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RITO Compact Excavator Piston Pump 9189971 EX27U 4415266 Hydraulic Unit 4415266 EX27 Main Hydraulic Pump Assembly

Erratic auxiliary attachment action and weak blade leveling on zero-tail-swing machines show your compact hydraulic unit is failing under pressure. When inner wear surfaces lose their seal, fluid leaks back into the case line, stalling your work in tight spots and driving up fuel consumption. Keep your small excavators running sharp with a reliable power replacement.

  • Item NO.:

    4415266
  • Order(MOQ):

    1
  • Payment:

    T/T, WESTERN UNION, CHINESE BANK,PAYPAL
  • Product Origin:

    JAPAN
  • Lead Time:

    2-3 DAYS
  • Product Details

Re-power your tight-access equipment with the high-performance RITO Compact Excavator Piston Pump 9189971. Purpose-built as a direct-fit Hydraulic Unit, this premium EX27 Main Hydraulic Pump Assembly delivers steady variable flow, restoring the quick multi-functioning capabilities your EX27U and EX27 models need.

4415266 Hydraulic Pump

 
Product Specifications

Part Number  9189971 / 4415266
Part Name Compact Variable Piston Pump Unit
Compatible Brand Hitachi
Applicable Models EX27U, EX27 Mini Excavators
Application Excavator hydraulic system
Material High Tensile Nodular Iron and Alloy Steel
Product Color Industrial Technical Grey
Working Temperature -20 to 115 degrees Celsius
Key Function Variable Micro-Fluid Generation and Zero-Tail System Flow Supply
Condition 100% New, Aftermarket / OEM Quality
Packaging Wooden Case/Reinforced Carton/Neutral Packing / Customized Box

 

Key Features & Advantages


Precision

High-Pressure Axial Variable Piston Core

delivers excellent power-to-size performance, maximizing bucket digging force in tight spaces.

Leak-Free

Advanced Bi-Metal Valve Balance Plates

reduce internal friction, preventing overheating during long continuous operations.

Direct Fitment

Compact, Space-Saving Housing Design

fits easily into tight engine bays without modifying factory brackets or hoses.

Rigorous Testing

Global Supply Tiering

We offer Original, OEM, and high-performance Aftermarket options to provide flexible procurement strategies for diverse regional markets.
 
 

 

Excavator Hydraulic Part

FAQ

Q: Fault Diagnosis: What warning signs indicate that an EX27U variable piston pump has developed internal bypass wear?
A: The machine struggles to climb trailer ramps smoothly and the boom lift drifts downward slightly under a full bucket load.
 
Q: Installation: Why is verifying the pilot pump pressure line critical when installing this new assembly?
A: Correct pilot pressure is essential to stroke the main swashplate properly; low pilot pressure causes slow machine actions even with a new pump.
 
Q: Compatibility: Does this hydraulic unit come equipped with the gear pump for the pilot system attached?
A: Yes, this complete assembly includes both the primary variable piston chambers and the integrated rear charge pump for a straightforward swap.
 
Q: Extreme Environment Performance: How does the compact pump handle high-load pavement cutting operations in mid-summer heat?
A: The premium internal bronze-faced slippers prevent scuffing and maintain high volume output, even when oil viscosity thins out under hot workloads.
 
Q: What quality options are available?

A: We provide original, OEM, and high-quality aftermarket versions with stable supply capability.

Q:Why Choose RITO?

A:Listed Factory

Stable&Reliable Quality

OEM Factory for Chinese Top Excavator Brands

Supplier to Fortune 500 Companies
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If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Leave A Message

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If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

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