Description
CAT 308-9810 BEARING-SLV-GD
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The CAT 308-9810 YM is a Caterpillar steel-backed aluminum-based alloy straight-tube sleeve bearing. It is primarily used for the rotational support of chassis, connecting rods, and other components in engineering machinery. It is suitable for heavy-duty, low-speed operating conditions in medium and heavy-duty machinery and features high strength, wear resistance, and anti-seizure characteristics. It is a key transmission component that ensures stable rotation between parts and extends equipment life. The following is structured technical and application information:
Core Technical Parameters
Item Details
Basic Attributes
Model 308-9810 YM, Type: Straight-tube sleeve bearing (fixed bushing type), Material: Low-carbon alloy steel backing + aluminum-tin-silicon alloy (alloy layer thickness 0.7-0.9 mm, hardness HB 70-85), steel backing thickness 2.0 mm (quenching hardness HRC 28-32), Single weight approximately 0.28 kg, Operating temperature -40℃ to +180℃, Lubrication method: oil lubrication/grease lubrication, Design life ≥10000 hours (normal operating conditions), Suitable for heavy load, low speed (≤1500 r/min), reciprocating oscillating conditions
Key Dimensions
Inner diameter 41.28 mm (tolerance 0/+0.006 mm), Outer diameter 50.01 mm (tolerance 0/-0.009 mm), Total length 25.4 mm (tolerance 0/-0.1 mm) The bearing housing has a chamfer of r0.8 mm, a radial clearance of 0.06-0.08 mm (cold state), and an interference fit (0.015-0.025 mm interference between the bearing housing bore and the outer diameter). The journal clearance is 0.05-0.07 mm. Compatible Models and Parts: Suitable for connecting rods, rocker arms, and chassis pins of Cat 950H and 966K loaders, 320D2 and 336D2 excavators, etc. It is compatible with 103-8329 elastic retaining rings and 5P-0960 extreme pressure lithium-based grease. It is suitable for pin diameter connections of 41.28 mm and can be used with 308-9811 seals.
Performance Parameters: Basic rated dynamic load 25 kN, basic rated static load 48 kN, allowable radial load ≥18 kN, coefficient of friction ≤0.002 (oil lubrication), impact load ≥8 kN. kN, recommended grease filling rate 0.5-1.0 g/cm³, recommended operating speed ≤1200 r/min (oil lubrication), ≤800 r/min (grease lubrication)
Structural and Performance Advantages: Steel backing + aluminum-based alloy composite structure. The steel backing provides high-strength support, while the aluminum-based alloy layer offers excellent wear and anti-galling properties, suitable for metal-to-metal contact friction under heavy-duty conditions, reducing component wear.
The straight cylindrical design and precise dimensional tolerances ensure stable fit with pins and bearing housings, effectively absorbing vibration and reducing operating noise, suitable for frequent start-stop operations and large load fluctuations in construction machinery.
Suitable for multiple lubrication methods. Oil or grease lubrication can be selected according to operating conditions. The aluminum-based alloy layer can store lubricating oil, providing temporary lubrication when insufficient, improving bearing reliability.
Installation and Maintenance Points:
**Before installation, clean the bearing, pin, and bearing housing bore, checking for burrs, rust, or alloy layer peeling. Use a dedicated pressing tool to press the bearing into the housing bore; do not strike to avoid damaging the alloy layer. After pressing, check the fit between the bearing end face and the housing bore to ensure there is no misalignment.
After installation, add appropriate grease to ensure sufficient lubrication. Install a retaining ring to secure the bearing and prevent axial movement. Before operation, perform a no-load test run to check for abnormal noises or jamming, ensuring smooth rotation.
Maintenance: Check lubrication and bearing wear every 800 hours. If excessive clearance, abnormal noise, or oil leakage is found, repair immediately. When replacing bearings, if the journal wear exceeds 0.03 mm, the pin must also be replaced. Do not mix bearings of different models or brands.
