CAT 385-3790 BEARING-SLV-GD

CAT 385-3790 YM is a Caterpillar general-purpose load-bearing sleeve bearing, suitable for medium and small excavators and loaders with low to medium load hinge/pin positions, used to withstand radial loads and low-speed oscillation, suitable for light to medium impact conditions. The following is the core technology and application information for Cat®…:

Core Technical Parameters
Item Details
Part Model: CAT 385-3790 (3853790) YM General-purpose load-bearing sleeve bearing (suitable for medium to low loads, matching pin 385-3789, compatible with NLGI 2 lithium-based grease)

Core Material: 20CrMnTi alloy carburized steel, surface carburized and quenched, hardness HRC 58–62, carburized layer depth 0.6–0.8 mm, inner bore with axial lubrication groove, suitable for general lubrication requirements

Key Dimensions: Inner diameter 38.1 mm, outer diameter 50.8 mm, length 50.8 mm, wall thickness… 6.35 mm, single weight approximately 0.48 kg (1.06 lb)

Rated Load: Rated radial load 85 kN, limiting speed 500 rpm, operating temperature -30℃ to +120℃

Compatible Models: CAT 305.5E2/306E2 mini excavators (stick/linkage hinge), 906M loader (bucket pin), 226D3 skid steer loader (boom hinge)

Suitable Working Conditions: Low to medium load, continuous operation, swing frequency ≤ 5 times/minute, can withstand light impact loads

Core Functions and Structural Features:

General Compatibility: YM general load type, carburized and quenched process, balanced wear and impact resistance, suitable for low to medium load hinges, standard working condition service life can reach over 5000 hours.

Convenient Lubrication: The internal axial lubrication groove can store grease, reducing friction and wear between the pin and bushing, and reducing maintenance frequency.

Reliable Installation: The direct-sleeve structure features an interference fit with the seat bore (interference 0.015–0.03 mm). After installation, the coaxiality tolerance is ≤0.03 mm, ensuring operational accuracy.

Installation and Maintenance Points

Installation Specifications: Clean the seat bore and bushing surfaces, ensuring they are free of oil and rust. Use cold pressing, controlling the pressing force at 12–18 kN. Do not strike the end face.

Seat bore tolerance: +0.01–+0.025 mm. After installation, check for radial runout ≤0.03 mm.

After installation, apply NLGI 2 lithium-based grease, ensuring the lubrication groove is full.

Maintenance Recommendations: Check the operating status every 800 working hours, looking for abnormal noises, abnormal temperature rise, and seal leaks.

Replace the bushing promptly when the inner diameter wear exceeds 0.1 mm. Replace the bushing simultaneously with the matching pins and sealing rings to ensure sealing and lubrication effectiveness.