Slewing Ring Bearing 1540mm Heavy Duty Triple Row for 40 Ton Excavator Swing Circle

1540 mm Heavy Duty Slewing Ring for 40-50 Ton Mining Excavators

At 40 tons and above, the swing circle is a structural part, not an accessory. It carries the weight of the upper structure, the digging reaction and the tilting moment of a fully extended boom, often 20 hours a day. Rings in this class fail from fatigue if the section is too thin, so we build to the heavier end of the standard.

This ring is 1540 mm outside, 1270 mm inside and 150 mm high, with 106 external gear teeth at module 16, 56 mounting holes of 30 mm and a reinforced triple row roller raceway in forged 42CrMo hardened to 58-62 HRC.

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

Specification

Where the Extra Material Goes

• Thicker race section. More wall thickness under the roller path reduces hoop stress under tilting moment.
• Hardened gear flanks. Module 16 teeth are induction hardened after cutting so the pinion wears before the ring does.
• Six grease ports per row. Long shifts and high ambient temperatures need frequent relubrication without disassembly.
• Bolt pattern matched to the carbody. Rings are drilled to the OEM pattern so no reaming is required on site.

Installation and Inspection

Lift only with certified slings on the mounting holes and never through the bore. Check that the carbody face is clean and flat within 0.3 mm before assembly, torque to the OEM value in three passes, and record the gear backlash after the first 100 hours. Mining duty usually calls for a 250 hour grease interval on the race and a 500 hour inspection of the pinion.

Packing and Delivery

Rings ship in a steel framed export crate with VCI film and shock indicators, 620 kg gross. Stock leaves in fifteen working days; production takes thirty-five. Because these rings are machine-specific, send the model, serial number and old ring diameter for confirmation before ordering.

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.