a Tatan complete assembly stops boom sinking, corrects travel steering deviation while grading, and restores continuous 24.5 MPa operating pressure across demanding utility trenching applications.
Powered by the machine’s main hydraulic pump and matched with the Yanmar 3TNV88 engine platform, this sectional control valve integrates micro-lapped alloy spools, load-check poppets, auxiliary thumb/breaker circuits, and a dozer blade section, ensuring 100% direct bolt-on installation with chassis hydraulic hard lines and pilot control hoses.
Key Attributes & Technical Parameters for C0070-23057 4722750 Control Valve
| Product Category | Main Control Valve Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | KYB C0070-23057 Sectional Valve | Brand Name | Tatan |
| Compatible Equipment | Hitachi ZX35U | ZX35U-2 | ZX35U-3 | ZX35U-5A | OEM Part Number | 4722750 / 4707013 / C0070-23057 |
| Matched Engine Series | Yanmar 3TNV88 / 3TNV88-XBV Diesel | Place of Origin | Guangdong, China |
| Max Relief Pressure | 24.5 MPa (245 bar / 3553 PSI) | Port Overload Pressure | 26.5 MPa (265 bar / 3843 PSI) |
| Pilot Control Pressure | 3.9 MPa (39 bar Standard Pilot Line) | Spool Precision Spec | Micro-Lapped < 0.003 mm Clearance |
| Machinery Test Report | Provided (100% Bench Pressure Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Hydraulic Fluid Spec | ISO VG 46 Anti-Wear Hydraulic Oil | Packaging | Export Wooden Box Packaging |
Supported Excavator Machinery Brands & Global Coverage
In addition to Hitachi mini excavators, Tatan manufactures and supplies replacement main control valves, hydraulic pumps, and final drives across major equipment brands:
Application Scenarios & Buyer Value
When replacing your mini excavator distribution system with our C0070-23057 4722750 Control Valve, operators and workshop mechanics secure measurable field reliability:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi ZX35U Valve Replacement | 1:1 direct bolt-on installation eliminates cylinder settling and restores simultaneous boom, arm, and swing speeds. |
| Compact Machinery Repair Workshops | Avoids the labor of disassembling valve slices and resealing tie-rods; installs as a pre-tested complete unit. |
| Landscaping & Civil Contractors | Maintains stable 24.5 MPa working pressure during continuous auxiliary breaker hammering and auger drilling. |
| Mini Excavator Fleet Stockists | High-demand 3.5-ton valve assembly ready for immediate global dispatch to minimize machine downtime. |
C0070-23057 4722750 Control Valve Diagnostic & Troubleshooting Guide
Use this technical guide to diagnose common hydraulic control valve issues on Hitachi ZX35U series mini excavators:
| Hydraulic Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Boom drops or drifts downward during neutral hold | Boom holding check valve poppet seat wear or port relief valve O-ring leakage allowing pressurized fluid to pass to tank. | Replace with Tatan 4722750 complete control valve assembly with factory pre-seated holding check poppets. |
| 2. Machine veers off course when traveling and blading together | Straight travel spool sticking or internal load check poppet seat wear causing unequal flow distribution to travel motors. | Inspect straight travel pilot pressure; install Tatan pre-calibrated replacement valve to restore balanced flow. |
| 3. Auxiliary attachment weak (breaker / auger stalls) | Auxiliary section port relief valve spring fatigue or foot-pedal pilot actuator shuttle spool contamination. | Clean pilot passages, verify 24.5 MPa relief setting, or bolt on brand-new complete control valve assembly. |
| 4. External fluid seepage between valve sections | Tie-rod bolt elongation or inter-section fluororubber O-rings degraded from continuous oil temperatures over 80°C. | Install new Tatan sectional valve pre-torqued with industrial O-rings and calibrated tie-rod fasteners. |
Transport Packaging & Certified Quality Assurance
Every Tatan control valve undergoes anti-rust oiling, port capping, plastic sealing, and solid export wooden box packaging before international shipment:
✈️ 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 mini excavator parts replenishment.
📦 Export Wooden Crates
Solid fumigated timber cases lined with thick shockproof foam to prevent transit damage.
C0070-23057 4722750 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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