Main control valve 723-19-12600 hydraulic distributor for Komatsu PC35MR-2 mini excavator
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Component: Main Hydraulic Control Valve Assembly (MCV / Hydraulic Distributor)
Komatsu OEM Part Numbers: 723-19-12600, 723-19-12601, 723-19-12602, 723-19-12603, 723-19-12604, 723-18-15900, 723-18-15901, 723-18-15902, 723-18-15903, 723-18-15904, 723-11-11870, 723-11-11890, 723-1A-15700
Machine Compatibility:
Komatsu PC35MR-2 Mini Excavator
Komatsu PC30MR-2 / PC35MR-2 Series Compact Hydraulic Excavators
Condition: Genuine Refurbished / Rebuilt to Factory OEM Specifications (Fully Tested & Bench Calibrated)
System Function: Serves as the central hydraulic distribution block, routing pressurized oil from the main pump to the boom, arm, bucket, swing, blade, and travel motors according to operator controls.
2. Technical Specifications
Valve Architecture: Multi-Spool Load-Sensing Hydraulic Main Control Valve Assembly
Operating Pressure: High-pressure system rated to manage main hydraulic pump pressures up to 24.5–26.5 MPa (245–265 bar).
Flow Distribution: Factory-calibrated flow profile tailored specifically for 3.5-ton mini excavator hydraulic circuits.
Integrated Logic Circuits:
Dual boom confluence & arm speed control circuits.
Straight-travel spool to maintain linear tracking during simultaneous attachment use.
Integrated boom/arm load holding and anti-drift check valves.
Pre-calibrated main relief valve and individual circuit crossover relief valves.
3. Critical Installation Requirements
System Depressurization & Reservoir Flushing
Before removing line connections, completely relieve pressure in the main hydraulic tank. If replacing a valve block due to internal contamination or pump failure, thoroughly flush the main reservoir, clean feed lines, and replace all suction, return, and pilot filter elements prior to engine startup.
Hose Marking & O-Ring Replacement
Carefully label all high-pressure work lines, pilot logic hoses, and return lines before disconnection. Always use brand-new high-temperature NBR/FKM O-rings and thread seals across all manifold interface ports to ensure leak-free operation.
System Priming & Air Bleeding
After installing the valve assembly and refilling hydraulic fluid, manually bleed air from the main pump housing, pilot manifolds, and cylinder line taps. Operate the engine at low idle for 10 to 15 minutes, cycling each cylinder and travel function slowly with zero load to purge trapped air.
Pressure Verification
Verify system main relief pressure, pilot control signal pressure, and auxiliary port relief settings using hydraulic pressure gauges upon initial testing. Incorrect pressure settings can cause sluggish implement speed or engine stalling under load.
4. Frequently Asked Questions (FAQ)
Q: Are part numbers 723-19-12600 through 723-19-12604 fully interchangeable?
A: Yes. These part numbers represent standard Komatsu factory revisions, engineering updates, and supersessions for the PC35MR-2 series control valve. All share matching mounting dimensions, spool logic, and port connection specifications.
Q: My Komatsu PC35MR-2 experiences slow boom lift or cylinder drift under load. Is the main control valve at fault?
A: Uncommanded cylinder drift, slow multi-function response, or pressure drops usually indicate worn internal spool-to-bore tolerances, compromised holding valve seats, or sticking relief valves inside the MCV. Installing a refurbished distributor assembly restores full factory responsiveness.
Q: Does this refurbished unit come complete with relief valves installed?
A: Yes. The valve is supplied as a complete assembly, thoroughly cleaned, rebuilt with new seals, bench-tested, and pre-fitted with factory-calibrated relief valves.
5. Shipping & Logistics
Packaging: Preserved with rust-inhibiting anti-corrosion oil, fitted with protective port caps, and secured inside an export-safe wooden crate or heavy-duty box.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days directly to your workshop or job site.