1.8-ton Swing Bearing for Mini Excavator QNB400-18

Overview

Tailored to the strict demands of compact equipment operation, it delivers stable rotational performance, high load resistance, and long service life in tight working environments. It is the ideal OEM supporting part and premium replacement option for industrial equipment manufacturers, regional construction machinery parts distributors, and professional excavator repair service providers. Its compact structure and optimized gear configuration perfectly adapt to the limited installation space of small excavators, ensuring smooth and reliable slewing during continuous operation.

Technical Specifications & Dimensional Parameters

Key Features & Performance Advantages

Ultra-High Precision Machining for Stable Operation

This mini excavator slewing bearing adopts precision grinding technology, with strict clearance control within 0.04～0.10mm to minimize runout during high-frequency slewing. Grade 11 tooth profile accuracy ensures smooth meshing, low noise, and consistent transmission efficiency for the 1.8-ton excavator slewing ring.

Premium Hardening Treatment for Extended Service Life

The raceway undergoes integral induction hardening (55-62HRC) with a ≥2.5mm hardened layer, while the tooth surface and root are precision hardened for exceptional wear and impact resistance. This design greatly extends the service life of the QNB400.18 slewing bearing under continuous cyclic operation.

Compact Optimized Design for Small Equipment

With a lightweight 22Kg structure and optimized mounting layout, this small construction machinery slewing bearing fits perfectly into the limited space of 1.8-ton mini excavators. G40 grade high-precision steel balls ensure uniform load distribution, reducing equipment vibration and improving whole-machine stability.

Applications & Compatible Equipment

This 1.8-ton excavator swing bearing is primarily designed for 1.8-ton class mini hydraulic excavators, and is also compatible with light construction equipment including small wheel loaders, compact garden machinery, municipal micro-digging equipment, and small aerial work platforms. It is ideal for narrow-space operations such as indoor demolition, garden landscaping, municipal pipe maintenance, and farmland construction.

Installation, Operation & Maintenance Guidelines

Before installation, confirm the flatness of the mounting surface and clean all impurities. Use the 2×Φ13H8 locating pins for precise positioning, and tighten the 20-M12-7H bolts evenly with a calibrated torque wrench to avoid uneven stress. Lubricate with high-quality lithium-based grease before initial operation, replenish grease every 100 working hours, and replace lubricant completely every 6 months. Conduct regular inspections of bolt tightness, gear meshing, and abnormal noise to ensure long-term stable performance of the excavator slewing bearing.

Customization & Bulk Procurement Solutions

We provide targeted custom slewing bearing for mini excavators solutions for industrial equipment manufacturers and professional parts distributors, including mounting hole adjustment, gear parameter modification, material upgrading, and anti-corrosion treatment. For bulk procurement, we offer flexible MOQ settings, stable lead times, exclusive price discounts, and long-term quality assurance to support your business growth.

FAQs About QNB400.18 Slewing Bearing

What models is this 1.8-ton slewing bearing compatible with?

It fits mainstream 1.8-ton mini excavator models on the market, and can be customized to match specific OEM equipment dimensions.

What is the warranty period for this slewing bearing?

We offer a 12-month standard warranty, with extended warranty options available for bulk procurement partners.

What is the lead time for orders?

Standard bulk orders have a 15-20 working day lead time, while custom orders are usually completed within 25-30 working days.