Description
KMX15N 309-5711 Main Control Valve Assembly Overview
The KMX15N 309-5711 Main Control Valve Assembly manufactured by Tatan is a high-pressure multi-spool hydraulic directional control block belonging to our Main Control Valve Assembly classification. Built in accordance with ISO fluid power standards, installing this complete KMX15N 309-5711 Main Control Valve Assembly unit eliminates hydraulic cylinder drifting, sluggish boom hoist response, and compound movement flow interference on Caterpillar 323D, 323D L, and 323D LN 23-ton excavators.
Constructed from high-tensile alloy cast iron, this assembly houses precision-ground spools with tight 0.007 mm clearances to minimize internal bypass. Pre-installed with pilot-operated pressure relief valves, load-holding checks, and boom drift reduction valves, it ensures exact flow matching between your dual hydraulic main pumps and heavy work equipment cylinders.
Key Attributes & Parameters for KMX15N 309-5711 Main Control Valve Assembly
| Product Category | Main Control Valve Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | KMX15N / KMX15RA Directional Control Valve | Brand Name | Tatan |
| Compatible Equipment | Caterpillar 323D | 323D L Excavator | OEM Part Number | 309-5711 / 309-5710 / 279-7868 |
| Main Relief Pressure | 35.0 MPa (350 Bar / 5076 PSI) | Power Boost Pressure | 38.0 MPa (380 Bar / 5511 PSI) |
| Spool Bore Tolerance | 0.006 – 0.008 mm Precision Ground | Integrated Circuits | Boom Drift Reduction & Stick Regeneration |
| Machinery Test Report | Provided (Bench Pressure Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Body Material | High-Tensile Alloy Cast Iron Block | Place of Origin | Guangdong, China |
| Quality Status | Brand New Control Valve Unit | Packaging | Export Wooden Box Packaging |
Supported Machinery Brands & Hydraulic Valve Coverage
In addition to Caterpillar, Tatan manufactures replacement complete main control valves, hydraulic distributors, and valve cartridges for leading machinery brands:
Application Scenarios & Buyer Value
When resolving hydraulic control and distribution failures with our KMX15N 309-5711 Main Control Valve Assembly, workshops and equipment owners gain immediate benefits:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| CAT 323D Valve Bank Replacement | Swapping to a complete KMX15N 309-5711 Main Control Valve Assembly eliminates repetitive machine downtime caused by internal spool scoring and body casting wear under 23-ton digging forces. |
| Hydraulic Component Rebuild Centers | Avoids the complex and high-risk machining of line-boring cast iron blocks and fitting non-standard oversize spools. |
| Heavy Quarry & Earthmoving Fleets | Restores synchronized multi-actuator flow distribution, allowing smooth simultaneous boom lift and stick crowd under heavy loads. |
| International Machinery Stockists | Pre-tested, export-ready inventory suitable for servicing high-population Caterpillar 323D excavators worldwide. |
KMX15N 309-5711 Main Control Valve Assembly OEM Diagnostic Guide
Use this technical diagnostic guide to identify hydraulic valve faults on your Caterpillar 323D excavator:
| Hydraulic Circuit Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Boom drops or stick retracts automatically under load | Worn boom drift reduction valve poppet seat or excessive clearance (>0.015 mm) between the main spool and cast bore, bleeding circuit oil back to tank. | Replace with a factory-tested complete KMX15N 309-5711 Main Control Valve Assembly. |
| 2. Specific actuator movement is slow while pump pressure is normal | Port overload relief valve cartridge spring fatigue or contaminated seat holding the circuit below rated relief pressure (<28 MPa). | Clean or replace individual overload relief cartridges or swap the complete pre-calibrated valve assembly. |
| 3. Joystick operates heavily or actuator spool sticks | Contamination scoring on spool lands, distorted valve block caused by uneven mounting torque, or clogged pilot end cap passages. | Flush hydraulic reservoir, replace return line filters, and install a brand new Tatan valve unit with torqued mounting bolts. |
| 4. Excavator bogs down during compound travel and digging | Straight travel spool failure or sticking stick regeneration check valve preventing balanced dual-pump flow distribution. | Inspect pilot control line pressure (3.9 MPa) and replace with a calibrated complete valve bank unit. |
Transport Packaging & Fast Global Shipping
To ensure damage-free international transport, every Tatan main control valve assembly is flushed with preservation fluid, capped with steel threaded plugs, sealed in moisture-proof barrier film, and bolted 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 hydraulic assemblies and bulk stock 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 international industrial pressure vessel safety standards.
KMX15N 309-5711 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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