Nullam dignissim, ante scelerisque the is euismod fermentum odio sem semper the is erat, a feugiat leo urna eget eros. Duis Aenean a imperdiet risus.

PC200 7总成 产品详情图ps压缩版
PC850 8溢流阀副图
PC850 8溢流阀副图1
PC850 8溢流阀副图2
PC850 8溢流阀结构图
PC850 8溢流阀详情图
PC200 7总成 产品详情图ps压缩版
PC850 8溢流阀副图
PC850 8溢流阀副图1
PC850 8溢流阀副图2
PC850 8溢流阀结构图
PC850 8溢流阀详情图

709-10-58501 Hydraulic Main Relief Valve for PC850-8 PC800-8

The Main Relief Valve is the ultimate safety mechanism within the excavator's main hydraulic system. It functions by continuously monitoring circuit pressure; if the pressure exceeds the maximum safe threshold during heavy rock-stripping or lifting, the valve instantly opens to bypass the excess hydraulic fluid back to the reservoir. This prevents burst hoses and blown cylinder seals. Each of our valves undergoes rigorous extreme-pressure bench testing prior to shipment to verify accurate opening thresholds, rapid response times, and leak-free seating.
  • Targeted Fitment: Engineered specifically for wide compatibility across 80 to 88-ton class heavy mining excavators, tailored for robust models including the PC800-8, PC800LC-8, PC850-8, PC850-8EO, PC850-8HD, PC850-8M0, PC850-8R, PC850-8SE, PC850LC-8, and PC880-8.
  • Cross-Reference Numbers: Serves as a direct high-precision replacement for part numbers and valve assemblies including 709-10-58501, 709-10-59300, 709-10-56200, 708-2K-03512, and 708-2K-03560.
  • Durable Construction: Manufactured in our self-owned factory using ultra-high-grade forged steel and precision-machined internal spools, designed to withstand the immense continuous fluid pressures typical of 85-ton machines without internal leakage or premature wear.
  • Quality Assurance: Supplied with a solid 6-month warranty to support your routine heavy equipment maintenance schedules and ensure operational peace of mind at the mine site.
ScreenShot 2026 06 05 165629 978
Standard CNC Machining
Internal valve spools, springs, and bores are micro-processed using high-precision CNC machinery, providing optimized clearances for instant actuation and minimized internal leakage under severe stress.
工厂9
Comprehensive Testing & Warranty
Every main relief valve undergoes rigorous high-pressure hydraulic bench testing to verify safety relief thresholds and is backed by a dependable 6-month warranty, ensuring long-term reliability for your mining fleet.
ScreenShot 2026 06 05 165805 204
Unique & Novel Export Packaging:
Items are securely packed utilizing our uniquely designed, highly durable product packaging boxes. This novel packaging design thoroughly protects delicate, high-value valve components from transit moisture and shock, delivering a premium, professional unboxing experience worthy of the mining industry.
Brand
YIKAN
Origin
Guangdong, China
Product Name
Fan motor
Model
PC850-8 Relief Valve
Part number
709-10-58501  709-10-56200 709-10-59300
Application field
Bulldozer
Warranty/Spare Parts
Six months
Quality
High guarantee
Status
100% new
Minimum order quantity
1 piece
 Packaging
Packed in wooden cases
Delivery date
7 working days
PRODUCTS

PRODUCTS

View More
HPV140(HP1250K)封面图 ps压缩版、

High-Torque Hydraulic Main Pump Shaft (Part No. 708-2G-12111) for Komatsu PC300-7 & PC360-7 (HPV140 Pump)

Premium heavy-duty hydraulic main pump front drive shaft (splined input shaft) engineered for HPV140 and HPV132 series variable displacement axial piston pumps. Direct replacement for part number 708-2G-12111 (interchangeable with 708-2G-12110), built as the primary power input interface to transfer continuous heavy engine torque directly to the rotating cylinder block in 30–36 ton class excavators.
Learn More
HPV145摇摆座封面图 ps压缩版

Heavy-Duty Hydraulic Main Pump Swash Plate / Cradle (Part No. 708-2H-04690 / 708-2H-04680) for Komatsu PC400 & PC450 Series (HPV145 Pump)

Premium heavy-duty hydraulic main pump swash plate (swash plate cradle / cam plate assembly) engineered for HPV145 series swash plate axial piston pumps (front and rear pump compatible). Direct replacement for part number 708-2H-04690, built to sustain continuous multi-ton axial thrust loads from all 9 piston shoes while delivering seamless angular deflection for variable displacement control in 40–45 ton class heavy excavators.
Learn More
HPV145气缸体封面图 ps压缩版

Heavy-Duty Hydraulic Pump Cylinder Block (Part No. 708-2H-04620) for Komatsu PC400 & PC450 Series (HPV145 Pump)

