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T: +86-13955534080
E: salesb@masfy.com
E: salesb@masfy.com
West ChaoShan Road, Economic and Technical Development Zone, Maanshan,Anhui,China
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Developed for the harsh, high-impact working conditions of construction sites, this excavator slewing bearing delivers stable rotational support, reliable torque transmission, and long-term fatigue resistance for equipment upper structure slewing systems. It is the preferred OEM supporting and replacement component for professional construction machinery manufacturers, engineering project operators, and industrial equipment after-sales service providers, with full compliance with national construction machinery industry standards.
Parameter Category | Core Technical Data |
Product Model | QNA730.22Z19 |
Net Product Weight | 95Kg |
Rolling Element Specification | SΦ22.225mm, G40 Grade Precision Steel Balls |
Gear Core Parameters | Module 7, Teeth Number 90, Profile Shift Coefficient +0.4, Pressure Angle 20°, Reference Diameter Φ630mm |
Mounting Hole Arrangement | 24 × Φ18 evenly distributed mounting holes |
Axial & Radial Clearance | 0.06～0.20mm |
Runout Control | Axial Runout ≤0.15mm, Gear Radial Runout ≤0.40mm |
Locating Pin Configuration | 2 × Φ12H8 precision locating pins |
Gear Accuracy Grade | Grade 11 (GB/T 10095) |
Raceway Hardening Performance | 55-62HRC Surface Hardness, Hardened Layer Depth ≥2.7mm (HRC48) |
Tooth Hardening Performance | 50-60HRC Surface Hardness, Tooth Surface Hardened Layer ≥1.5mm (HRC45), Tooth Root Hardened Layer ≥0.8mm (HRC45) |
The construction machinery slewing ring adopts a four-point contact ball raceway design, which can simultaneously bear axial load, radial load, and overturning moment generated during excavator operation, fully adapting to variable load and impact conditions of earthwork and municipal construction.
Integral induction hardening treatment for raceway and tooth surface achieves industry-leading hardness and hardened layer depth, effectively resisting wear, pitting and fatigue failure under long-term heavy load, greatly reducing equipment downtime and maintenance costs.
Strict tolerance control for clearance and runout, matched with G40 grade precision steel balls, ensures smooth slewing of the excavator upper structure, improves operation accuracy of the working device, and reduces vibration and noise during operation.
This 6-ton excavator slewing ring is primarily designed for 6-ton class crawler and wheeled hydraulic excavators, and is also compatible with 5-7 ton compact construction equipment, including small earthmoving machinery, municipal engineering equipment, landscaping machinery, and small lifting equipment.
Before installation, confirm the flatness and cleanliness of the mounting surface, and use matching Φ12H8 locating pins to ensure accurate positioning;
Tighten mounting bolts evenly in a diagonal sequence to avoid uneven stress and deformation;
Fill with specified lithium-based grease before initial operation, and replenish grease every 100 working hours;
Regularly check clearance, seal integrity and bolt tightness, and avoid long-term overload operation beyond the rated range.
We provide tailored customization services for professional machinery manufacturers and bulk industrial purchasers, including adjustment of mounting hole size and position, optimization of gear parameters, material and surface treatment upgrade, and special working condition adaptation. For bulk OEM supporting and wholesale procurement, we offer stable delivery cycles, exclusive technical support, competitive bulk pricing, and full quality inspection reports for each batch.
Under normal operation and standard maintenance, the designed service life of the QNA730.22Z19 slewing ring reaches 8000-10000 working hours, which can be further extended with standardized maintenance.
Yes, it can be adapted to 5-7 ton compact construction machinery with matching mounting dimensions and load requirements, and we can provide customized modifications for non-standard equipment.
We recommend using NLGI 2 grade extreme pressure lithium-based grease, which adapts to the wide temperature range and heavy load conditions of construction sites.
+86-13955534080 
