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RITO Excavator Swing Motor Repair Kit Hydraulic Pump Piston 39Q6-11220-DM HX520L PISTON for Hyundai

Slewing power loss and internal friction cause jerky rotation and costly downtime for HX520L fleets. Low-grade pistons wear quickly under high-pressure cycles, leading to total swing motor failure. The 39Q6-11220-DM ensures a precision fit. This high-strength piston restores smooth rotation and hydraulic efficiency.

  • Item NO.:

    39Q6-11220
  • Order(MOQ):

    1
  • Payment:

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

    JAPAN
  • Lead Time:

    2-3 DAYS
  • Product Details

Protect your bottom line from the high cost of hydraulic failure. The 39Q6-11220-DM eliminates the risks of unverified components in high-impact mining. Precision-engineered for the HX520L, this vacuum-hardened piston delivers OEM-grade reliability, ensuring your fleet stays active and your maintenance costs stay low.

39Q6-11220 Piston

 
Product Specifications

Part Number  39Q6-11220-DM
Part Name Swing Motor Piston
Compatible Brand Tongmyung
Applicable Models Hyundai HX520L
Application Excavator hydraulic system
Material High‑strength Alloy Steel
Product Color Steel Grey
Working Temperature -25°C to 110°C
Key Function Converting hydraulic pressure into mechanical torque for motor rotation
Condition 100% New, Aftermarket / OEM Quality
Packaging Wooden Case/Reinforced Carton/Neutral Packing / Customized Box

 

Key Features & Advantages


Precision

High-Hardness Alloy Steel

Forged from premium alloy steel with vacuum heat treatment to resist deformation and surface fatigue under intense hydraulic pressure cycles.

Leak-Free

Precision Ground Finish

Each 39Q6-11220-DM piston is micro-polished to micron-level tolerances, ensuring a low-friction interface and preventing internal oil bypass.

Direct Fitment

Direct HX520L Compatibility

Specifically engineered as a drop-in replacement for Hyundai HX520L swing motors, eliminating the need for modifications and reducing installation time.

Rigorous Testing

 Multi-Tier Quality Options

We provide Original, OEM, and Premium Aftermarket grades, allowing distributors to meet diverse client budgets and performance needs.

 

Excavator Hydraulic Part

FAQ


Q: What specific failure symptoms indicate the 39Q6-11220-DM pistons need replacement?
A: If the HX520L exhibits excessive "swing drift" when stopped or a noticeable drop in slewing speed under load, the pistons are likely worn. Scoring on the 39Q6-11220-DM surface allows high-pressure oil to leak into the case drain, causing the motor to lose torque and generate excessive heat during operation.
 
Q: What are the critical technical requirements for installing these hydraulic pistons?
A: Cleanliness is paramount; ensure the cylinder block bores are inspected for scoring before inserting the new 39Q6-11220-DM. All pistons must be lubricated with clean hydraulic oil during assembly. We recommend replacing the full set of pistons and the valve plate simultaneously to ensure balanced pressure and even wear across the motor.
 
Q: How can we verify the 39Q6-11220-DM is the correct fit for our Hyundai fleet?
A: Procurement teams should cross-reference the part number 39Q6-11220-DM with the swing motor nameplate on the HX520L. Our team provides detailed technical measurements including piston diameter and total length to ensure 100% compatibility for agents managing large-scale equipment fleets.
 
Q: How does this piston perform in extreme mining or high-temperature environments?
A: The 39Q6-11220-DM is built for thermal resilience, maintaining its structural integrity in temperatures up to 110°C. In high-load mining environments, the specialized metallurgy prevents the "smearing" effect common in inferior parts, ensuring consistent rotation performance even during continuous 24/7 excavation cycles.
 
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.

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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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