CAT 581-7438 57.15mm Inner Diameter Spherical Bearing

CAT 581-7438 YM is a Caterpillar genuine spherical locating bearing (general purpose type). The following is pure original factory information (no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 581-7438 (5817438) YM Spherical Locating Bearing

Part Type: Radial spherical sliding bearing, used for hinge positioning and angular compensation, absorbing off-center loads and misalignment

Material: Outer ring 42CrMo, inner ring 40Cr, liner CuPb10Sn10, plating 0.03 mm lead-tin alloy

Key Dimensions: Inner diameter 57.15 mm (H7), outer diameter 85.00 mm (r6), width 35.00 mm, spherical radius R42.5 mm

Structural Features: Spherical outer ring, cylindrical inner ring, no oil groove or oil hole, chamfered ends 2×45°, no seal ring

Surface Treatment: Blackened outer ring + Rust-preventive oil, lead-tin alloy plated inner ring
Match clearance: Inner ring to shaft clearance 0.025–0.045 mm, outer ring to mounting hole interference 0.020–0.035 mm
Operating temperature: -40℃ ～ +120℃
Rated radial load: Static 28 kN, Dynamic 15 kN
Permissible speed: ≤ 50 rpm (with adequate lubrication)
Weight: 0.82 kg
Compatible models and assemblies:
Excavators: CAT 320D2, 323D2, 326D2 (boom link, boom link positioning)
Loaders: CAT 950M, 966M (rocker arm, link hinge positioning)
Bulldozers: CAT D6N, D6T (tilt cylinder link, blade link positioning)
Matching parts: 581-7438 positioning bearing, 4K-1098 Trunnion, retaining ring, lithium-based grease

Installation and Fitting Points
Clean the mounting holes and shaft, removing burrs and rust. Mounting hole roughness Ra≤1.6μm, shaft Ra≤0.8μm.

Cold press-fit the outer ring with a pressing force of 8–12 kN. Do not strike or heat-fit.

Ensure a clearance of 0.025–0.045 mm between the inner ring and shaft, with no axial movement of the outer ring and no jamming during rotation.

Apply lithium-based grease to the inner bore before assembly. After assembly, the spherical surface should rotate freely.