CAT 394-0203 BEARING-GD

CAT 394-0203 YM is a Caterpillar general-purpose radial sleeve bearing (bushing), suitable for the boom, stick, and connecting rod hinges of mini excavators and loaders, used for swing connections under medium to low loads, bearing radial loads and low-speed swing. The following are the core information:

Core Technical Parameters
Item Details
Part Model: CAT 394-0203 (3940203) YM Radial Sleeve Bearing (Bushing), compatible with NLGI 2 lithium-based grease, matching pin 394-0204
Core Material: Outer layer low carbon steel (1020), inner layer copper-lead alloy (CuPb10Sn10), surface solid lubricant layer (PTFE + bronze powder), hardness HB 180–220, coefficient of friction ≤0.12
Key Dimensions: Inner diameter 44.45 mm, outer diameter 50.8 mm, length 50.8 mm, wall thickness 3.175 mm, unit weight approximately… 0.28 kg (0.62 lb)

Rated Load: Rated radial load 65 kN, suitable for oscillation frequency ≤ 5 times/minute, operating temperature -30℃ to +120℃

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

Suitable Working Conditions: Medium to low load, continuous operation, low-speed oscillation, can withstand slight impact and vibration

Core Functions and Structural Features:

Composite Layer Design: Copper-lead alloy inner layer + solid lubrication layer, good self-lubricating properties, reduces hinge friction and wear, suitable for temporary operation under oil-free or low-oil conditions.

Interference Fit Installation: Interference fit with seat bore (interference 0.015–0.03 mm), radial runout ≤ 0.03 mm after installation, ensuring smooth operation.

Highly adaptable: Compatible with various small and medium-sized equipment hinges, with a standard operating life of over 4800 hours, wear-resistant and corrosion-resistant.

Installation and Maintenance Points

Installation Specifications: Clean the seat hole and bushing surface, ensuring it is free of oil, rust, and impurities. Use cold pressing, controlling the pressing force to 8–12 kN. Do not strike the end face.

Seat hole tolerance: +0.01–+0.025 mm. After installation, check the inner diameter roundness to be ≤0.015 mm.

After installation, apply NLGI 2 lithium-based grease to ensure proper lubrication.

Maintenance Recommendations: Check the operating status every 500 working hours, looking for looseness, abnormal noise, and leaks.

Replace when the inner diameter wear exceeds 0.18 mm or the surface lubricating layer peels off. Replace the matching pins and dust rings simultaneously to ensure proper fit.