CAT 166-7562 Pump Actuator Bushing

CAT 166-7562 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 bear radial loads, reduce friction between the pin and cylinder lug, and provide positioning and guidance. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 166-7562, Type: Flangeless steel-backed bronze self-lubricating bushing, Suitable for Cat front-end workpiece cylinder articulation, Material: Steel back + high-strength brass alloy (CuZn25Al6, containing graphite particles), Inner diameter φ65 mm, Outer diameter φ80 mm, Length 45 mm, Single weight approximately 0.75 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 +0.012/-0.008 mm, outer diameter tolerance +0.020/-0.010 mm, length tolerance ±0.12 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: The steel backing is made of Q235 low carbon steel (1.5 mm thick), the brass layer is 2.5 mm thick (containing 3-5% graphite self-lubricating particles), manufactured through integral sintering + precision boring + honing processes. The brass layer hardness is HB 100-110, the tensile strength of the steel backing is ≥420 MPa, the bonding strength is ≥140 MPa, and there are no defects such as pores or cracks.

Compatible Models: Cat 320D2/323D2/326D2 excavator boom and stick cylinder articulation; 966M/972M loader boom cylinder articulation; D6K/D7E bulldozer blade cylinder articulation. Fits pin diameter φ65 mm, commonly used with 166-7563 seals and 166-7564 pins.

Assembly Fit: Interference fit with cylinder lug bore (0.020-0.030 mm); clearance fit with pin (0.08-0.12 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℃, 3-5 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 1000 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 800 hours. In dusty/humid conditions, shorten the interval to 400 hours. Avoid mixing different greases.