CAT 090-3178 Needle Roller Bearing

CAT 090-3178 is a Caterpillar single-row deep groove ball bearing, suitable for transmission components such as hydraulic pumps and rotary motors in equipment such as excavators and loaders. It can withstand radial loads and adapt to medium-speed operating conditions, and features low friction and high reliability to ensure stable equipment operation. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 090-3178, Type: Single-row deep groove ball bearing, Material: High carbon chromium bearing steel (52100, quenching hardness HRC 60-64), Cage: Stamped steel plate, Single weight: Approximately 0.42 kg, Operating temperature: -30℃ to +120℃, Lubrication method: Oil lubrication / Grease lubrication, Design life: ≥10000 hours (normal operating conditions), Suitable for medium load and medium speed (≤4000 r/min) conditions

Key Dimensions
Inner diameter: 35 mm (tolerance 0/+0.008 mm), Outer diameter: 62 mm (tolerance 0/-0.012 mm), Total width: 17 mm (tolerance 0/-0.12 mm), Mounting chamfer: r1 mm, Radial clearance: 0.012-0.022 mm (cold state), Fit: Interference fit (interference between bearing housing bore and outer diameter) 0.012-0.020 mm), journal and inner diameter clearance 0.008-0.015 mm
Compatible Models and Parts: Compatible with hydraulic pump drive shafts and slewing mechanisms of Cat 312D and 315D excavators, 938H loaders, etc. Matching 090-3179 bearing seals and 5P-0960 extreme pressure lithium-based grease. Can be used in combination with 090-3177 bearings.
Performance Parameters: Basic rated dynamic load 20.5 kN, basic rated static load 11.2 kN, allowable radial load ≥15 kN, allowable axial load ≥3 kN, coefficient of friction ≤0.0015 (oil lubrication), limiting speed ≤5000 r/min (oil lubrication), ≤3800 r/min (grease lubrication)
Structural and Performance Advantages: Deep groove ball joint design, capable of simultaneously withstanding radial loads and bidirectional slight axial loads, adapting to multiple operating conditions of the transmission system and reducing component wear. The high-carbon chromium bearing steel material and precise dimensional tolerances ensure a stable fit with the shaft and bearing housing, effectively reducing operating noise and adapting to medium-speed rotation requirements.

It is compatible with multiple lubrication methods and maintains stable load-bearing and rotational performance under frequent start-stop and vibration conditions, improving the reliability of the transmission system.

Installation and Maintenance Points: Before installation, clean the bearing, shaft, and bearing housing bore, checking for burrs, rust, or cage damage. Use a dedicated press-fit tool for installation; do not strike to avoid damage to the rolling elements and raceways.

After installation, add appropriate grease to ensure sufficient lubrication. Install the elastic retaining ring to secure the bearing and prevent axial movement. Before operation, perform a no-load test run to check for abnormal noises and jamming, ensuring smooth rotation.

Maintenance: Check the lubrication and bearing wear every 1000 hours. If excessive clearance, abnormal noise, or abnormal temperature is found, repair immediately. When replacing bearings, if the journal wear exceeds 0.03 mm, the shaft must be replaced simultaneously. Do not mix bearings of different models.