Swing Circle Bearing 1098mm 42CrMo Forged Race for Hitachi ZX200-3 ZX210-3 Excavator Slewing

ZX200-3 Swing Circle Built for Hard Rock Duty

Hitachi ZX200-3 and ZX210-3 machines working in quarry and demolition duty load the swing circle differently from a digging machine: shock loads arrive through the bucket and travel straight into the roller band. Our ring is made from 42CrMo quenched and tempered to 280-320 HB, a tougher base than the case-hardened rings often sold as equivalents.

Talk to our engineer on WhatsApp: +86 180 2625 4557 — send your machine model and serial number, and we confirm fitment the same working day.

The ring measures 1098 mm outside, 890 mm inside and 105 mm high, carries 82 external gear teeth at module 12 and mounts through 36 holes of 20 mm. It is a direct replacement for the OEM swing circle on standard ZX200-3 and ZX210-3 frames.

Specifications

Design Points That Matter in Service

• Tough core, hard surface. Quenched and tempered 42CrMo resists the shock loading that cracks shallow case-hardened rings.
• Grease path drilled through the race. Each ring has four grease ports feeding the roller band directly, so a single grease gun service reaches every roller.
• Matched gear set. The ring is lapped against our swing pinion so tooth contact stays above 70 percent across the face.

Interchange and Fitment Notes

Because Hitachi changed the swing frame between series, always confirm with the machine serial number. Send us a photo of the old ring with a tape measure across the outer diameter and we will identify it within one working day.

Delivery

Stock rings leave Guangzhou in 7 working days in a strapped plywood case with VCI film; production batches take 22-28 days. Warranty is 12 months against raceway spalling under normal grease intervals.

Workshop and Production Capability

Every ring is machined, gear cut, induction hardened and ground in our Guangzhou workshop, then assembled, greased and preload checked on a three point bench before packing. The photos below show the production floor and inspection area that support this series.