CAT70B slewing bearing 585×810mm

CAT70B slewing bearing 585×810mm

What the 585 × 810 × 84 mm Envelope Tells You

CAT70B is an excavator slewing ring bearing with a 585 mm bore, 810 mm outside diameter and 84 mm axial height. In practice, the 585 mm bore sets the mounting diameter around the machine’s center post; the 810 mm outside diameter fixes the available housing and bolt-circle envelope; and the 84 mm height affects stack-up, seal clearance and cap design. These are not interchangeable with “close” sizes: a few millimeters can change raceway load distribution and bolt preload.

The bearing uses a plastic or nylon cage, double seals and metric dimensions. It is rated for -30 to 80 °C. Precision options are P0, P6 and P5.

Applications and Operating Conditions That Suit CAT70B

This size suits excavator swing applications where the upper structure rotates slowly under combined axial, radial and tilting-moment loads. It can also be considered for similar low-speed slewing duties in material handling or attachment systems when the load curve and mounting interface match. The double seal helps in dusty, wet or muddy sites, but it is not a substitute for correct lubrication and re-greasing intervals.

Use CAT70B for controlled slewing, not high-speed continuous rotation. Check shock loads during digging, travel over rough ground and sudden stop/start cycles. The nylon cage is generally adequate for the intended oscillating motion, provided operating temperature stays inside the stated range. For very low-temperature starts or hot hydraulic environments, confirm the actual seal and grease limits.

Shortlist matching sizes in our Excavator slewing ring bearings category before comparing drawings.

Selection Checks: Load, Fit and Environment

A dimensional match is only the first check. The table below condenses the practical points buyers and maintenance engineers should confirm before release.

Check	Confirm	Why it matters
Mounting pattern	Bolt circle, hole count, flange thickness and clearance around the 810 mm OD	Prevents interference and uneven bolt preload
Load curve	Axial, radial and tilting-moment ratings for your worst digging or lifting case	Dimensional fit alone does not prove capacity
Sealing and grease	Double-seal condition, grease type and re-lubrication interval	Dust and water ingress shorten raceway life
Precision grade	P0, P6 or P5 selected against housing stiffness and backlash needs	Higher grade must match the surrounding structure

If the machine has been modified, measure the actual mounting flange, bolt hole positions, and available axial clearance rather than relying only on the OE drawing. Also confirm whether the old bearing had a gear, special holes or a locating step not shown in the basic d × D × B data.

Pre-Order Verification to Avoid Rework

Before ordering CAT70B, verify the raceway mounting surfaces are flat and clean, the bolt threads are in good condition, and the seal counterface is not worn. Ask for the load curve and clearance data for the exact precision grade. P5 is tighter than P6 and P0, but a higher grade is only useful if the housing and shaft seats can support it.

Use our bearing number reference to cross-check the model format, then confirm the drawing revision, seal type and cage material. For dusty sites, confirm grease type and re-lubrication interval. For cold stores or winter work, check that the grease remains pumpable at the lower end of the -30 °C limit.

Ordering CAT70B with Confidence

CAT70B is a large-envelope excavator slewing ring bearing, so the cost of a wrong fit is high. Send the machine model, mounting drawing, load conditions and old bearing photos to FIJ Bearing for a practical review. We can confirm the FIJ option against your application before you commit.

Request a quote: contact FIJ with your CAT70B quantity, precision grade and delivery target.

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