CAT 150-0909 BEARING

The CAT 150-0909 is a single-row tapered roller bearing designed by Caterpillar specifically for the travel gearbox of mini excavators. It is compatible with the 303/303.5/304 series models and is used to support the travel drive shaft, withstand radial and bidirectional axial heavy loads, and ensure stable and efficient operation of the travel system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 150-0909, Type: Single-row tapered roller bearing (including inner ring, outer ring, rollers, and cage), Material: High-carbon chromium bearing steel (chromium content 1.5-1.6%), Hardness after quenching and tempering: HRC60-64, Surface finish: Precision ground, Single weight: Approximately 0.85 kg, Operating temperature: -30℃ to +120℃, Lubrication method: Oil lubrication (recommended: SAE 80W-90 gear oil), Design life: ≥8000 hours (normal operating conditions)

Key Dimensions
Inner diameter: 65.0 mm (tolerance 0/+0.018 mm), Outer diameter: 110.0 mm (tolerance 0/-0.015 mm), Width: 28.0 mm (tolerance ±0.10 mm), Raceway angle: 10°, Number of rollers: 12, Roller diameter: 12.5 mm The cage is made of stamped steel plate, with an interference fit of 0.01-0.02 mm with the shaft and a clearance of 0.02-0.03 mm with the bearing housing. Radial runout ≤0.03 mm.

Suitable Machines and Applications: Compatible with small excavators such as Cat 303, 303.5C/303.5D/303.5E, 303C CR/303E CR, 304D CR/304E, etc. Used in the drive shaft support area of ​​the travel gearbox, suitable for low-speed, heavy-load travel drive conditions, and capable of withstanding both radial and bidirectional axial loads.

Performance Parameters: Rated dynamic radial load 78 kN, rated static radial load 102 kN, rated axial load 35 kN, limiting speed 2000 rpm (oil lubrication), impact load capacity ≥50 kN, wear resistance conforms to ISO 281 standard, corrosion resistance reaches ISO 9227 neutral salt spray test 24. No noticeable rust within hours.

Structural and Performance Advantages: The tapered roller structure can simultaneously withstand radial and bidirectional axial loads, adapting to complex stress scenarios during driving, effectively suppressing shaft movement and improving driving stability.

High-carbon chromium bearing steel undergoes professional heat treatment, resulting in high precision raceways and rollers, excellent wear resistance and fatigue resistance, suitable for harsh working conditions in engineering machinery, reducing the risk of early failure.

The integrated cage design ensures precise roller positioning, smooth operation, reduced noise and vibration, improved driving efficiency, and extended component lifespan.

Installation and Maintenance Points: Before installation, clean the journal, bearing housing, and bearing surface, checking for cracks and burrs; install the inner ring using the hot fitting method (oil temperature 80-90℃), the outer ring and bearing housing have a transition fit, installed using the press-fit method, avoiding forceful hammering that could damage the raceway; after installation, adjust the axial clearance to 0.03-0.05 mm, ensuring smooth and unobstructed rotation.

After installation, ensure the gearbox oil level is within specifications and the oil temperature does not exceed 85℃. During the initial operation (first 50 hours), regularly check the bearing temperature and for any abnormal noises; address any issues promptly.

Maintenance: Check bearing wear and clearance every 1500 hours. If pitting, peeling, or clearance exceeding 0.15 mm is observed on the raceway, replace the entire set immediately (do not mix different models of parts). During replacement, adjust the axial clearance according to the original manufacturer’s specifications to ensure operational accuracy.