Slewing Ring Bearing 1180mm OD 20A-25-00110 Swing Circle for Komatsu PC200-8 PC210-8 Excavator

Direct Fit Slewing Ring for Komatsu PC200-8 and PC210-8

The swing circle is the single most loaded bearing on a 20-ton excavator. Ours is built as a bolt-on replacement for part number 20A-25-00110, so the machine goes back to work without adapter plates, machining or a second lift.

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.

Each ring is forged from 20CrMnTi, rough machined, induction hardened to 55-58 HRC on the raceway and gear teeth, then finish ground on a vertical grinder to keep runout inside 0.08 mm. The triple row roller arrangement carries radial, axial and tilting loads in one unit, which is why excavator OEMs use this layout rather than a single row.

Specifications

Why This Ring Holds Its Preload

• Ground, not just turned. Raceway flatness is checked on a granite table; a turned-only race loses preload within 800 hours and starts to knock.
• Sealed on both sides. Dual lip seals with a grease channel keep grit out of the roller band, the usual cause of swing backlash on dusty sites.
• Bolted and torqued at the factory. Rings ship assembled with matched spacers, so the installer only torques the mounting bolts to 480 Nm in a cross pattern.

Fitment and Interchange

Fits Komatsu PC200-8, PC200LC-8, PC210-8, PC210LC-8 and PC200-8M0. Cross references include 20A-25-00111, 20A-25-00112 and several aftermarket numbers used on the same swing frame. Send us your machine serial number and we will confirm the gear tooth count before shipping.

Packing and Shipment

Tell us the model and serial number and we will confirm the tooth count, bolt pattern and grease port position before the ring leaves Guangzhou. Sample rings for workshop trials are available from one piece.

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.