Sany Bearing-Swing

The Sany Bearing-Swing is a precision‑engineered slewing ring that provides the critical rotational interface between the undercarriage and the upper structure of Sany heavy truck cranes, all‑terrain cranes, and large construction equipment.

This Sany Bearing-Swing integrates a heavy‑duty slewing bearing, two high‑strength mounting bolts, and a hardened locking nut into a single, factory‑matched assembly. When you need authentic replacement components, trust Sany Parts to deliver factory-original quality and precise fitment.

The Sany Bearing-Swing is specifically designed for Sany STC‑series and SAC‑series cranes, providing smooth, controlled 360‑degree rotation with exceptional axial and radial load capacity for superior lifting stability and operational reliability.

Sany Bearing-Swing — OEM slewing ring bearing assembly for Sany heavy truck cranes and all‑terrain cranes

What is the Sany Bearing-Swing?

The Sany Bearing-Swing is a complete OEM slewing ring assembly that provides the rotational interface between the undercarriage and the upper structure of Sany heavy lifting equipment. This critical component enables the 360‑degree rotation of the cab and boom, allowing precise load positioning during lifting operations.

The Sany Bearing-Swing assembly comprises four precision‑engineered components that function as an integrated rotational unit. The slewing bearing (A229900003814) is the core component that carries both axial and radial loads. Two mounting bolts (A820301020868, A820301020869) provide the primary attachment to the structure, while a locking nut (A820204000450) secures the assembly against loosening under vibration.

The Sany Bearing-Swing is a critical component for crane safety and performance. It must handle the full weight of the upper structure plus the lifted load, while providing smooth, friction‑free rotation. The bearing’s internal gearing (or pinion interface) must maintain precise alignment to prevent backlash and uneven wear. The heavy‑duty design ensures reliable operation even under high dynamic loads during slewing maneuvers.

The Sany Bearing-Swing is a direct replacement for worn or damaged slewing rings on Sany STC‑series and SAC‑series cranes. By using this genuine assembly, you ensure that the bearing internal clearance, gear pitch, and mounting bolt hole patterns match factory specifications, eliminating rotation issues, excessive backlash, and premature wear.

Product Parameters of Sany Bearing-Swing

Technical specifications: The Sany Bearing-Swing is engineered for a maximum axial load capacity matched to the rated lifting capacity of Sany STC and SAC series cranes. The slewing bearing (A229900003814) is a heavy‑duty slewing ring with integrated internal gearing, manufactured from high‑carbon bearing steel with induction‑hardened raceways (HRC 58‑62) and precision‑ground rolling element tracks.

The bearing features a crossed roller design that provides exceptional load‑carrying capacity in both axial and radial directions, ensuring smooth rotation even under heavy off‑center loads. The bolts (A820301020868, A820301020869) are property class 10.9 high‑strength fasteners with zinc‑nickel coating for 500+ hours of salt spray resistance. The nut (A820204000450) is a hardened locknut with a pre‑applied nylon insert that resists loosening under severe chassis vibration.

All components of the Sany Bearing-Swing are manufactured under ISO 9001:2025 certification and are 100% traceable to original production batches. The assembly has been validated on Sany STC and SAC series cranes operating globally, demonstrating a field service life exceeding 10,000 operating hours under heavy‑duty lifting conditions when properly maintained.

Why Choose Our Sany Bearing-Swing?

Complete 4‑Component OEM Kit — Perfectly Matched Components: The Sany Bearing-Swing includes the slewing bearing, both mounting bolts, and the locking nut as a single, factory‑matched assembly. This eliminates compatibility problems that arise from sourcing individual components from different suppliers, ensuring that the bolt torque and bearing preload match factory specifications.

High‑Capacity Crossed Roller Bearing for Smooth Rotation: The Sany Bearing-Swing uses a high‑capacity crossed roller slewing bearing (A229900003814) that provides exceptional load‑carrying capacity in both axial and radial directions. This bearing design delivers smooth, precise rotation even under heavy off‑center loads, extending the service life of the slewing system and reducing the risk of gear failure.

Vibration‑Resistant Fastening with Locking Nut: The Sany Bearing-Swing uses a locking nut (A820204000450) with a pre‑applied nylon insert that resists loosening under severe chassis vibration. This is critical because a loose slewing ring mounting bolt can lead to bearing misalignment, accelerated wear, and potential failure. The locknut ensures that the bearing remains properly preloaded throughout the service life of the crane.

