CAT 574-2090 BEARING-SLEE

CAT 574-2090 is a Caterpillar straight-sleeve bearing used for hydraulic cylinder hinge points/connecting rod pins. Its core function is to reduce friction between the pin and the mounting hole, bear radial loads, and provide positioning. It is suitable for the boom/stick cylinder hinge points of Cat 320GC/323GC excavators, 950GC loaders, and other models. The following is professional structured information.

Core Parameters (Professional Version)

Project Details
Basic Attributes
Model 574-2090, 2 pieces per unit (symmetrical arrangement), compatible shaft diameter 63.5 mm (2.5 inches), matching trunnion 1U-3582, self-aligning bearing 510-7300, single weight 2.1 kg, used for the hinge joint between hydraulic cylinder trunnion and frame/boom

Key Dimensions
Inner diameter 63.5 mm (tolerance H7: 0–+0.030 mm), outer diameter 82 mm (tolerance m6: +0.015–+0.035 mm), width 38 mm (tolerance ±0.1 mm), chamfer at both ends 1.5×45° (tolerance ±0.1 mm), lubrication holes M8×1.25 (depth 15 mm, 2 evenly distributed)

Material and Process
Base material is 42CrMo alloy steel (tempered hardness) HB280–320), hard chrome plated inner bore surface (thickness 0.02–0.03 mm, hardness HV700–800), blackened outer surface for corrosion protection, inner bore roughness Ra≤0.4 μm, compatible with Cat MTO-1000 lithium-based grease.

Performance Parameters: Rated radial static load 120 kN, permissible operating temperature -40℃ to +120℃, coefficient of friction ≤0.08 (lubricated condition), radial clearance 0.05–0.10 mm, fatigue life ≥8000 hours (standard operating conditions).

Compatible Models: Cat 320GC/323GC/326GC excavators, 950GC/962GC loaders, M318F wheeled excavators; matching cylinder model 359-0677, lug assembly. 505-1291

Installation and Maintenance Points: Before installation, clean the inner and outer surfaces of the bearing and the mounting hole. The mounting hole needs to be bored to φ82H7 (tolerance 0–+0.030 mm). Use cold mounting (freeze at -20℃ for 1 hour) before pressing in, with a pressing force ≤60 kN, ensuring the bearing end face fits snugly against the mounting surface (gap ≤0.03 mm).

Maintenance Cycle: Every 500 hours, add Cat-specific lithium-based grease (add until overflowing from the lubrication hole). Check for wear on the inner hole (replace if wear >0.2 mm). Replace the dust seal immediately if damaged.

Troubleshooting: If there is abnormal noise/increased resistance at the hinge point, first check for bearing wear, blocked lubrication channels, and deformed mounting holes. Replace components and repair mounting holes if necessary.