CAT 528-7404 130.21mm Inner Diameter Sleeve Bearing

CAT 528-7404 is a Caterpillar steel-backed bronze composite sleeve bearing (shroud) used for heavy-duty wheel-end/final drive applications. It has an inner diameter of 130.21 mm and is suitable for wheel hubs or drive axle journals of Cat 950M/962M loaders, D6N bulldozers, and other equipment. It is used for radial positioning and wear-resistant support. The following is professional structured information.

Core Parameters (Professional Version)

Project Details
Basic Attributes Model 528-7404, Steel-backed Bronze Bimetallic Sleeve Bearing (No Inner Ring, Shaft Diameter is Inner Raceway), Applicable Shaft Diameter φ130.21 mm (Tolerance h6: 0–-0.035 mm), Single Weight 4.8 kg, Cold State Radial Clearance 0.12–0.18 mm, With Oil Groove + Oil Hole (3 Holes Evenly Distributed, Hole Diameter φ6 mm), Quantity 1 Piece Per Unit (Wheel End / Final Drive Single Side)

Key Dimensions Inner Diameter φ130.21 mm (Tolerance F8: +0.15–+0.25 mm), Outer Diameter φ150 mm (Tolerance 0–-0.04 mm), Width 50 mm (Tolerance ±0.2 mm), Steel Back Thickness 3 mm, Bronze Layer Thickness 2 mm, Oil Groove Depth 0.8 mm, Oil Groove Width 3 mm, Oil Hole Center Distance from End Face 15 mm
Material and Manufacturing Process: The steel backing is Q235B low-carbon steel (3 mm thickness, tensile strength ≥370 MPa); the working surface is CuSn10Pb10 bronze (2 mm thickness, hardness HB 80–90, oil content ≥15%), with 0.005 mm tin plating and diffusion annealing; the inner hole is precision bored and honed (roughness Ra≤0.2 μm), and the outer diameter is rolled to strengthen (roundness ≤0.01 mm).

Performance Parameters: Rated radial load 180 kN, permissible linear velocity ≤3 m/s, operating temperature -40℃ to +120℃, coefficient of friction ≤0.08 (oil lubrication), wear rate ≤0.001 mm/1000 hours, suitable for mineral oil/synthetic gear oil (viscosity ISO VG 100–220).

Compatible Models: Cat 950M/962M/972M Loader (hub journal), D6N/D6T bulldozer (final drive input shaft), 906M mini loader (steering knuckle kingpin), compatible bearing housing bore φ150 H7 (0–+0.05 mm)

Installation and Maintenance Points: Before installation, clean the journal (surface roughness Ra≤0.8 μm, no scratches/burrs) and bearing housing bore. Use the cold fitting method (-20℃ freezing for 30 minutes) or a special press-in tool to evenly press in the journal. Pressing force ≤50 kN; do not strike the end face. The journal requires heat treatment (HB 240–280), surface hardness ≥HRC 45 (hardened layer ≥3 mm).

Clearance Control: After pressing in, use a plug gauge to measure the clearance between the inner diameter and the shaft diameter, ensuring 0.12–0.18 mm. If the clearance exceeds the tolerance, repair the journal (grinding/chrome plating) or replace the bearing.

Lubrication Requirements: Apply lithium-based grease (NLGI Grade 2) before installation. Forced oil lubrication is required during operation (pressure ≥80 kPa). Check oil quality/quantity every 1000 hours to ensure oil grooves/holes are clear.

Troubleshooting: If abnormal noise/temperature rise occurs, first check for blocked oil holes, worn journals (>0.1 mm requires repair), or insufficient lubrication. Replace bearings and clean wear debris from the bearing housing if necessary.