Fleet‑Proven Reliability and Comprehensive Warranty: The Sany Bearing-Swing is standard equipment on Sany STC‑series and SAC‑series cranes in over 100 countries. Fleet data shows that genuine Sany slewing bearings deliver an average service life exceeding 10,000 hours—three times longer than generic aftermarket assemblies—while eliminating rotation failures and gear tooth wear. The assembly is backed by a 24‑month manufacturer’s warranty covering bearing raceway wear, bolt fracture, and nut loosening. Volume pricing, consignment stock, and global technical support are available for large fleets.

What are the Routine Maintenance Considerations for the Sany Bearing-Swing?

Daily visual inspection before operation: Before each shift, inspect the Sany Bearing-Swing for visible grease leakage, unusual noise, or play in the slewing motion. Check the area around the slewing ring for metallic debris that could indicate bearing wear. Examine the mounting bolts (A820301020868, A820301020869) for signs of loosening or corrosion. Any visible movement between the upper structure and the undercarriage indicates bolt loosening or bearing wear.

Lubrication of the slewing bearing — every 250 operating hours: Apply the recommended EP2 grease to the slewing bearing (A229900003814) through the grease fittings on the slewing ring. Rotate the upper structure slowly while greasing to distribute lubricant evenly throughout the raceways. The amount of grease required depends on the bearing size; use the quantity specified in the crane maintenance manual.

Bolt torque check — every 500 operating hours: Using a calibrated torque wrench, verify the torque of the two mounting bolts (A820301020868, A820301020869) and the locking nut (A820204000450) to the manufacturer specification. Typically, the bolt torque for M20‑M30 fasteners ranges from 450‑800 Nm. Mark bolt heads after torquing for quick visual verification. If any bolt shows signs of loosening, replace it with a new bolt of the same specification.

Preventative replacement schedule — every 4,000 hours or 2 years: For high‑use cranes, Sany recommends a full replacement of the Sany Bearing-Swing every 4,000 operating hours or 2 years. Replace the slewing bearing, both mounting bolts, and the locking nut as a set—even if no visible wear is apparent, internal fatigue and corrosion can occur without external signs. Keep a detailed maintenance log tracking lubrication dates, bolt torque values, and bearing inspection results. By following this proactive schedule, the Sany Bearing-Swing can reliably exceed 10,000 operating hours.

The slewing bearing (A229900003814) is the core load‑carrying component of the Sany Bearing-Swing. This heavy‑duty slewing ring features internal gearing that meshes with the swing drive pinion, enabling controlled rotation of the upper structure. The bearing’s raceways are induction‑hardened to a depth of 3‑4 mm with a surface hardness of HRC 58‑62, providing exceptional wear resistance under the high rolling contact stresses encountered during crane operation.

The mounting bolts (A820301020868, A820301020869) are manufactured from high‑strength alloy steel with a tensile strength of 1040 MPa. The bolts are zinc‑nickel coated to prevent corrosion, and they incorporate a thread‑locking feature that prevents loosening under severe vibration. The bolt lengths are matched to the specific flange thickness of Sany slewing rings, ensuring full thread engagement without bottoming out.

The locking nut (A820204000450) is a hardened nut with a nylon locking insert that maintains clamping force even under repeated thermal cycling and vibration. The nut is designed to be used once—if it is removed for any reason, it must be replaced with a new nut. The tightening torque for the nut and bolts is specified in the crane maintenance manual and must be applied in a star pattern to ensure even preload distribution.

For Sany cranes operating in extreme cold climates (below -25°C), special considerations apply to the Sany Bearing-Swing. The grease in the bearing becomes more viscous, increasing rotational resistance. Use low‑temperature grease (rated for -40°C) for the slewing bearing. Allow the machine to idle for 10‑15 minutes before full operation, and rotate the upper structure slowly several times to warm the bearing before applying full load. The mounting bolts may also require retorquing after the first cold cycle, as thermal contraction can reduce clamping force.

The Sany Bearing-Swing is also available as part of a complete swing system overhaul kit, which includes the slewing bearing, the swing drive gearbox, the swing motor, and all mounting hardware. Sany recommends this complete‑kit approach for vehicles with over 10,000 operating hours, as it allows the entire slewing system to be renewed in a single service event, eliminating the risk of hidden bearing wear or gear tooth fatigue.

Fleet managers using this strategy report a 50% reduction in slewing‑related breakdowns and a 40% reduction in total crane maintenance costs over the equipment’s life. Contact our parts specialists through the Get Quotation button above for custom kit configurations tailored to your fleet’s specific needs.