CAT 312-0113 BEARING

CAT 312-0113 is a Caterpillar original single-row deep groove ball bearing, suitable for engine accessory drives/hydraulic pump transmission systems, used to withstand radial loads and suitable for medium-to-low speed rotational conditions. The following are the core information:

Core Technical Parameters
Item Details
Part Model: CAT 312-0113 (3120113) Single-row Deep Groove Ball Bearing (Suitable for engine accessory drives/hydraulic pump transmissions, withstands radial loads, suitable for medium-to-low speed rotational conditions)

Core Material: Bearing steel (chromium-molybdenum alloy), outer ring hardness HRC 60–64, inner ring hardness HRC 58–62, cage is stamped steel plate, seal is nitrile rubber contact seal

Key Dimensions: Inner diameter 45 mm, outer diameter 100 mm, width 25 mm, chamfer radius 2 mm, single bearing weight approximately 0.85 kg (1.87 lb)

Rated Load: Basic dynamic load rating 58 kN, basic static load rating 38 kN, limiting speed 6500 rpm (grease lubrication), 8000 rpm (oil lubrication)
Compatible Machines: CAT 3126/C7 engine (accessory drive wheel system), 320D/323D excavator (hydraulic pump drive end), 938M loader (transmission input shaft front support)
Operating Suitability: Operating temperature -30℃ to +120℃, suitable for radial load-dominant conditions with minor bidirectional axial movement, compatible with NLGI 2 lithium-based grease
Core Functions and Structural Features:
Radial Load Bearing: Deep groove ball bearing structure, capable of withstanding pure radial loads, suitable for low-to-medium speed rotation scenarios (1500–4500 rpm) in accessory drive wheel systems and hydraulic pump drive ends.

Sealing Protection: Double-sided contact seals effectively prevent dust and moisture intrusion, preventing grease leakage, suitable for complex working conditions in construction machinery.

Easy Installation: Cylindrical bore design with interference fit to the shaft (interference 0.01–0.02 mm), ensuring coaxiality tolerance ≤0.03 mm after installation, guaranteeing transmission accuracy.

Lightweight Design: Stamped steel cage reduces weight while maintaining strength, meeting the lightweight requirements of engine accessory drive systems.

Installation and Maintenance Points

Installation Specifications: Clean the shaft and bearing housing mounting surfaces, ensuring they are free of oil and rust. Use cold pressing or hot mounting (heating temperature 80–100℃). Avoid direct impact on the inner and outer rings of the bearing.

Shaft diameter tolerance +0.01–+0.02 mm, bearing housing bore tolerance -0.01–0 mm. After installation, check radial runout ≤0.03 mm.

After installation, apply NLGI 2 lithium-based grease to ensure adequate lubrication of the bearing rolling elements.

Maintenance Recommendations: Check the bearing’s operating condition every 800 working hours, looking for abnormal noises, abnormal temperature rise (normal operating temperature ≤75℃), and seal leaks. When the radial clearance of a bearing exceeds 0.15 mm or pitting or peeling occurs on the surface of the rolling elements, it must be replaced promptly.

When replacing a bearing, original equipment manufacturer (OEM) bearings should be used first to ensure proper fit with the shaft and bearing housing.