HYW4000 slewing bearing 3718×4282mm

HYW4000 slewing bearing 3718×4282mm

On a bulk terminal stacker-reclaimer, the boom slews through wind gusts while the bucket wheel digs into stockpiles. The slewing ring between the upper structure and the portal frame sees axial load from the boom weight, radial load from digging resistance, and a tilting moment that reverses with every pass. A bearing this large — the HYW4000 measures 3718 mm inside diameter, 4282 mm outside diameter, and 270 mm in width — is usually selected not as a catalogue default but as a calculated interface component.

Where the HYW4000 suits the duty

The HYW4000 is a three-row cylindrical roller slewing bearing with an external gear. The three rows share axial and radial loads, while the outer ring carries the gear teeth that mesh with the drive pinion. It is a natural fit for slow-slewing, heavy-moment equipment: stacker-reclaimers, ship unloaders, large deck cranes, mining shovels, ladle turrets, and similar bulk-handling machines where the drive is a pinion and the bearing is a structural joint.

This is not a high-speed bearing. It is happiest with intermittent or low-speed slewing, generous lubrication, and a stiff mounting structure. The double seal helps in dusty yards and coastal air, and the plastic or nylon cage reduces weight and friction in the low-speed duty cycle. For comparable large-diameter designs, see the Triple row cylindrical roller combined slewing bearings (External gear type) category.

Operating conditions that make this bearing a good fit

Choose the HYW4000 when several load directions act at once. A stacker-reclaimer may push the boom into a pile while wind loads the structure from the side; a ship unloader may swing a loaded grab while the portal flexes. In those cases, a single-row bearing is a poor compromise. The three-row layout gives the designer more load path options for axial load, radial load, and tilting moment without making the ring section excessively tall.

External gear drive is the other key condition. The pinion position, gear module, tooth count, and backlash must be fixed before ordering. If the application needs very tight angular positioning or low gear runout, specify P6 or P5 rather than defaulting to P0. For dirty, wet, or washdown areas, the double seal is useful but should be backed by a guard and a lubrication plan. High-temperature or high-shock duty needs a separate review because the cage and seal materials must be confirmed.

Load and geometry checks before you order

Do not order from the boundary dimensions alone. A 4282 mm outside diameter leaves little room for error in the mounting interface, and the 6396 kg mass makes rework expensive. Start with the load case: axial load, radial load, tilting moment, static and dynamic factors, and the number of load cycles. Then verify the gear data and the bolt pattern.

Check	HYW4000 data / action
Boundary dimensions	d 3718 mm × D 4282 mm × B 270 mm
Rows and type	Three-row cylindrical roller, external gear
Mass	6396 kg — plan lifting and assembly tooling
Precision	P0, P6, or P5 — match to gear runout and positioning
Sealing	Double seal; add guard in dusty or wet service
Cage	Plastic or nylon — confirm lubricant compatibility
Gear interface	Module, tooth count, pressure angle, backlash, pinion position
Mounting	Bolt circle, hole size, flatness, hardness, and preload

The table is a starting point, not a complete selection. Ask for load curves and the mounting drawing. Check that the foundation flatness and bolt preload are within the bearing maker’s limits; a soft mounting face can distort a large ring and shorten seal life. Also confirm the gear tooth load and the pinion alignment under deflection.

Mounting, lubrication and seal checks

At this size, the bearing is part of the machine structure. Lifting points should be on the ring body, never on the gear teeth. Clean the mounting faces, check flatness with a straightedge and feeler gauge, and confirm bolt-hole alignment before the ring is lowered. Tighten bolts in the specified sequence and preload; uneven clamping is a common cause of running noise and seal leakage.

Lubrication needs to cover both the roller paths and the gear mesh. Grease is common for the bearing, but the gear may need a different lubricant or a controlled film. Confirm relubrication intervals against dust, moisture, and duty cycle. The double seal will not compensate for over-greasing or a blocked relief path. With a plastic or nylon cage, check that the chosen grease and operating temperature are compatible.

Pre-order checklist

• Load case summary: axial, radial, tilting moment, static and dynamic ratings, and cycle profile.
• Interface drawing: bolt circle, hole size, mounting flatness, hardness, and available space for seals.
• Gear data: module, number of teeth, pressure angle, backlash, and pinion alignment.
• Precision grade: P0 for standard duty, P6 or P5 where runout and positioning are tight.
• Lubrication and environment: grease type, relubrication interval, dust, water, and temperature.
• Documentation: material traceability, inspection report, and marking requirements.

Use the bearing number reference to confirm the designation and avoid mixing it with similar large-diameter series. If a drawing calls for a cross-reference, compare dimensions, gear data, and seal arrangement — not just the model string.

Precision, verification and ordering

Precision grade affects runout, gear mesh, and the effort needed to align the drive. P0 is adequate for many slow-slewing machines. P6 or P5 makes sense when the pinion is small, the positioning window is tight, or the structure is sensitive to angular error. Whichever grade you choose, ask for the inspection record and confirm the gear tooth inspection before shipment.

For the HYW4000, the order should include the load case, interface drawing, gear data, precision grade, cage and seal requirements, and lubrication plan. That package lets the factory verify the bearing against the application instead of matching dimensions alone. FIJ Bearing supplies precision slewing rings and can review the interface with you before production.

Request a quote: send your HYW4000 load data and mounting drawing to FIJ Bearing for a selection check and quotation.

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