ranroswang@hksparkling.com 
+86 138 2341 8469
4606438 Swing Circle Bearing for Hitachi ZX30U-2, ZX33U-3 & John Deere 35D
The 4606438 Swing Circle (also known as a Slewing Ring or Swing Bearing) is a critical structural component that connects the excavator's upper carriage to the lower undercarriage.
Application & Compatibility
· Hitachi Models: ZX30U-2, ZX30U-3, ZX33U-3, ZX35U-2, ZX35U-3, ZX38U-3, ZX40UR-2, ZX40UR-3, etc.
· John Deere Models: 35D Excavator.
· Cross-Reference/Alternative Number: This part is frequently interchangeable with part number 4723481.
Thank you for choosing SPARKLING MACHINERY, your reliable supplier of undercarriage and hydraulic parts. The 4606438 swing circle bearing is a heavy-duty internal-tooth slewing ring designed for Hitachi ZX30U-2, ZX33U-3 and John Deere 35D mini excavators. As the “joint” of the machine, it supports the upper structure, transmits swing torque, and withstands complex loads during digging and slewing. Made from high-grade forged steel with hardened raceways and dual rubber seals, it delivers smooth rotation, high durability, and excellent resistance to dirt and water in tight job sites. Direct OEM replacement ensures easy installation with no modifications needed.
The SPARKLING MACHINERY NEW 4606438 Swing Circle Motor Photo:
Why Choose the SPARKLING 4606438 Swing Circle?
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- Induction-Hardened Gears: The internal teeth are hardened to resist wear and prevent tooth breakage under high-torque swing loads.
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- Dual-Lip Sealing: Protects the internal ball bearings from dust, mud, and water, extending the service life of the grease and the bearing.
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- Precision Bolt Pattern: Machined to exact tolerances for a perfect bolt-on installation to the track frame and upper revolving frame.
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- High Load Capacity: Designed to absorb the leverage forces during heavy lifting and deep trenching.
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Common Service Items for 3-Ton Class Excavators
When replacing a swing circle, it is best practice to check these related components:
| Part Name | Application | Function |
| Swing Circle | 4606438 | Main Rotation Bearing |
| Swing Pinion Gear | Swing Motor Drive | Drives the Swing Circle |
| Swing Bearing Grease | All Models | Friction Reduction |
| Mounting Bolts | Circle to Frame | Structural Fastening |
| Manifold (Swivel) Seal Kit | Center Joint | Hydraulic Fluid Transfer |
Q&A Section
Q1: How do I know if my 4606438 swing circle is failing?
A: Common signs include excessive "play" or tipping movement when the boom is extended, a loud grinding/popping noise during rotation, or a noticeable "skip" in the gears when swinging.
Q2: Is this part compatible with the John Deere 35G model?
A: While the 35D and 35G are similar, you should verify your serial number. The 4606438 is specifically listed for the 35D and the ZX-3 series.
Q3: How often should I grease the swing circle?
A: Most manufacturers recommend greasing the swing bearing every 50 to 100 operating hours. Use a high-quality EP (Extreme Pressure) lithium grease for the best protection.
About SPARKLING MACHINERY:
- 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.
Get In Touch:
- Replace your failing ECU confidently. Contact SPARKLING for pricing, lead time, and technical support — restore optimal machine control quickly and reliably.
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📦 Packing
1. Packaging methods: Carton box + Wooden case/Pallet + Anti-rust treatment
2. Export-standard packaging to ensure safety during transportation
3. Custom packaging available upon request
4. Dimensions and weight can be provided for freight calculation
🚚 Shipping
1. Available shipping methods: Sea freight, Air freight, Express delivery (DHL, UPS, FedEx, etc.)
2. LCL (Less than Container Load) and FCL (Full Container Load) options are supported
3. For Russian clients, we can introduce the forwarder agent to you
4. Delivery time: Ships within 1-3 working days after payment (for items in stock)
💳 Payment
1. Accepted methods: T/T, Bank Transfer, PayPal, Alipay, WeChat Pay, Western Union
2. Deposit + balance payment available for large or custom orders
3. Flexible payment options—feel free to contact us for details
📌 Frequently Asked Questions (FAQs)
Q: Which excavator models is this part compatible with?
A: This product is compatible with major brands such as CAT, KOMATSU, HITACHI, and more. Custom specifications are also available.
Q: How can I make sure I’m selecting the correct part?
A: You can send us a photo of the old part, part number, or your excavator model, and we will help you confirm the right match.
Q: Is there a warranty for this product?
A: Yes, we offer a 6-month quality guarantee under normal use.
Get a free quote
We are committed to producing the highest quality products at the most competitive prices. Therefore, we sincerely invite all interested companies to contact us for more information.
Contact us
Email: ranroswang@hksparkling.com
Wechat: +86 136 0901 0879
Skype: foreverlucia1
WhatsApp: +86 136 0901 0879
Address: No. 514-515, Hulin Road, Tianhe District, Guangzhou, China.
Sparkling Machinery Co.,Ltd
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Whatsapp: +8613609010879