20-ton Slewing Bearing for Excavator QND1220-32Z7-CZ

Overview

Built to withstand extreme load impacts, harsh working environments, and long-term continuous operation, it delivers exceptional torsional rigidity, stable rotational performance, and ultra-long service life for heavy earthmoving and construction tasks. It is the preferred OEM supporting component and high-quality replacement part for heavy equipment manufacturers, large construction fleet operators, and professional mining & earthmoving equipment service providers. Its reinforced heavy-load structure perfectly adapts to the high-strength operation requirements of 20-ton excavators, ensuring reliable performance in the most demanding job sites.

Technical Specifications & Dimensional Parameters

Key Features & Performance Advantages

Super Heavy Load & Impact Resistance

This heavy duty excavator slewing bearing adopts a reinforced structure with large-diameter high-strength steel balls, delivering exceptional axial, radial, and tilting moment load capacity to cope with extreme impact loads during heavy earthmoving, rock breaking, and lifting operations. Strictly controlled 0.08～0.20mm clearance ensures uniform load distribution even under full-load continuous operation of the 20-ton excavator slewing ring.

Deep Hardening Treatment for Extreme Durability

The raceway of this QND1220-32Z7-CZ slewing bearing adopts deep induction hardening technology, reaching 55-62HRC hardness with a ≥3.6mm hardened layer. The tooth surface and root are fully hardened, providing outstanding wear, fatigue, and impact resistance, greatly extending service life in harsh mining and construction environments.

High Rigidity Anti-Deformation Design

With a 275Kg integral forged structure, this medium construction machinery slewing bearing has excellent torsional rigidity and anti-deformation performance, effectively resisting structural deformation under long-term heavy load and uneven stress. Grade 11 tooth profile accuracy ensures smooth meshing, low transmission loss, and stable slewing during high-torque operations.

Applications & Compatible Equipment

This 20-ton excavator swing bearing is specially developed for 20-ton class medium hydraulic excavators, and is also widely compatible with heavy construction equipment including large wheel loaders, crawler cranes, mining transport machinery, port handling equipment, and large-scale foundation construction machinery. It is suitable for high-strength operation scenarios such as highway construction, mine development, urban demolition, water conservancy projects, and large-scale earthmoving works.

Installation, Operation & Maintenance Guidelines

Before installation, inspect the flatness and rigidity of the mounting base, and remove all welding slag, dust, and impurities. Tighten the 36-M20-7H bolts in a diagonal sequence with a professional torque wrench to ensure uniform stress distribution. Fill with extreme pressure lithium-based grease before initial operation, replenish grease every 50 working hours in harsh environments, and perform a full inspection and lubricant replacement every 12 months. Conduct daily checks of bolt tightness, abnormal noise, and lubrication status to maintain optimal performance of the heavy duty slewing bearing.

Customization & Bulk Procurement Solutions

We provide professional custom heavy duty slewing bearing solutions for heavy equipment OEMs, large-scale construction enterprises, and national machinery parts distributors, including non-standard gear modification, anti-wear/anti-corrosion treatment, high-temperature material upgrading, and special structural design. For bulk procurement, we offer stable mass production capacity, priority delivery schedules, exclusive bulk pricing, and customized after-sales systems to support long-term business cooperation.

FAQs About Slewing Bearing

Is this 20-ton slewing bearing compatible with mainstream excavator brands?

Yes, it fits most mainstream 20-ton medium excavator models, and can be customized to match the installation dimensions of specific brand equipment.

What is the expected service life of this heavy duty slewing bearing?

Under normal use and standard maintenance, the service life reaches 8000-10000 working hours, with a 12-month standard warranty from delivery.

What is the lead time for bulk orders?

Standard bulk orders have a 20-25 working day lead time, while custom bulk orders are completed within 35 working days based on technical requirements.