ZGAQ-04472 Hub Sun Gear Shaft for Hyundai HW140, R140W-9, R140W-9A

   The ZGAQ-04472 is a specialized gear shaft designed for the Rear Axle Hub Carrier of Hyundai’s 14-ton wheeled excavator class. Weighing approximately 1.1 kg, this sun gear is built to withstand the rigorous duty cycles of urban construction. It features precision-cut teeth that ensure a perfect mesh with the planetary gears (typically Item #100 on standard axle diagrams), reducing friction and heat during long-distance roading.

The SPARKLING MACHINERY NEW ZGAQ-04472 Shaft-sun gear Photo:

Why Choose the SPARKLING ZGAQ-04472 Shaft-sun gear?

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •    - Torque Multiplication: Optimized gear geometry allows for efficient power transfer from the drive motor to the wheel hub.

                                                            •    - Hardened Surface: Manufactured with advanced heat-treatment processes to resist tooth pitting and surface fatigue under heavy loads.

                                                            •    - Vibration Reduction: Balanced shaft design minimizes mechanical noise and vibration at higher travel speeds.

                                                            •    - Direct OEM Fit: Fully compatible with serial ranges for the R140W-9 and HW140 series, ensuring no modifications are needed during installation.

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Q&A Section

Q1: What are the symptoms of a failing ZGAQ-04472 sun gear?

A: Common signs include a high-pitched "whining" noise from the axle during travel, excessive heat at the wheel hub, or metallic debris found in the axle oil. If the teeth shear off, the wheel will lose drive power entirely.

Q2: Should I replace the planetary gears at the same time?

A: If the sun gear shows signs of scoring or broken teeth, the planetary gears and the ring gear have likely been compromised. It is best practice to inspect the entire planetary set to prevent the new sun gear from failing prematurely.

Q3: Is the ZGAQ-04472 used in the front or rear axle?

A: While often used in the rear axle hub carriers of the R140W series, compatibility can depend on the specific machine's serial number. Always verify with your parts catalog to confirm if your unit requires the same shaft for both axles.

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   - Founded in 2013, SPARKLING focuses on high-quality excavator parts across hydraulics, undercarriage, engines and electrical systems. We prioritize stability, precision and continuous service, offering worldwide distribution, tailored solutions and strict QC to help customers reduce cost and increase uptime.

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