Hyest Corporation UX28-86 14512144 hidraulični razvodnik za Hyundai EC210B bagera
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+86 199 246...
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Litvanija, Telšiai
Component: Main Hydraulic Control Valve Assembly (MCV / Hydraulic Distributor)
Manufacturer Model / Series: Toshiba / HYEST UX28-86 Series
Volvo OEM Part Numbers: VOE 14532821, VOE 14512144 (Cross-references / Supersessions: 14676421, 14505323, 14576336, 7270-00502, 1142-00950)
Machine Compatibility:
Volvo EC210B / EC210BLC / EC210B NLC / EC210B LR / EC210B FX Heavy Excavator
(Note: VOE part numbers and the Toshiba UX28-86 architecture are designed for Volvo 21-ton EC210/EC210B series machines).
Condition: Genuine Original New / Premium OEM Specification Equivalent (Complete Assembly)
2. Technical Specifications
Valve Architecture: Multi-Spool Load-Sensing Hydraulic Main Control Valve
Operating Pressure & Flow: High-pressure hydraulic distributor block engineered to balance primary hydraulic pump delivery (up to 34.3–36.3 MPa / 343–363 bar).
Circuit Management: Controls flow delivery to boom cylinders, arm cylinder, bucket cylinder, swing motor, and travel motors.
Integrated Logic Features: Features built-in boom and arm holding valves, straight-travel spools, swing priority logic, and primary/secondary pressure relief valves to ensure smooth multi-functioning and fuel efficiency.
3. Critical Installation Requirements
System Pressure Relief & Tank Decontamination
Before removing line connections, completely vent hydraulic tank reservoir pressure. If replacing a valve due to internal scoring or spool seizure, flush all hydraulic circuits, drain and clean the main hydraulic tank, and replace all return and pilot oil filters.
Port Marking & O-Ring Seal Replacement
Carefully label all high-pressure feed, pilot logic, and return hoses before disconnection. Always use brand-new high-temp NBR/FKM O-rings and split-flange seals on all hydraulic interface ports to prevent high-pressure external leaks.
System Priming & Trapped Air Bleeding
After installation and fluid top-off, bleed trapped air from the pilot control lines, main pump casing, and hydraulic cylinders by cycling each function slowly at low idle with zero load for 10 to 15 minutes.
Relief Valve & Pilot Pressure Calibration
Upon startup, verify system main relief pressure, port relief pressures, and pilot signal pressure with gauge taps. Incorrect relief settings can lead to sluggish movement, high oil temperatures, or engine stalling under heavy load.
4. Frequently Asked Questions (FAQ)
Q: Are part numbers VOE 14532821 and VOE 14512144 interchangeable?
A: Yes. VOE 14532821 and VOE 14512144 represent standard Volvo factory engineering updates, revisions, and supersessions for the Toshiba UX28-86 main control valve used on EC210B excavators. They share identical mounting dimensions, spool functions, and port thread configurations.
Q: My Volvo EC210B experiences slow hydraulic speed, boom drift, or jerky multi-function performance. Is the main control valve at fault?
A: Excessive boom/arm drift or slow multi-function response typically indicates scored internal spool bores, worn load-check valves, or stuck pilot relief spools inside the main control valve block. Installing a complete calibrated assembly restores exact pilot responsiveness and hydraulic power.
Q: Does this unit come fully assembled with the relief valves installed?
A: Yes. The Toshiba UX28-86 MCV is supplied as a complete assembly, including pre-installed main relief valves, port relief valves, and pilot signal blocks.
5. Shipping & Logistics
Packaging: Coated with anti-corrosion preservation oil, fitted with heavy-duty port caps, and bolted inside an export-safe wooden crate.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days, with sea freight options available for heavy freight logistics.