Premium heavy-duty hydraulic main pump cylinder block (pump barrel / rotary cylinder assembly) engineered for HPV145 series swash plate axial piston pumps. Direct replacement for part number 708-2H-04620, built with centrifugally cast bimetallic copper alloy bushings to guide 9 reciprocating high-pressure pistons and maintain a hydrodynamic seal against the valve plate in 40–45 ton class heavy excavators.
Learn More
HPV145配流盘 ps压缩版

High-Precision Hydraulic Main Pump Valve Plate (Part No. 708-2H-04750 / 708-2H-04760) for Komatsu PC400 & PC450 Series (HPV145 Pump)

Premium heavy-duty hydraulic main pump servo slider block (variable displacement slide block) engineered for HPV145 series axial piston pumps. Direct replacement for part number 708-2H-34150 (7082H34150), built to transmit heavy cyclic servo piston forces to the swash plate tilt pin for precise, rapid displacement regulation in 40–45 ton class heavy excavators.
Learn More
News

News

View More

11/ September

How to Test an Excavator Main Control Valve Before Installation

How to Test an Excavator Main Control Valve Before Installation
Learn More
ps压缩版

10/ September

How to determine whether to choose original factory parts or aftermaket parts

The decision of whether to use original parts or aftermarket parts is not solely based on price
Learn More
Main Control Valve Failure Symptoms in Excavators

7/ September

Main Control Valve Failure Symptoms in Excavators

Read excavator valve symptoms, pressure checks, spool wear signs, and pilot signals to decide whether repair, remanufacture, or replacement will cut downtime fast.
Learn More
New vs Remanufactured Excavator Hydraulic Pumps Which Reduces Downtime

1/ September

New vs Remanufactured Excavator Hydraulic Pumps: Which Reduces Downtime

Compare new vs remanufactured excavator pumps by downtime, fitment, test data, warranty, and restart risk so buyers choose the lower-risk option fast.
Learn More
What We Do

Services we Offer

No matter what your hydraulic maintenance needs may be, we’re here to help. Contact us today to learn more about our
services and how we can assist you with all of your needs.
Processing

Processing

With years of experience in the processing industry, we offer full-chain customized processing services with our mature production system and stringent quality control standards! Whether you are conducting small-batch trial production of new products, large-scale OEM manufacturing, or customized processing of personalized products, you can enjoy a one-stop service from demand matching to finished product delivery, helping your products to be launched efficiently and quickly to the market. We boast an experienced production team and a modern processing workshop, proficient in various OEM processes including machining, stamping, injection molding, and assembly. We can adapt to the needs of various materials such as metal, plastic, and rubber, perfectly matching diverse industry scenarios including electronics, automotive parts, household goods, hardware tools, and medical devices. From product drawing analysis and processing technology planning to process execution, precision control, and finished product inspection, every step strictly adheres to industry standards, ensuring that the processed products meet precision standards, have stable quality, and strong consistency, effectively reducing your production and operating costs.
Casting

Casting

With years of experience in the casting industry, we provide core casting solutions for your product manufacturing with our exquisite craftsmanship and rigorous quality control! Whether you are developing new products through casting, mass production with casting support, or developing customized castings, you can enjoy exclusive casting services throughout the entire process, helping your products seamlessly transition from design to mass production delivery. We boast a team of experienced casting engineers and a modern casting workshop, proficient in various casting processes such as sand casting, die casting, and precision casting. Our capabilities adapt to diverse material requirements, including cast iron, cast aluminum, cast copper, and stainless steel, perfectly matching the needs of multiple industries such as machinery manufacturing, automotive parts, construction machinery, hardware tools, and medical devices. From product drawing analysis and casting process optimization to mold making, casting, subsequent processing, and quality inspection, every step strictly adheres to international casting standards, ensuring high precision, sufficient strength, and stable performance of castings, effectively enhancing the core competitiveness of our products. We offer dedicated one-on-one service throughout the entire process, responding promptly to your needs and accelerating project progress, so you don’t need to worry about technical barriers or production delays. Professional mold making services – choosing us means choosing an efficient, reliable, and worry-free partner to help your products quickly capture the market.
Abrasive tools

Abrasive tools

With years of experience specializing in abrasive molds, we leverage our expertise to ensure the smooth mass production of your products! Whether you’re developing new products, adapting them for mass production, or upgrading existing molds, you can enjoy a full-process customized abrasive mold development service. We have a team of experienced engineers who strictly adhere to industry standards at every stage, from product drawing analysis and mold structure optimization to mold processing and trial molding. We utilize advanced production equipment and high-quality raw materials to ensure high precision, long lifespan, and stable molding, effectively reducing your production losses. We offer dedicated one-on-one service throughout the entire process, responding promptly to your needs and accelerating project progress, so you don’t need to worry about technical barriers or production delays. For professional mold making, choosing us means choosing an efficient, reliable, and worry-free partner to help your products quickly capture the market!
Call For Help
Hydraulic Equipment

Contact Us

We have our own R&D and production team that supports small batch customization and sample processing related to hydraulic maintenance.

    Your Name*

    Email*

    Tel*

    WhatsApp*

    Message*

    Products
    Contacts
    WhatsApp
    Email