CAT 175-4071 46mm Inner Diameter Straight Sleeve Bearing

CAT 175-4071 is a Caterpillar straight powder metallurgy (P/M) sleeve bearing (without oil grooves/holes, suitable for front axle pin joints), adapted for equipment such as M318/M320 wheeled excavators, used for radial positioning and low-friction sliding support. The following is professional structured information.

Core Parameters (Professional Version)

Project Details
Basic Attributes Model 175-4071, Straight Flangeless Sleeve Bearing (Sliding Bearing/Bushing), Inner Diameter 46 mm (1.811 in, Tolerance H7: 0–+0.025 mm), Unit Weight 0.032 kg, Cold Radial Clearance 0.015–0.04 mm, Quantity per Unit 2 (Front Axle Left and Right Steering Knuckle Pins)

Key Dimensions Inner Diameter φ46 mm (Tolerance F7: +0.025–+0.04 mm), Outer Diameter φ50 mm (1.968 in, Tolerance 0–-0.02 mm), Length 39.85 mm (1.57 in, Tolerance ±0.1 mm), Wall Thickness 2 mm, Chamfered Ends 0.5 mm × 45°, No Oil Groove/Oil Hole, Flangeless

Material and Manufacturing Process The matrix is ​​powder metallurgy alloy steel (Fe-Cu-C-Ni, density ≥6.8 g/cm³, hardness HB 180–220), porosity 12%–15% (oil-impregnated self-lubricating, impregnated with SAE 30 machine oil), surface without electroplating, inner hole roughness Ra≤0.4 μm, outer circle roughness Ra≤0.8 μm.

Performance parameters: Rated radial load 12 kN (linear velocity ≤0.5 m/s), coefficient of friction ≤0.1 (boundary lubrication), operating temperature -30℃ to +120℃, compatible pin hardness HRC 45–50 (hardened layer ≥1 mm), compatible seat hole φ50 H7 (0–+0.025 mm).

Compatible models: Wheeled excavators M318/M320/M318C MH/M322C, front axle steering knuckle pin/balance shaft joint, compatible pin diameter φ46 mm (tolerance). h6: 0–-0.016 mm

Installation and Maintenance Points: Before installation, clean the pin (surface roughness Ra≤0.8 μm, burr-free) and seat hole. Press in evenly with a special pressure sleeve (press the outer ring end face, pressing force ≤10 kN). Do not strike the inner hole. The pin needs to be tempered to HB 220–250 and surface hardened to HRC 45–50 (hardened layer ≥1 mm).

Clearance Control: After installation, use a plug gauge to measure the radial clearance, ensuring 0.015–0.04 mm. If the clearance exceeds the tolerance, replace the bushing or repair the pin/seat hole (roundness ≤0.01 mm).

Lubrication Requirements: Factory-immersed in SAE 30 machine oil (pore oil self-lubricating). During operation, replenish with lithium-based grease (NLGI grade 2, injected through the seat hole grease fitting) every 500 hours to avoid dry friction leading to wear.

Troubleshooting: If abnormal noise or jamming occurs, first check the bushing for wear (inner diameter wear > 0.1 mm requires replacement), pin corrosion, or insufficient lubrication. If necessary, replace the bushing and clean the joint cavity of impurities.