CAT 523-3016 86.2mm Inner Diameter Bearing Bush

CAT 523-3016 is a Caterpillar genuine steel-backed bronze self-lubricating bearing bushing (flangeless cylindrical type), suitable for the boom and stick cylinder articulation parts of Cat 320D2/323D2 excavators, 966M loaders, etc. It is used to reduce friction between the pin and cylinder lug, bear radial loads, and provide positioning and guidance. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 523-3016, Type: Flangeless steel-backed bronze bearing bushing, Suitable for Cat front-end workpiece cylinder articulation, Material: Steel back + high-strength brass alloy (CuZn25Al6), Inner diameter φ70 mm, Outer diameter φ85 mm, Length 50 mm, Single weight approximately 0.9 kg, Rated bearing pressure 200 MPa, Operating temperature -25℃ to +120℃, Compatible with NLGI 2 lithium-based grease (containing EP) Additive), with internal lubrication grooves (3 axial grooves + 1 circumferential groove), corrosion resistance rating IP65

Key Dimensions: Inner diameter tolerance +0.015/-0.010 mm, outer diameter tolerance +0.025/-0.015 mm, length tolerance ±0.15 mm, inner hole surface roughness Ra≤0.4 μm, outer diameter Ra≤1.6 μm, coaxiality ≤0.03 mm, chamfer at both ends 1×45°

Material and Process: Steel backing is made of Q235 low carbon steel (thickness 1.8 mm), brass layer thickness 2.7 mm (containing 3-5% graphite self-lubricating particles), integral sintering + precision boring + honing, brass layer hardness HB 100-110, steel backing tensile strength ≥420 MPa, bonding strength ≥140 MPa, free from defects such as pores and cracks

Compatible Models: Cat 320D2/323D2/326D2 excavator boom lifting cylinder and stick cylinder hinge; 966M/972M loader boom cylinder hinge; D6K/D7E bulldozer blade cylinder hinge. Fits pin diameter φ70 mm, commonly used with 523-3017 seals and 523-3018 pins.

Assembly Fit: Interference fit with cylinder lug bore (0.025-0.035 mm); clearance fit with pin (0.09-0.13 mm). After installation, both end faces should fit snugly with the cylinder lugs (deviation ≤0.1 mm). Grease injection holes should be aligned with the lug lubrication channels.

Installation and Maintenance Points: Before installation, clean the bushing, cylinder lug bore, and pin. Check for deformation, cracks, or brass layer peeling. Cool the bushing with liquid nitrogen (-196℃, 5-8 minutes). After a few minutes, cold press the bushing into the cylinder ear hole, or install it using a special pressing tool. Do not force it by hammering.

After installation, check that the bushing rotates/oscillates freely without jamming. Run it under no-load for 20 minutes, monitoring the temperature to ≤80℃. Check every 1200 hours. Replace immediately if the inner bore wear is >0.2 mm or if abnormal noise occurs.

The initial grease injection should be 1/2 of the bushing volume. Replenish every 900 hours. In dusty/humid conditions, shorten this to 450 hours. Avoid mixing different greases.