Swing Bearing for Caterpillar 330B — Internal Gear

The Heavy-Duty Swing Bearing for Large Caterpillar Excavators is a heavy-load rotary support component specially developed for CAT 30–60 ton large mining & construction excavators. This reinforced single-row ball internal slewing bearing delivers ultra-stable 360° full rotation, withstands extreme overturning moment, heavy axial/radial impact loads, and keeps long service life under severe mine, quarry and heavy earthmoving conditions. Made by BRISK SLEWING, this large internal gear swing bearing strictly follows CAT OEM heavy-duty standards on dimension, forging material and deep heat treatment, supporting direct replacement without any structural modification. It is designed for all heavy-load working scenarios including mine loading, large-scale demolition and mass earthmoving. Our heavy swing bearing greatly cuts machine repair frequency and delivers a cost-effective alternative to original CAT heavy parts without sacrificing structural strength and operational safety.

The heavy internal gear swing bearing for CAT 30–60 ton large excavators adopts reinforced heavy-duty parameters:

Outer Diameter: 1620 mm; Inner Diameter: 1310 mm; Overall Height: 102 mm;

Gear Type: Internal gear (standard); Number of Teeth: 124; Module: 12;

Material: Thick-wall forged 42CrMo alloy steel, full quenched & tempered;

Raceway Hardness: HRC 56–63; Gear Surface Hardness: HRC 52–60;

Sealing: Triple lip NBR dust-proof seal, Viton high-temperature resistant seal optional for mining high-heat environment;

Lubrication: M12×1 grease nipple with wide deep grease circulation groove;

Precision Class: Grade P5 (ISO 286);

Dynamic Load Rating (axial): 1600 kN; Static Load Rating (axial): 4200 kN.

Reinforced structural design copes with continuous heavy impact and large swing torque of large excavators. Every heavy bearing passes full strict inspection including load simulation test before delivery.

This heavy internal gear slewing ring is direct OEM replacement for CAT large excavators over 30 tons:

CAT 330B, 330C, 345, 345B, 345CL, 324D, 325D.

The mounting hole uses M30 grade 10.9 super high strength bolts with tightening torque of 1650 Nm. Our official installation manual clearly marks the soft annealing zone, which must be placed on the zero-load idle sector during assembly. We recommend measuring your original bearing outer diameter, inner diameter and overall height before placing orders to avoid mismatching.

4. Quality Standards & Certification

BRISK SLEWING operates under ISO 9001:2025 quality management system. Each swing bearing undergoes a multi-step quality control process: Raw material verification – chemical composition analysis and ultrasonic testing for internal defects; Forging and heat treatment – controlled quenching & tempering to achieve uniform hardness; Machining – CNC turning and grinding of raceways with surface roughness ≤ Ra 0.8; Gear cutting – hobbing or shaping followed by induction hardening of tooth flanks; Magnetic particle inspection – 100% inspection of raceways and gear teeth for cracks; Dimensional inspection – CMM measurement of all critical dimensions; Noise and rotation test – smoothness verification under load simulation. All test reports and material certificates are kept traceable and can be provided upon request. We also offer third-party inspection by SGS, BV, or TÜV at the buyer's expense.

CAT large excavator heavy swing bearing undertakes ultra-heavy rotary work in harsh sites:

Open-pit mining & quarrying – continuous high-load rock loading, abrasive dusty environment;

Large-scale earthmoving & highway construction – long-cycle full-load swing with heavy buckets;

Heavy demolition & scrap recycling – severe impact from large hydraulic breakers;

Port bulk cargo handling – long-hour uninterrupted material stacking and loading;

Hydropower & foundation giant construction – heavy rock excavation and piling auxiliary work.

This heavy internal gear bearing series also matches large crawler cranes and heavy industrial turntables. Reinforced lubrication structure extends maintenance intervals for heavy-duty continuous rotation.

13+ Years of Experience – We have been manufacturing slewing rings since 2013, specializing in replacement parts for CAT, Komatsu, Hitachi, and other major brands. Our engineering team understands the unique failure modes of each model.

500+ Technical Drawings – We maintain a library of CAD drawings covering most popular excavator and crane models. You can request a free 2D drawing for verification before ordering.

Global Shipping & Logistics – We ship to over 60 countries via sea, air, or rail. Our logistics partners provide door-to-door delivery with customs clearance support. Average lead time to South America, Africa, and Southeast Asia is 15-25 days.

24-Hour Quick Response – Send us an inquiry with your machine model or OEM number. You will receive a quote within 24 hours, along with technical advice from our engineers.

OEM-Grade Quality at Lower Cost – Our bearings meet or exceed OEM specifications but cost 30-40% less. We offer a 12-month warranty against manufacturing defects.

Customization Available – Non-standard sizes, special seals (e.g. Viton for high temperature), and alternative gear configurations are available. We also accept OEM branding and neutral packaging.

Free Technical Support – We provide installation guides, bolt torque charts, and online remote assistance. For large orders, we can arrange on-site training.

📖 Technical Guide: Read our Installation Guide for Large CAT Heavy Swing Bearing → for bolt torque specifications, soft zone placement, and maintenance tips.

Frequently Asked Questions

1. What is the OEM part number for CAT large excavator swing bearing?

− Different CAT 330/345 series large diggers have exclusive OEM part numbers. Provide your exact machine model, and we will match the corresponding heavy-duty SE-series large slewing bearing, fully consistent with original heavy-duty alloy material and deep quenching process for direct installation.

2. Is this heavy internal gear slewing ring a direct replacement for CAT 30–60Ton large excavators?

− Yes, BRISK SLEWING heavy swing bearing is tailor-made OEM replacement for CAT 330B/C, 345B/CL, 324D, 325D large excavators. Mounting specification adopts M30 grade 10.9 bolts with tightening torque 1650 Nm. Always measure original bearing dimensions before purchase.

3. What material and hardness grade are used for this heavy swing bearing?

− The heavy slewing ring is made of thick-wall forged 42CrMo alloy steel, fully quenched and tempered to reach raceway hardness HRC 56–63 and gear surface hardness HRC 52–60. Precision Grade P5 (ISO 286) ensures stable rotation under extreme heavy mining loads.

4. What is the warranty period and do you provide technical drawings?

− BRISK SLEWING offers a 12-month warranty against manufacturing defects on all swing bearings. Yes, we maintain a library of 500+ CAD drawings covering most excavator and crane models. You can request a free 2D drawing for verification before ordering. Simply send us your machine model or OEM number, and our engineering team will provide the drawing within 24 hours.

5. How long does shipping take and which countries do you deliver to?

− We ship to over 60 countries worldwide via sea, air, or rail. Our logistics partners provide door-to-door delivery with customs clearance support. Average lead time to South America, Africa, and Southeast Asia is 15–25 days. For urgent orders, express air shipping is available. Contact our sales team for a precise delivery quote based on your location.