7Y4270 Separable Cylindrical Roller Bearing for Caterpillar Excavator Swing Motor E325B E330B E350 E375 Replacement Construction Machinery Spare Parts

Name: 7Y4270 Separable Cylindrical Roller Bearing for Caterpillar Excavator Swing Motor E325B E330B E350 E375 Replacement Construction Machinery Spare Parts
Brand: GLOBALMACHEX
SKU: 7Y4270
Availability: InStock
Rating: 5 (1 reviews)

7Y4270 separable cylindrical roller bearing is a dedicated replacement spare part for swing motors of Caterpillar excavators E325B, E330B, E350 and E375. It is precisely forged and machined from high-hardness bearing steel with optional P0/P6/P5 precision grades. The split separable inner and outer ring structure enables easy disassembly and maintenance. The line-contact cylindrical roller structure withstands ultra-heavy radial loads with excellent impact and wear resistance, adapting to dusty harsh working conditions with continuous alternating impact of excavator swing mechanism in mines and construction sites. It can directly match OEM swing motor assemblies for installation, serving as core durable bearings for swing motor maintenance & overhaul of Caterpillar series excavators.

$17.44

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ZHZB Bearing （Guangzhou）Co., Ltd.

Main Products: Excavator bearings, bulldozer bearings, loader bearings, dump truck bearings, deep groove ball bearings, tapered roller bearings, spherical roller bearings, cylindrical roller bearings, joint bearings, cross bearings, needle roller bearings, insert bearin

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Year Established Established in 2017

Main Products Excavator bearings, bulldozer bearings, loader bearings, dump truck bearings, deep groove ball bearings, tapered roller bearings, spherical roller bearings, cylindrical roller bearings, joint bearings, cross bearings, needle roller bearings, insert bearin

Employees Less than 50 People

Factory Area 1,000-5,000 m²

Annual Revenue Above US$50 Million

Main Markets Europe / Southeast Asia / Africa

Details

Specifications

Trade Information

1. Product Overview

7Y4270 cylindrical roller bearing is specially matched for swing motors of Caterpillar E325B, E330B, E350 and E375 excavators, manufactured fully compliant with Caterpillar OEM drawing dimensions. The complete set adopts three-piece split separable structure including inner ring, roller cage and outer ring. It is installed on heavy-load support positions of hydraulic transmission for excavator swing motors. It stably buffers high-frequency alternating radial impact loads during 360-degree continuous rotation and excavation impact work of excavators. The split separable structure avoids disassembling the complete swing motor housing, allowing separate replacement of worn damaged inner ring, outer ring or roller assemblies during maintenance, which greatly reduces excavator maintenance downtime and operation losses of mines and construction sites.

2. Material & Processing Advantages

Bearing Base Material: Integrally forged from premium high-carbon chromium bearing steel with complete quenching and tempering heat treatment. Uniform hardness and stable metallurgical structure of rollers and raceways deliver excellent resistance to fatigue, pitting and surface spalling, capable of enduring continuous alternating heavy impact loads of excavator swing mechanism.
Cylindrical Roller Load Structure: Line contact between cylindrical rollers and raceways provides much larger effective contact area than ball bearings, with extremely strong radial load capacity to perfectly adapt to full-load conditions of frequent start-stop and high-torque rotation of swing motor.
Separable Split Structure: The inner ring and outer ring are fully detachable. During equipment maintenance, only the damaged single component needs to be replaced instead of the whole bearing set, significantly cutting spare parts purchasing costs for excavator hydraulic system maintenance.
Super-Finished Raceway Process: Mirror precision grinding on inner and outer raceways achieves ultra-low surface roughness, reducing running friction and operating temperature. It avoids high-temperature seizure and abnormal wear failures during long-term continuous rotation operation.

