Гидрораспределитель K1025391 для экскаватора Doosan DX220 DX225LC DX225LCA DX230LC DX235NLC

1. Product Identification
Component: Main Hydraulic Control Valve Assembly (MCV / Hydraulic Distributor)

Doosan / Develon OEM Part Numbers: K1025391, 410105-01179, 410105-01451A, 410105-01451 (41010501179, 41010501451A, 41010501451)

Machine Compatibility:

Doosan / Daewoo DX220 / DX220A / DX220AF

Doosan / Daewoo DX225LC / DX225LCA / DX225LL / DX225NLC

Doosan / Daewoo DX230LC / DX235NLC

Condition: Genuine Original New / Premium OEM Specification Equivalent (Complete Assembly)

System Function: Serves as the central hydraulic distribution unit, directing high-pressure fluid from the main hydraulic pumps to the boom, arm, bucket, swing motor, and travel motors.

2. Technical Specifications
Valve Architecture: Multi-Spool Dual-Block Load-Sensing Hydraulic Main Control Valve

Operating Pressure: High-pressure system engineered to manage main pump delivery up to 34.3–36.3 MPa (343–363 bar) under heavy digging and power-boost modes.

Flow Management: Designed for twin-variable displacement axial piston pumps, providing proportional flow control across all excavator work groups.

Integrated Logic Features:

Integrated boom and arm regeneration spools for fast cycle speeds and reduced pressure drop.

Straight-travel logic spool to ensure straight tracking during simultaneous attachment use.

Built-in boom/arm anti-drift holding valves.

Main pressure relief valve and individual port crossover shock-relief valves.

3. Critical Installation Requirements
System Depressurization & Reservoir Flushing
Before disconnecting hydraulic lines, completely vent hydraulic tank reservoir pressure. If replacing the control valve due to internal mechanical contamination or spool binding, thoroughly drain and flush the hydraulic reservoir, clean feed lines, and replace all return, suction, and pilot oil filter elements.

Hose Tagging & Seal Replacement
Carefully mark all high-pressure work lines, pilot logic hoses, and return lines prior to removal. Always replace split-flange O-rings and thread port seals with brand-new high-temperature NBR/FKM seals to prevent external leakage.

System Priming & Air Bleeding
After mounting the new distributor assembly and filling fluid levels, manually bleed air from the main pump housing, pilot logic manifolds, and cylinder ports. Operate the machine at low engine idle with no load for 10 to 15 minutes, cycling each cylinder and travel motor slowly to purge trapped air.

Pressure Relief & Pilot Setting Verification
Verify system main relief pressure, pilot signal pressure, and secondary port relief settings using hydraulic pressure test gauges. Improper pressure settings can cause sluggish implement speeds, hydraulic fluid overheating, or engine lugging under heavy load.

4. Frequently Asked Questions (FAQ)
Q: Are part numbers K1025391, 410105-01179, and 410105-01451A interchangeable?
A: Yes. These part numbers represent standard Doosan/Daewoo factory supersessions, production revisions, and regional catalog updates for the 22-ton class DX-series excavators. They share matching mounting footprint dimensions, port thread sizes, and spool flow parameters.

Q: My Doosan DX225LC experiences slow boom lift, arm drift, or erratic multi-function response. Is the main control valve failing?
A: Excessive cylinder drift, slow multi-function movement, or pressure loss across circuits usually points to worn internal spool bores, damaged load-check seats, or sticking pilot relief spools inside the main control valve block. Installing a replacement valve restores precise hydraulic control and system power.

Q: Does this main control valve unit arrive fully assembled with relief valves pre-installed?
A: Yes. The unit is delivered complete as a single integrated distributor block, pre-fitted with factory-set main relief valves, port relief valves, and pilot control spools.

5. Shipping & Logistics
Packaging: Preserved with anti-corrosion storage oil, fitted with heavy-duty port caps, and bolted securely 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.