Doosan DH55 Main Control Valve Assembly – 100% Brand New (OEM 2436-1004 / 401-00058)

The primary hydraulic control center of the 5.5-ton Doosan DH55 (and Daewoo Solar 055) governs high-pressure flow to the boom, stick, bucket, swing, dozer blade, and dual travel motors. Tatan Machinery stocks and supplies 100% Brand New multi-spool hydraulic main control valve assemblies (OEM reference: 2436-1004 / 2436-1004A, interchangeable with 401-00058 / 2436-1004B). Featuring precision-lapped alloy steel spools and factory-set relief cartridges, each complete assembly restores precise compounding control and holding power. Backed by our 12-Month Comprehensive Replacement Warranty.

Technical Specifications & Operating Parameters

Field Diagnostics: Why Rebuilding Worn DH55 Control Valves Fails

The Doosan DH55 performs continuous heavy earthmoving, demolition breaking, and trench grading. Over thousands of hours, high-pressure fluid wear inside the valve body causes issues that simple seal kits cannot cure:

• Dozer Blade Bleed-Down & Loss of Machine Stabilization: When jacking the excavator up on its front dozer blade to clear tracks, the blade sinks within minutes. Pilot-operated holding check valve seats or spool bores have washed out, failing to hold hydraulic pressure.
• Boom & Arm Drift under Suspended Load: Lifting heavy trench boxes or rocks causes the boom to slowly creep down with joysticks in neutral. Spool-to-bore clearances exceeding 0.018mm dump high-pressure holding oil directly back to tank.
• Sluggish Compound Motions (Boom-Up + Stick-Crowd Hesitation): Scorched internal metering notches fail to divide flow properly between circuits. The excavator jerks or slows down when trying to dig and lift simultaneously.
• Washed-Out Main Relief Valve Seats: Fluid erosion around the main relief cartridge continuously bleeds pump pressure, overheating the hydraulic tank (>85°C) and killing breakout force.

Warehouse Inventory Walkthrough & Stock Verification

Because this is a 100% Brand New hydraulic component (only our diesel engines are remanufactured), we document our physical warehouse stockholding, palletized inventory, and port-sealing quality directly on camera:

12-Month Comprehensive Replacement Warranty

Every 100% Brand New 2436-1004 control valve supplied by Tatan Machinery includes our full 12-Month Replacement Guarantee:

• Full Hydraulic Coverage: Body casting crack failures, internal spool scoring, dozer holding valve leakage, and relief regulation failure resulting from manufacturing defects.
• Direct Replacement Support: If any defect occurs under proper hydraulic maintenance, we dispatch immediate replacement components or complete valve blocks without lengthy disputes.

Export Heavy-Duty Packaging Protocol

A heavy 68 kg multi-spool valve block requires clinical protection against contamination and rough transit:

• 100% Sealed Port Caps: Every hydraulic work port, pump inlet, tank return, and auxiliary line port is sealed with heavy-duty threaded protective plugs.
• VCI Vapor-Phase Anti-Corrosion Wrap: The bare valve block is coated with rust-inhibiting hydraulic film and hermetically vacuum-sealed in VCI plastic foil.
• Custom Internal Structural Timber Cushioning: Bolted securely onto structural base timbers inside the crate to prevent any shift.
• ISPM 15 Fumigation-Free Solid Plywood Box: Fully enclosed export crate banded with multiple high-tensile galvanized steel straps.

Actual sealed port caps, protective anti-corrosion wax, and reinforced wooden crating

Supported Global Logistics & Customs Documentation

Prompt logistics dispatch adapted for urgent machine-down emergencies and trade stock:

• Air Express (3–7 Days Door-to-Door): Handled via DHL Express, FedEx, or air cargo for rapid jobsite recovery.
• Sea Freight Consolidation: Economical LCL shipping for distributors stocking multiple units.
• Tariff-Ready Paperwork: Commercial invoice detailing official HS Code (8481.20 – Valves for Oleohydraulic Transmission), packing lists, and Certificate of Origin (COO) upon request.