3. Precision Grade Selection Guide

P0: Standard general precision with high cost performance, suitable for regular earth excavation and routine maintenance replacement of swing motors of excavators on construction sites
P6: Tighter dimensional tolerance for raceway and outer diameter reduces running vibration and heat generation, ideal for engineering fleets with 24-hour non-stop heavy continuous excavation construction in mines
P5: High-precision grade for complete excavator overhaul and swing motor hydraulic transmission performance upgrade, with greatly improved running concentricity and stability

4. Quality & Installation Instruction

7Y4270 cylindrical roller bearing is strictly manufactured to Caterpillar OEM specifications, complete with separable three-piece matching components. No extra accessories are required for direct installation on excavator swing motor positions. Every finished product passes full inspection on bearing hardness, internal clearance, raceway finish and dimensional tolerance before delivery. Custom P0/P6/P5 precision grades are available for bulk orders.

Installation steps: 1. Thoroughly clean swing motor housing and motor drive shaft journal to remove hydraulic oil, silt and impurities; 2. Press fit inner ring onto drive shaft first, then assemble roller cage; 3. Align and install outer ring, fasten positioning retaining ring evenly; 4. Fill matched special hydraulic lubricating grease for construction machinery and finish assembly & commissioning.

5. Application Scenarios

Widely applied to swing motor repair of Caterpillar E325B/E330B/E350/E375 excavators, export wholesale of Caterpillar construction machinery spare parts, and regular equipment maintenance of large mines and infrastructure engineering fleets. It solves common failures of original bearings such as abnormal running noise, roller pitting wear, raceway surface spalling, excessive swing clearance, reduced load capacity and high-temperature seizure. The separable split structure allows replacement of only damaged parts, effectively saving purchasing costs for complete overhaul of excavator hydraulic system.

OEM Part Number

7Y4270

Bearing Type

Separable Cylindrical Roller Bearing

Applicable Equipment

Caterpillar Excavator Swing Motor

Compatible Models

E325B、E330B、E350、E375

Main Material

High Hardness Bearing Steel

Structural Feature

Separable inner & outer ring, split maintenance design

Precision Grade

Optional P0/P6/P5

Product Category

Caterpillar Excavator Swing Motor Cylindrical Roller Bearing

Performance Feature

Ultra-high radial load capacity, impact & wear resistant, split design reduces maintenance cost, suitable for high-frequency alternating load working conditions of swing motor

MOQ

1 Pieces

Lead Time

7 days

Supply Ability

Cartons per Week

Trade Terms

FOB, EXW

Description

1. Product Overview

2. Material & Processing Advantages

Bearing Base Material: Integrally forged from premium high-carbon chromium bearing steel with complete quenching and tempering heat treatment. Uniform hardness and stable metallurgical structure of rollers and raceways deliver excellent resistance to fatigue, pitting and surface spalling, capable of enduring continuous alternating heavy impact loads of excavator swing mechanism.
Cylindrical Roller Load Structure: Line contact between cylindrical rollers and raceways provides much larger effective contact area than ball bearings, with extremely strong radial load capacity to perfectly adapt to full-load conditions of frequent start-stop and high-torque rotation of swing motor.
Separable Split Structure: The inner ring and outer ring are fully detachable. During equipment maintenance, only the damaged single component needs to be replaced instead of the whole bearing set, significantly cutting spare parts purchasing costs for excavator hydraulic system maintenance.
Super-Finished Raceway Process: Mirror precision grinding on inner and outer raceways achieves ultra-low surface roughness, reducing running friction and operating temperature. It avoids high-temperature seizure and abnormal wear failures during long-term continuous rotation operation.

3. Precision Grade Selection Guide

P0: Standard general precision with high cost performance, suitable for regular earth excavation and routine maintenance replacement of swing motors of excavators on construction sites
P6: Tighter dimensional tolerance for raceway and outer diameter reduces running vibration and heat generation, ideal for engineering fleets with 24-hour non-stop heavy continuous excavation construction in mines
P5: High-precision grade for complete excavator overhaul and swing motor hydraulic transmission performance upgrade, with greatly improved running concentricity and stability