723-21-04200 Hydraulic Control Valve for Komatsu Excavator

Place of Origin	China/Japan
Brand Name	LIRACE/Komatsu
Model Number	PC78MR-6 PC78US-6 PC78UU-6
Minimum Order Quantity	1 PCS
Price	Negotiable price
Packaging Details	Wooden case or as required
Delivery Time	5-8 Weekdays
Payment Terms	Western Union,T/T
Supply Ability	300pcs /Month

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Basic Parameters & Introduction

"This high-precision multi way control valve assembly (main distribution valve) has core original part numbers and cross index numbers including: 723-21-0420 (also written as 7232104200), 723-29-50601, and 723-29-50600. This assembly serves as the core center for fluid power distribution and logic control, specially designed for Komatsu's core small tonnage excavators, perfectly matching 7 ton main models such as PC78MR-6, PC78US-6, and PC78UU-6. The product is based on first principles for precise design of internal slide valve flow channels, fully bearing special loads of frequent composite actions in micro and urban working conditions, ensuring absolute control certainty. The physical dimensions of the packaging are approximately 480mm × 330mm × 350mm, with an overall net weight of approximately 42kg. The original factory standard position is connected.
"

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Maintenance Tips

"Daily inspection (every 10 hours): Before starting work, it is mandatory to inspect the valve body, pipes, and main oil pipe joints, with a focus on checking the valve stem for dust and preventing any trace leakage.

High precision filter conditioning (every 500 hours): The hydraulic return oil filter and high-precision pilot filter must be replaced every 500 hours to forcibly remove micron sized hard metal particles that may invade the circuit and prevent valve core jamming.

Thoroughly replace oil and clean (every 2000 hours): The hydraulic oil tank must be thoroughly cleaned and replaced with original standard anti-wear hydraulic oil within a maximum of 1 year. If in a harsh crushing condition, the above cycle needs to be forcibly shortened by 50%."

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Installation Tips

"Extreme error prevention and dust-free (core pit avoidance): The unpacking and installation environment needs to be treated with noise reduction and dust removal. Before connecting the pipeline, all joints must be thoroughly cleaned. The distribution of the pilot pipe mouth of the main valve is compact, and each oil pipe must be rigidly numbered during disassembly. It is strictly prohibited to connect the conduit with the main oil pipe in a staggered manner to prevent logical disorder.

Symmetrical tightening with torque: The installation bolts of the valve body and high-pressure flange bolts must be tightened in stages and symmetrically with torque wrenches strictly according to the original factory's specified torque, to prevent slight deformation of the valve body and blockage of the valve core caused by uneven local stress.

Low pressure full stroke exhaust: After installation, the engine must be kept idling for 15 minutes for the first ignition. Subsequently, control the boom and arm to perform several full stroke slow reciprocating movements, thoroughly exhaust the circuit air, and gradually apply the load only after the thermodynamic state is stable."

Brand	China/Japan	Brand Name	LIRACE/Komatsu
Model	PC78MR-6 PC78US-6 PC78UU-6	Product Name	Main Control Valve
Part Number	723-21-04200 7232104200 723-29-50601 723-29-50600	ApplicableBrand	Komatsu
Warranty Period	6-12 months	Condition	NEW
Standard or Non-standard	Standard Type	Guarantee	We will inspect the products and send detailed pictures to the buyer for confirmation.
Applicable Industries	Mechanical Repair Shops, Retail, Construction, Energy, Mining	Shipping Method	Sea freight, Air freight, DHL/FEDEX/TNT/EMS

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What if there are quality problems with the purchased products?

Please rest assured completely. We implement strict quality control throughout the whole production process. From raw material incoming inspection to finished product delivery, all items undergo multiple rounds of rigorous technical inspection and performance testing, to fully ensure every delivered product meets 100% qualified standards. All unqualified products detected during inspection will be disposed of by centralized destruction, to firmly prevent defective goods from entering the market. Meanwhile, we provide an extended warranty period of 6 to 12 months for all products. Within the warranty period, if any non-artificial quality failure occurs, please contact us promptly. Our professional technical team will respond at the earliest time and offer targeted solutions based on actual conditions. In addition, we deliver all-round technical support to safeguard your after-sales operation. Always taking customer satisfaction as the core principle, we are committed to establishing long-term and stable cooperative partnerships with global clients.

What happens if the delivered item is unsuitable for my needs?

Please rest assured. To ensure that the products you receive fully meet your needs, we will conduct multiple rounds of demand confirmation with you before shipment, fundamentally avoiding the problem of wrong or missing delivery. To further ensure accuracy, we will first conduct precise query and verification through the product part number you provide to ensure that the product model and specifications are completely matched. If you do not have an accurate part number temporarily, we will arrange professional technicians to check and confirm one by one according to the clear product pictures and corresponding construction machinery models you provide, and communicate and synchronize with you throughout the process until confirmed correct before arranging shipment, to fully ensure that you receive the products you need and avoid unnecessary troubles.

What professional shipping and delivery standards can we provide you?

Within our international trade operations, we prioritize a high-efficiency supply chain and a transparent logistics framework. To ensure the accuracy of every shipment, a standardized PDI (Pre-Delivery Inspection) system is strictly enforced. Before the final sealing of containers, our QC specialists conduct a thorough re-examination. We provide clients with high-resolution photos of the actual items, packaging details, and the Packing List for Visual Confirmation, ensuring 100% compliance with order specifications and delivery transparency. We support versatile Incoterms, including EXW and FOB. To meet diverse delivery timelines and cost constraints, we offer a multi-modal logistics matrix ranging from Ocean Freight and Air Freight to global couriers (DHL/FEDEX/TNT/EMS). We guarantee full professional documentation support for every shipment to ensure a safe, timely, and compliant arrival at the port of destination.

We are a global one-stop supplier of excavator spare parts. We maintain full control over the entire process from R&D and manufacturing to sales, delivering top-quality excavator components to you.

723-21-04200 Hydraulic Control Valve for Komatsu Excavator

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What if there are quality problems with the purchased products?

What happens if the delivered item is unsuitable for my needs?

What professional shipping and delivery standards can we provide you?

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