8D9909 Complete Tapered Roller Bearing Assembly for Caterpillar Motor Grader 120H 120G 135H Construction Machinery Replacement Spare Parts

Name: 8D9909 Complete Tapered Roller Bearing Assembly for Caterpillar Motor Grader 120H 120G 135H Construction Machinery Replacement Spare Parts
Brand: GLOBALMACHEX
SKU: 8D9909
Availability: InStock
Rating: 5 (1 reviews)

8D9909 complete double row tapered roller bearing assembly is dedicated replacement spare part for axles and differentials of Caterpillar motor graders 120H, 120G and 135H. The whole bearing is forged and heat-treated from high-hardness bearing steel with optional P0/P6/P5 precision grades. Double-row tapered roller structure bears heavy combined radial and bidirectional axial loads simultaneously. Equipped with retaining ring sealing structure to block dust and silt, it adapts to long-hour heavy-duty grading and bumpy driving of motor graders in road construction and mining sites. The full assembly can directly replace OEM bearing sets, serving as core wearable spare parts for axle transmission maintenance and overhaul of Caterpillar motor graders.

$27.79

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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

8D9909 complete tapered roller bearing assembly is specially developed for Caterpillar motor grader series 120G, 120H and 135H, with 1:1 OEM-matched dimensions. The integrated full set consists of inner ring, double-row roller cage, outer ring and positioning retaining ring. It is installed on heavy-load support positions of motor grader axles and differential transmissions. During heavy grading, road leveling and bumpy site driving, the bearing continuously bears bidirectional axial thrust and ultra-heavy radial loads. The integrated full assembly avoids separate disassembly of parts, and can be replaced as a whole during maintenance, greatly cutting motor grader downtime and operation losses of road construction fleets.

2. Material & Processing Advantages

Integral Forged Bearing Steel Blank: Integrally forged from national standard premium bearing steel with complete quenching and tempering heat treatment. Uniform and stable hardness of rollers and raceways, fine metallurgical structure delivers outstanding resistance to fatigue, pitting and surface spalling, adapting to continuous alternating heavy impact loads of motor graders.
Double-Row Tapered Roller Load Structure: Line contact between double-row tapered rollers and raceways greatly expands effective bearing area, which can bear radial force and forward/reverse bidirectional axial loads at the same time, perfectly coping with complex impact loads generated by steering and grading operations of motor graders.
Matching Positioning Retaining Ring for Protection: Standard metal positioning retaining ring accurately limits the axial position of outer ring, blocks construction silt, gravel and dust from entering raceway, preventing roller rust, jamming and premature wear failure.
Super-Finished Precision Raceway: Mirror-level super-finish grinding on inner and outer raceways achieves ultra-low surface roughness, which reduces running friction and operating temperature. No high-temperature seizure or abnormal noise wear occurs during long continuous construction.

3. Precision Grade Selection Guide

P0: Standard general precision with high cost performance, suitable for daily grading work and routine full-set replacement of motor graders in municipal roads and small construction sites
P6: Tighter dimensional tolerance for raceway and outer diameter improves assembly concentricity, reduces running vibration and heat generation, ideal for highway engineering and mining fleets with 24-hour non-stop heavy construction
P5: High-precision grade for complete motor grader overhaul and axle differential transmission performance upgrade, with greatly improved high-speed running stability and concentricity

4. Quality & Installation Instruction

8D9909 tapered roller bearing is strictly manufactured to Caterpillar OEM standards. The complete matching set requires no secondary machining or grinding, and can be directly installed on axle and differential housing of motor graders. Every finished product passes full inspection on raceway hardness, internal clearance, dimensional tolerance and sealing protection performance before delivery. Custom P0/P6/P5 precision grades are available for bulk orders.

Installation steps:

Thoroughly clean differential housing and drive shaft journal to remove grease, sand and impurities;
Press the full bearing assembly evenly onto the shaft journal, align with positioning slots of mounting base;
Fasten the matching retaining ring evenly to limit axial displacement of outer ring;
Fill special high-temperature lubricating grease for construction machinery, debug the axle after assembly, and put into construction after confirming no excessive play or abnormal noise.

5. Application Scenarios

Widely applied to axle and differential repair & replacement of Caterpillar 120G/120H/135H motor graders, export wholesale of Caterpillar construction machinery spare parts, and regular equipment maintenance of municipal roads, highway infrastructure and open-pit mining engineering fleets. It solves common failures of original bearings such as abnormal running noise, roller pitting & spalling, raceway wear, excessive transmission clearance, reduced load capacity and high-temperature seizure. The integrated full-set bearing eliminates the need for separate parts replacement, effectively saving spare parts purchasing costs for complete motor grader overhaul.

OEM Part Number

8D9909

Bearing Assembly Type

Double Row Complete Tapered Roller Bearing Assembly

Applicable Equipment

Caterpillar Motor Grader

Compatible Models

120H、120G、135H

Main Material

High Hardness Bearing Steel

Bearing Structure

Double row tapered rollers with positioning retaining ring

Precision Grade

Optional P0/P6/P5

Product Category

Caterpillar Motor Grader Axle Differential Tapered Roller Bearing

Performance Feature

Double row design for high load capacity, withstand two-way axial force, dust-proof & wear-resistant sealing ring, full assembly for easy replacement, suitable for heavy road construction conditions

MOQ

1 Pieces

Lead Time

7 days

Supply Ability

Cartons per Week

Trade Terms

FOB, EXW

Description

1. Product Overview

2. Material & Processing Advantages

Integral Forged Bearing Steel Blank: Integrally forged from national standard premium bearing steel with complete quenching and tempering heat treatment. Uniform and stable hardness of rollers and raceways, fine metallurgical structure delivers outstanding resistance to fatigue, pitting and surface spalling, adapting to continuous alternating heavy impact loads of motor graders.
Double-Row Tapered Roller Load Structure: Line contact between double-row tapered rollers and raceways greatly expands effective bearing area, which can bear radial force and forward/reverse bidirectional axial loads at the same time, perfectly coping with complex impact loads generated by steering and grading operations of motor graders.
Matching Positioning Retaining Ring for Protection: Standard metal positioning retaining ring accurately limits the axial position of outer ring, blocks construction silt, gravel and dust from entering raceway, preventing roller rust, jamming and premature wear failure.
Super-Finished Precision Raceway: Mirror-level super-finish grinding on inner and outer raceways achieves ultra-low surface roughness, which reduces running friction and operating temperature. No high-temperature seizure or abnormal noise wear occurs during long continuous construction.

3. Precision Grade Selection Guide

P0: Standard general precision with high cost performance, suitable for daily grading work and routine full-set replacement of motor graders in municipal roads and small construction sites
P6: Tighter dimensional tolerance for raceway and outer diameter improves assembly concentricity, reduces running vibration and heat generation, ideal for highway engineering and mining fleets with 24-hour non-stop heavy construction
P5: High-precision grade for complete motor grader overhaul and axle differential transmission performance upgrade, with greatly improved high-speed running stability and concentricity

4. Quality & Installation Instruction

Installation steps:

Thoroughly clean differential housing and drive shaft journal to remove grease, sand and impurities;
Press the full bearing assembly evenly onto the shaft journal, align with positioning slots of mounting base;
Fasten the matching retaining ring evenly to limit axial displacement of outer ring;
Fill special high-temperature lubricating grease for construction machinery, debug the axle after assembly, and put into construction after confirming no excessive play or abnormal noise.