Description
CLSS 723-40-71103 Main Control Valve Assembly by Tatan Overview
The CLSS 723-40-71103 Control Valve assembly manufactured by Tatan is a heavy-duty 7-spool monoblock hydraulic distribution unit belonging to our Main Control Valve Assembly classification. Engineered specifically for Komatsu PC400-8, PC400LC-8, and PC450-8 40-ton mining excavators, replacing your worn control valve with a Tatan complete assembly eliminates cylinder settling under large rock bucket loads, restores instantaneous multi-function cycle speed, and cures internal pressure bypass across demanding quarry and mining applications.
Fed by high-volume fluid from the excavator’s HPV165 hydraulic pump and powered by the 257 kW SAA6D125E-5 diesel engine, this hydraulic distribution valve incorporates precision micro-lapped alloy spools, dual heavy-duty boom holding valves, pressure-compensation check poppets, and an integrated straight-travel spool, ensuring 100% direct bolt-on installation with chassis hydraulic hard lines and cylinder pilot hoses.
Key Attributes & Technical Parameters for CLSS 723-40-71103 Control Valve
| Product Category | Main Control Valve Assembly | Warranty | 1 Year / 12 Months |
| Specific Valve Model | Komatsu CLSS 7-Spool Extra-High-Flow Valve (PC400-8) | Brand Name | Tatan |
| Compatible Equipment | Komatsu PC400-8 | PC400LC-8 | PC450-8 | OEM Part Number | 723-40-71103 / 723-40-71102 |
| Matched Engine Series | Komatsu SAA6D125E-5 Engine (257 kW / 11.04L) | Place of Origin | Guangdong, China |
| Max Relief Pressure | 34.3 – 37.3 MPa (343 – 373 bar) | Pilot Control Pressure | 3.9 MPa (39 bar) |
| Spool Precision Spec | Micro-Lapped < 0.003 mm Clearance | Quality Status | 100% Brand New Monoblock Assembly |
| Machinery Test Report | Provided (100% Bench Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Hydraulic Fluid Spec | ISO VG 46 / VG 68 Anti-Wear Oil | Packaging | Export Wooden Box Packaging |
Supported Excavator Machinery Brands & Global Coverage
In addition to Komatsu, Tatan manufactures and distributes replacement main control valves and hydraulic distribution components for major equipment brands:
45-Ton Heavy Mining Hydraulic Flow Architecture & Multi-Spool Component Rebuild Matrix
Controlling 40~45 ton heavy hydraulic cylinders under massive volumetric flow requires uncompromising internal gallery integrity. Tatan supports heavy repair workshops and mining fleet operations with complete factory-tested control valves, port relief cartridges, pressure compensators, and complete seal rebuild kits across premier hydraulic platforms:
⚖️ Pressure Compensation
Calibrated CLSS pressure-reducing valves balance multi-spool loads, ensuring steady compound digging speeds under 2.8 m³ bucket loads.
🔒 Dual Holding Poppets
Factory-seated check valves lock heavy boom and arm cylinders firmly in position during deep trenching and rock slab hoisting.
🛠️ Micro-Lapped Spools
Precision-ground alloy steel spools with < 0.003 mm bore clearances eliminate high-pressure bypass and hydraulic oil overheating.
Application Scenarios & Buyer Value
When upgrading or replacing your 40-ton excavator hydraulic distribution system with our CLSS 723-40-71103 Control Valve, buyers achieve maximum operational uptime and flow control:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Komatsu PC400-8 Valve Replacement | 1:1 direct bolt-on installation eliminates cylinder settling and restores simultaneous boom, arm, and swing speeds. |
| Hydraulic Overhaul Workshops | Avoids the complex labor of internal bore honing; saves mechanic hours with a pre-adjusted, factory-tested unit. |
| Mining & Quarry Fleet Operations | Heavy-duty alloy spools withstand continuous 37.3 MPa relief pressures during heavy rock-breaker hammer operations. |
| Heavy Equipment Parts Stockists | Fast-moving, high-demand 40-ton control valve inventory ready for immediate shipment to minimize customer downtime. |
CLSS 723-40-71103 Control Valve OEM Diagnostic & Troubleshooting Guide
Use this OEM manual hydraulic diagnostic guide to troubleshoot control valve symptoms on your Komatsu PC400-8 excavator:
| Hydraulic Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Boom drops / drifts downward under heavy 2.8 m³ rock loads | Boom holding check valve poppet seat micro-erosion or internal pilot spool seal wear allowing high-pressure fluid leakage back to the tank. | Replace with Tatan 723-40-71103 complete control valve assembly with factory pre-seated heavy-duty holding valve cartridges. |
| 2. Compound motion hesitation (boom up & swing slow down together) | CLSS pressure-compensation spool sticking or LS shuttle check valve contamination failing to balance multi-spool priority flow under high resistance. | Disassemble and ultrasonic clean valve galleries; calibrate main relief valve popping pressure to 37.3 MPa boost setting. |
| 3. Hydraulic oil boiling hot (> 85°C) within 2 hours of loading | Severe internal spool bypass between valve body galleries caused by micro-scoring from abrasive quarry dust under heavy 257 kW output. | Install Tatan new 723-40-71103 main control valve; flush hydraulic tank lines and install fresh 10μm return filter elements. |
| 4. Excavator veers off course when digging while traveling | Straight-travel valve spool seized or travel merge check valve seat wear causing unequal track flow under simultaneous digging. | Inspect straight-travel pilot control pressure, clean spool bore, or replace complete main control valve assembly. |
Transport Packaging & Certified Manufacturing Standards
To ensure 100% damage-free international transport, every Tatan PC400-8 main control valve undergoes anti-rust oiling, waterproof plastic sealing, and solid export wooden box packaging:
CLSS 723-40-71103 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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