R55-5 slewing bearing 572×800mm

R55-5 slewing bearing 572×800mm

A rough swing on an excavator is often the first sign that the turntable bearing is working outside its intended conditions. Vibration, seal weeping, and uneven raceway wear usually trace back to a mismatch between the bearing envelope, the load case, and the contamination level on site. The R55-5, a 572 × 800 × 70 mm excavator slewing ring bearing, is a practical size for turntable assemblies that need a wide mounting footprint without a tall stack-up.

Application fit: where the R55-5 belongs

Listed within our Excavator slewing ring bearings category, the R55-5 is intended for swing and turntable positions on excavators and similar rotating superstructures. Its 572 mm bore and 800 mm outside diameter give engineers room for a robust raceway and seal arrangement while keeping the 70 mm width manageable for existing housing designs.
Use it as a candidate where the machine spends long hours slewing under load, not just where the drawing has space for an 800 mm ring. Digging, lifting, and repeated 90-degree swings put different demands on the bearing than idle rotation, so the duty cycle matters as much as the dimensions.

Operating conditions that reward the double seal

On dusty demolition sites, wet trenching work, or applications with washdown, the double seal is the feature that earns its keep. It helps keep abrasive slurry out of the raceway and holds grease where the rolling elements need it. The R55-5 is rated for -30 ~ 80 °C, so it fits most standard outdoor excavator duties; applications outside that band need a different lubricant and seal review.
A plastic or nylon cage also suits the low-to-moderate speed swing motions typical of excavator turntables, where weight and corrosion resistance matter. It is not a reason to skip lubrication checks, but it is a sensible match for the application.

Specification check before comparing drawings

Use the table below as a quick datum check. It is not a substitute for the mounting drawing, but it catches obvious mismatches early.

Specification	Value
Model number	R55-5
Bearing type	Excavator slewing ring bearings
Boundary dimensions (d × D × B)	572 × 800 × 70 mm
Weight	95 kg
Cage	Plastic or nylon
Precision grade	P0, P6, P5
Sealing	Double seal
Operating temperature	-30 ~ 80 °C
Unit of measurement	Metric

If any value here differs from the machine parts list, stop and verify the replacement route before ordering.

Selection checks: load, mounting, and clearance

Start with the load case: axial load, radial load, and tilting moment must be reviewed together. A bearing that fits the diameter can still be wrong if the tilting moment is higher than the original design allowed. Confirm the mounting bolt pattern, raceway clearance, and mating surface flatness; a distorted housing can shorten seal life even when the bearing itself is correct.
Then check lubrication and access. Grease ports, seal guards, and drainage paths need to remain serviceable after installation. For replacement work, cross-check the R55-5 against your parts manual using our bearing number reference, and compare the old unit’s marking, bolt holes, and seal profile. Precision grade is another decision point: P0, P6, and P5 are all listed for this model, so specify the grade your swing drive actually needs rather than defaulting to the tightest option.

Ordering questions that prevent a costly mismatch

Before requesting a quote, send the machine model, serial number if available, and a photo of the bearing marking. Add the mounting drawing or a sketch of the bolt circle, plus the expected load and swing duty. If the unit has failed, photos of the seal lip, grease condition, and raceway can help separate a bearing issue from a contamination or alignment problem.
Also confirm the operating temperature range and whether the machine sees high-pressure washdown or fine abrasive dust. Those details decide whether the standard double seal and cage configuration is appropriate for the R55-5 in your application.

Confirm the R55-5 before you commit

The R55-5 is a straightforward choice when the dimensions, load envelope, and sealing needs line up with the turntable design. The risk is treating it as a generic 572 × 800 × 70 mm ring and skipping the application checks. Review the mounting interface, load case, lubrication, and precision grade together, then order with confidence.
FIJ Bearing supplies this model for excavator slewing ring bearing replacement and project builds. For a fit check, drawing review, or current lead time, contact our team through FIJ Bearing.
Request a quote from FIJ for this excavator slewing ring bearing and include your mounting drawing for a faster review.

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