Swing Bearing 1146mm Sealed Internal Gear Assembly for 320D 320C Excavator Slewing

Sealed Swing Bearing for 320D and 320C

Most swing bearing failures we see on 320D machines are not fatigue failures, they are contamination failures. A worn wiper lets fine dust into the roller band, the grease turns into lapping paste, and the ring starts to knock within a few hundred hours. This ring is built to close that path.

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.

It has a triple barrier seal: an outer felt wiper, a lip seal and an internal grease dam. The 50Mn forged race is induction hardened to 57 HRC and the whole assembly is preloaded at 0.05-0.09 mm on our test bench, so the machine does not need shimming after installation.

Technical Data

Selling Points

• Internal gear keeps the pinion protected. On 320D the swing pinion sits inside the ring, so a sealed gear chamber keeps abrasive dust off the tooth flanks.
• Preload set before shipment. Each ring is measured on a three point bench and shipped with a printed preload report.
• Felt wiper replaceable in place. The outer wiper can be renewed with the ring installed, which turns a major repair into a 30 minute service.

Machine Coverage

Ordering and Service

Shipment is in a sealed plywood case with desiccant and shock indicators, 10 working days ex-stock or 25-30 days for production. Each ring carries a 12 month warranty and we hold replacement seals in stock. Send your machine serial and we will confirm the gear and bolt pattern the same day.

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.