CAT 603-6179 Straight Sleeve Bearing

CAT 603-6179 is a Caterpillar straight sleeve bearing, compatible with Cat 320D/323D excavator boom pins and 966H loader rocker arm hinges. It is used for rotating/swinging support under heavy load conditions, reducing friction between the pin and the support while bearing radial loads. The following is professional structured information.

Core Parameters (Professional Version)

Project Details
Basic Attributes
Model 603-6179, Quantity 2 per unit, locating pin radial position, absorbs impact load, adapts to boom/rocker arm hinge point, matching pin 320-1234 (φ50 mm), matching seal 106-9903 (φ65×2.65 mm O-ring)

Key Dimensions
Outer diameter 65 mm (tolerance h7), inner diameter 50 mm (tolerance H7), length 45 mm, wall thickness 7.5 mm, chamfers at both ends C2×45°, inner hole surface roughness Ra≤0.4 μm, outer circle cylindricity≤0.01 mm, end face perpendicularity≤0.02 mm

Material and Process
Material is tin bronze (CuSn10Pb10), hardness HB80–100, tensile strength ≥220 MPa, oil content 15%–20% (volume fraction), self-lubricating inner bore, cadmium-plated outer surface (film thickness 5–8 μm), precision ground end faces, flatness ≤0.03 mm

Performance Parameters: Operating temperature -30℃ to +120℃, rated radial load ≥80 kN, coefficient of friction ≤0.1 (dry friction), maximum permissible linear velocity ≤0.8 m/s, wear life ≥5000 hours (normal working conditions), corrosion resistance rating IP65 (with seals)

Compatible Models: Cat 320D/323D excavator boom lower hinge point, 966H loader rocker arm and frame connection point, compatible bearing housing bore 65 mm (tolerance H7), pin diameter 50 mm (tolerance f7), installation clearance 0.02–0.05 mm

Installation and Maintenance Points: Clean the bearing housing bore and pin before installation, check for scratches/deformation, apply Cat MTO-1000 to the O-ring. Grease lubrication is required; the surface roughness of the bearing seat (Ra) should be ≤1.6 μm; the pressing force should be controlled at 8–12 kN (cold press installation, with the pressure head in contact with the end face).

After installation, the coaxiality between the inner hole and the pin should be ≤0.03 mm, with no jamming and flexible movement. Check the clearance every 2000 hours (replace if radial clearance >0.2 mm), and replenish grease (Cat MTO-1000, filling 1/3 of the bearing cavity) every 1000 hours.

In harsh operating conditions (such as mining/coastal areas), it is recommended to shorten the maintenance cycle to 1000 hours. Replace the bearing immediately if surface peeling/wear is observed to prevent excessive wear on the pin and support.