CAT 299-0859 BUSHING

CAT 299-0859 is a Caterpillar straight-sleeve steel bushing, suitable for medium-to-light load hinge points in equipment such as mini excavators and loaders, used to withstand low-speed oscillating radial loads. The following is core technology and application information:

Core Technical Parameters
Item Details
Part Model CAT 299-0859 (2990859) Straight-sleeve steel bushing (suitable for medium-to-light load hinge points, withstands radial loads + low-speed oscillation, compatible with pin 299-0858)

Core Material 20CrMnTi alloy carburized steel, surface carburized and quenched, hardness HRC 58–62, carburized layer depth 0.8–1.0 mm, inner hole includes axial lubrication groove, compatible with NLGI 2 lithium-based grease

Key Dimensions Inner diameter 41.28 mm, outer diameter 50.8 mm, length 50.8 mm, wall thickness 4.76 mm, single weight approx. 0.52 kg (1.15 kg) (lb)

Rated Load: Rated radial load 95 kN, limiting speed 500 rpm, operating temperature -30℃ to +120℃

Compatible Models: CAT 305.5E2/306E2 excavators (stick/linkage hinge), 236D3 compact tracked loader (boom pin), 908M mini loader (bucket hinge)

Suitable Working Conditions: Light to medium load, intermittent operation, oscillation frequency ≤5 times/minute, can withstand small impact loads

Core Functions and Structural Features:

High adaptability: Alloy carburized steel material, good impact resistance and wear resistance, suitable for small equipment hinges, service life can reach more than 5000 hours under standard working conditions.

Reliable lubrication: The internal axial lubrication groove design ensures uniform distribution of grease, reduces the coefficient of friction, and reduces adhesive wear between the pin and bushing.

Precise Installation: The direct-sleeve structure, with an interference fit to the mounting hole (interference 0.01–0.02 mm), ensures a coaxiality tolerance of ≤0.03 mm after installation, guaranteeing transmission accuracy.

Good Versatility: Adaptable to the hinge positions of various small devices, offering high versatility and convenient procurement and replacement.

Installation and Maintenance Points

Installation Specifications: Clean the mounting hole and mounting surface, ensuring they are free of oil and rust. Use cold pressing, controlling the pressing force to 10–12 kN. Do not strike the end face.

Mounting hole tolerance: +0.01–+0.02 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.

When the inner diameter wear exceeds 0.15 mm, it needs to be replaced in time. When replacing, the matching pin and sealing ring should be replaced at the same time to ensure the sealing and lubrication effect.