The excavator is a large, diesel-powered construction machine made for digging out earth with its bucket to create trenches, holes and foundations. It’s a staple of large construction jobsites.

Excavators are designed to handle many different types of jobs; so, they come in a range of sizes. The most common excavator types are crawlers, dragline excavators, suction excavators, skid steer, and long reach excavators.

Excavators use a variety of hydraulic attachments that serve different purposes. In addition to a bucket, other common attachments include an auger, breaker, grapple, auger, lamp, and quick coupler,the most import parts is slewing bearing.

The excavator can rotate left and right during work, and cannot do without the slewing bearing. The slewing bearing is an important part of the slewing mechanism. The excavator slewing bearing is mainly used to support the mass of the upper car body and bear the working load.
The slewing bearing of the excavator mostly adopts internal gear type single row four-point slewing bearing when contacting the ball, and adopts tooth quenching