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Sun gear

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Replacement Sun Gears for Excavators and Heavy Equipment

Explore replacement sun gears at Fab Heavy Parts for excavator travel drives, swing reduction assemblies, and other planetary gear applications. Our sun gear selection includes travel motor sun gears, swing sun gears, sun gear shafts, and application-specific replacement gears for selected heavy equipment models.

A sun gear is the central gear in a planetary gear system. It meshes with surrounding planet gears to transmit rotational motion and torque within the gear assembly. In excavators, planetary reduction systems are commonly used in travel drives and swing mechanisms.

Travel Motor Sun Gears and Swing Reduction Gears

Different excavator gear assemblies require different sun gear configurations.

Travel motor sun gears are used in planetary reduction systems associated with excavator travel drives. These assemblies help transfer rotational power through the final drive to move the machine's tracks.

Swing sun gears are used in applicable swing reduction assemblies, which transfer power to rotate the excavator's upper structure.

Our selection also includes sun gear shafts and designated first-stage or second-stage sun gears. Gear dimensions, tooth counts, shaft configurations, and installation positions can vary between applications.

For more information about planetary gearing and its functions, explore our guide to sun gears and planetary transmissions.

Sun Gears for Caterpillar, Hitachi, Volvo, and Other Excavators

Our sun gear listings include replacement options for selected excavator applications, such as:

  • Caterpillar: Sun gear 165-5864 for selected 311, 312, 313, and 314 excavators.

  • Hitachi: Sun gear 3069514 for selected EX200-3, EX200-5, and EX210H-5 excavators.

  • Volvo: Sun gear 7118-30490 for selected EC210, EC460, and EC460B excavators.

  • Hitachi: Sun gear shaft 2020862, listed as a 20-tooth option for selected EX200-1 and EX220-1 excavators.

These examples represent individual product listings. Compatibility depends on the specific machine configuration and gear assembly.

Choosing the Right Replacement Sun Gear

Before ordering, identify your excavator model, the applicable travel or swing assembly, and the existing gear's part number.

Compare the replacement gear's tooth count, dimensions, shaft configuration, and intended position within the planetary gear assembly. A first-stage sun gear should not be assumed interchangeable with a second-stage gear, even when both are listed for similar equipment.

Inspect related planetary gears and mating components when diagnosing gear damage, following the applicable equipment service information.

Browse our replacement sun gears and review the individual product specifications to identify a suitable option for your excavator.

Need Help Finding the Right Sun gear?

Can't find the replacement part you need? Send FAB Heavy Parts your part number, engine model, or equipment details. Our team can help review your requirements and provide a quotation.

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Frequently Asked Questions

How do I find the right sun gear for my excavator?

Start by identifying your excavator's manufacturer, model, and the part number of the existing sun gear. Check whether the gear belongs to the travel drive or swing reduction assembly. Compare the replacement listing's tooth count, dimensions, and shaft configuration where specified. We recommend confirming the gear's application before ordering because similar excavator models may use different gear assemblies.

What's the difference between a travel sun gear and a swing sun gear?

A travel sun gear operates within the planetary reduction assembly associated with an excavator's track drive, while a swing sun gear is used in the reduction system that rotates the upper structure. Both are planetary gear components, but their configurations and applications can differ. Our sun gear guide explains how sun gears function within planetary gear systems.

Can I use a sun gear with the same number of teeth as my existing one?

Not necessarily. Matching the tooth count alone does not establish compatibility. Sun gears can differ in overall dimensions, gear tooth geometry, shaft design, and intended assembly position. We recommend checking the part number and applicable equipment information before selecting a replacement.

Can you help me identify a replacement sun gear if I don't have the part number?

You can provide your excavator's manufacturer, model, and serial number, along with photographs of the existing gear. Information about whether the gear comes from the travel drive or swing reduction assembly can also help narrow down the options. Additional dimensions or assembly identification details may be necessary to confirm a suitable replacement.

What should I check if my sun gear is damaged?

A damaged sun gear may indicate wear or problems elsewhere in the planetary gear assembly. We recommend inspecting the mating planet gears, ring gear, bearings, and related components according to the equipment service manual. Replacing only the sun gear without addressing associated damage may leave the underlying problem unresolved.

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