CAT 379-0189 BEARING-SLV-GD

CAT 379-0189 YM is a steel-backed bronze straight sleeve bearing from Caterpillar’s Yellowmark series. It is suitable for low-speed, heavy-load, oscillating, or intermittently operating components such as connecting rods, rocker arms, and shift fork shafts in equipment like mini excavators and skid steer loaders. The following is structured technical and application information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 379-0189 YM, type is steel-backed bronze straight sleeve bearing (YM series, Yellowmark aftermarket part), material is steel back + CuSn10Pb10 bronze alloy, single weight 0.42 kg, operating temperature -20℃ to +150℃, lubrication method is pre-lubrication (oil-immersed bronze self-lubricating), fit tolerance: inner diameter H7, outer diameter g6, surface roughness Ra≤0.4 μm, suitable for low-speed oscillation or intermittent rotation conditions

Key Dimensions Inner diameter 50 mm (1.97 in), outer diameter 60 mm (2.36 in), total length 45 mm (1.77 in), wall thickness 5 mm, radial clearance 0.05-0.08 mm, chamfer at both ends 1×45°, suitable shaft diameter 50 mm (js6), mounting hole diameter 60 mm (H7)

Suitable Models and Locations Compatible with Cat 305.5E2 and 306E2 mini excavators, 226B3 skid steer loaders, 416F2 backhoe loaders, etc. Mounted on boom cylinder connecting rod pins, rocker arm shafts, gearbox shift fork shafts, etc., 1-2 pieces per location, used to withstand radial loads and slight oscillating loads.

Performance Parameters: Radial rated static load ≥280 kN, maximum permissible linear velocity ≤0.5 m/s, coefficient of friction ≤0.05 (dry friction) / ≤0.008 (oil lubrication), fatigue life ≥10000 hours, bearing pressure ≤25 MPa, suitable for impact loads ≤50 kN.

Structural and Performance Advantages: Steel-backed bronze composite structure: The steel back provides high strength and installation stability, while the bronze alloy layer contains solid lubricant, providing self-lubrication capabilities, suitable for low-oil/oil-free operating conditions. It offers 40% higher load capacity than pure bronze bearings and 60% better wear resistance than iron-based bearings.

Straight, oil-slot-free design: Suitable for oscillating or short-stroke reciprocating motions, avoiding localized stress concentration caused by oil slots. Ideal for non-continuous rotating parts such as booms and rocker arms, simplifying installation and maintenance.

Compact and lightweight: With a wall thickness of only 5 mm, it provides a larger inner diameter within the same installation space, adapting to the compact structure of small equipment. Weighing only 0.42 kg, it reduces overall weight and energy consumption.

Yellowmark Series Advantages: Identical appearance, compatibility, and functionality to Cat genuine parts, with a more competitive price and Caterpillar official warranty.

Installation and Maintenance Points (Original Data)

Installation Procedure: Clean the journal and mounting hole. Journal hardness ≥ HRC 45, surface roughness Ra ≤ 0.4 μm; cold press into the mounting hole (interference 0.015-0.025 mm), do not strike the end face; after installation, check radial clearance and end face runout (≤ 0.03 mm); regularly replenish NLGI 2 lithium-based grease.

Maintenance Cycle: Check lubrication status every 500 hours; check bearing wear every 1500 hours, replace when inner diameter wear exceeds 0.1 mm; disassemble and inspect every 3000 hours, replace the assembly when steel backing cracks or bronze layer peeling occurs; shorten to 250-500 hours under harsh operating conditions.

Common Faults and Solutions: Excessive wear is often due to insufficient lubrication, requiring increased lubrication frequency; abnormal noise is often due to journal wear or uneven bearing wear, requiring replacement of bearings and journals; jamming is often due to foreign object intrusion, requiring improved sealing and cleaning.