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PC400 7总成副图3
PC400 7总成副图1
PC400 7总成副图2
PC400 7总成副图
PC400 7总成副图3
PC400 7总成副图1
PC400 7总成副图2
PC400 7总成副图

708-2H-03022 Main Pump Servo Piston Assembly for PC400-7 PC450-7

The Servo Piston Assembly is a critical internal actuator within the main hydraulic pump. Working in tandem with the PC (Pump Control) valve, it responds to pressure signals to accurately adjust the angle of the pump's swashplate, thereby regulating the immense output flow to match the excavator's heavy operational loads. Each of our servo pistons undergoes rigorous dimensional tolerance checks and surface finish inspections prior to shipment to guarantee seamless integration and responsive pump control upon installation.
  • Targeted Fitment: Engineered specifically for wide compatibility across 38 to 45-ton class heavy-duty crawler excavators, tailored for robust models including the PC380-7, PC390-7, PC400-6, PC400-7, PC400-7EO, PC400LC-7, PC420-7, PC450-7, and PC450LC-7.
  • Cross-Reference Numbers: Serves as a direct high-precision replacement for part numbers and pump internal assemblies including 708-2H-03022, 708-2H-03120, 708-2H-03411, 708-2H-03031, 708-2H-03026, and 708-2H-03024.
  • Durable Construction: Manufactured in our self-owned factory using ultra-high-grade hardened steel, featuring micro-polished surfaces to ensure smooth actuation, prevent internal pump leakage, and withstand continuous high-pressure loads characteristic of heavy earthmoving.
  • 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 job site.
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Self-Owned Factory Production
Produced directly in our independent manufacturing facility, allowing for strict quality control over the machining, hardening, and finishing of highly precise internal hydraulic pump components designed for heavy equipment.
工厂9
Comprehensive Testing & Warranty
Every servo piston undergoes rigorous dimensional and surface roughness inspections and is backed by a dependable 6-month warranty, ensuring long-term reliability for your mining fleet.
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Unique & Novel Export Packaging
Items are securely packed utilizing our uniquely designed, highly durable product packaging boxes. This novel packaging design thoroughly protects delicate, polished hydraulic components from transit moisture and physical shock, delivering a premium unboxing experience worthy of top-tier mining equipment.
Brand
YIKAN
Origin
Guangdong, China
Product Name
Fan motor
Model
PC400-7 Assembly
Part number
708-2h-03022 708-2H-03120 708-2H-03411
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

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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.
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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.
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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.
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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.
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News

News

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How to Test an Excavator Main Control Valve Before Installation

14/ September

How to Test an Excavator Main Control Valve Before Installation

Check bench tests, pressure settings, leakage, fitment, and inspection steps before installing an excavator main control valve safely on site with less rework.
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14/ September

How to choose the right excavator and compatible pump for different work scenarios

This article provides a comprehensive guide on selecting the appropriate excavator hydraulic pump for specific working scenarios, including heavy-duty mining, precision municipal projects, and high-frequency loading. It details the classifications of different hydraulic systems and highlights critical technical specifications, providing specific Komatsu pump part numbers to ensure accurate matching of heavy construction machinery components. By selecting the correct pump configuration, equipment managers can significantly improve operational efficiency and reduce overall lifecycle costs.
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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
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Main Control Valve Failure Symptoms in Excavators

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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.
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What We Do

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No matter what your hydraulic maintenance needs may be, we’re here to help. Contact us today to learn more about our
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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!
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We have our own R&D and production team that supports small batch customization and sample processing related to hydraulic maintenance.

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