Description
KMX32N 4434686 Main Control Valve Assembly Overview
The KMX32N 4434686 Main Control Valve Assembly manufactured by Tatan is a heavy-duty multi-spool hydraulic directional control block belonging to our Main Control Valve Assembly classification. Engineered specifically for Hitachi EX400-5, EX400-3, EX450, and EX400LC 40-45 ton heavy mining excavators, swapping to a complete KMX32N 4434686 Main Control Valve Assembly unit eliminates hydraulic cylinder drifting, sluggish boom hoist response, and compound movement lag under demanding quarry and mining operations.
Constructed from high-tensile alloy cast iron with a shipping weight exceeding 240 kg, this assembly houses precision-ground spools with micro-tolerances of 0.008 mm to handle high-flow pump discharges over 360 L/min per section from dual K3V180DTH pumps. Pre-fitted with pilot-operated pressure relief valves and load-holding checks, it ensures exact flow division between dual hydraulic main pumps and attachment cylinders under severe rock breakout conditions.
Key Attributes & Parameters for KMX32N 4434686 Main Control Valve Assembly
| Product Category | Main Control Valve Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Kawasaki KMX32N / KMX32NA Control Valve | Brand Name | Tatan |
| Compatible Equipment | Hitachi EX400-5 | EX400-3 | EX450 Excavator | OEM Part Number | KMX32N / 4434686 / 4453503 |
| Main Relief Pressure | 34.3 MPa (343 Bar) / Boost 37.3 MPa | Port Overload Relief | 37.3 – 39.2 MPa (373 – 392 Bar) |
| Spool Bore Tolerance | 0.007 – 0.009 mm Precision Ground | Integrated Circuits | Dual Boom Confluence, Arm Merge, Swing Priority |
| Machinery Test Report | Provided (100% Bench Pressure Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Body Metallurgy | High-Tensile Alloy Cast Iron Block (240kg+) | Place of Origin | Guangdong, China |
| Quality Status | 100% Brand New Control Valve Unit | Packaging | Export Reinforced Wooden Box Packaging |
Supported Machinery Brands & Control Valve Coverage
In addition to Hitachi, Tatan manufactures replacement complete main control valves, hydraulic manifolds, and spool cartridges for leading machinery brands:
Application Scenarios & Buyer Value
When resolving hydraulic distribution and control faults with our KMX32N 4434686 Main Control Valve Assembly, workshops and equipment contractors secure tangible operational benefits:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi EX400-5 Valve Bank Replacement | Swapping to the KMX32N 4434686 Main Control Valve Assembly completely eliminates machine downtime caused by internal spool scoring and housing micro-cracks under 40-ton rock loads. |
| Heavy Mining Equipment Rebuilders | Avoids the high cost and failure rate of line-honing worn large-bore valve bodies and fitting oversized spools that cause ongoing leakage comebacks. |
| Quarry & Mass Earthmoving Fleets | Restores full 34.3 MPa digging breakout force and smooth compound boom-arm actions without engine lugging down under massive 2.0 m³ bucket bites. |
| Global Heavy Machinery Stockists | Pre-calibrated, export-ready inventory ready for immediate shipment to international contractors operating classic 40-ton Dash series machinery. |
KMX32N 4434686 Main Control Valve Assembly OEM Diagnostic Guide
Use this technical diagnostic guide to identify hydraulic control circuit faults on your Hitachi EX400-5 excavator:
| Hydraulic Circuit Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Boom drops or arm automatically drifts under heavy 2.0 m³ load | Internal seal deterioration on the boom holding valve poppet seat, or excessive spool-to-bore clearance (>0.018 mm) bypassing circuit oil to tank. | Replace with a complete factory-tested KMX32N 4434686 Main Control Valve Assembly. |
| 2. Individual attachment function moves slowly under full throttle | Port overload relief valve spring fatigue or contaminated poppet seat cracking below rated working pressure (<26.0 MPa). | Clean or replace individual overload relief cartridges or swap to a pre-calibrated complete valve bank. |
| 3. Joystick feels heavy or hydraulic spool sticks in stroke | Particulate contamination scratching spool lands, uneven mounting bolt torque warping the heavy casting, or varnished pilot end caps. | Flush hydraulic oil gallery, replace return line filters, and install a brand new valve bank with specified torque settings. |
| 4. Excavator bogs down during simultaneous boom lift & swing | Stuck swing priority spool or clogged pilot confluence orifice preventing proportional dual-pump flow merging across main sections. | Inspect pilot line pressure (3.9 MPa) and replace with a pre-adjusted complete valve assembly. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan main control valve assembly is preserved with anti-corrosion fluid, capped with steel threaded plugs, sealed in heavy waterproof film, and bolted inside an export-grade reinforced 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 240kg+ control valves and bulk fleet inventory.
📦 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 industrial pressure equipment safety directives.
KMX32N 4434686 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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