CAT 533-8058 SLEEVE -SEM

CAT 533-8058 is a heavy-duty steel press-fit sleeve for Caterpillar SEM series loaders. It is used at the drive axle hub/steering knuckle hinge point, serving as a pin guide, wear-resistant protection, and impact buffer. It is a key wear-resistant component of the transmission and running gear system and is compatible with Cat® Parts for SEM 652D, 656D, 660D, and other models. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 533-8058, Type: Straight cylindrical, flangeless, heavy-duty sleeve, Material: 42CrMo alloy steel (quenched and tempered + nitrided), Single weight: approximately 1.8 kg, Applicable temperature: -40℃ to +120℃, Lubrication method: Grease lubrication (2 symmetrical lubrication holes), Installation method: Interference fit (interference amount 0.030-0.050 mm), Matching grease nipple: 1M-0884

Key Dimensions
Inner diameter: 60 mm (tolerance H7, +0.030/+0.000 mm), Outer diameter: 75 mm (tolerance r6, +0.045/+0.030 mm), Length: 80 mm (tolerance ±0.03 mm), Wall thickness: 7.5 mm, Lubrication hole diameter: 4.5 mm, Hole depth: 6 mm, Surface hardness: HRC 62-65 mm, cylindricity ≤ 0.008 mm, surface roughness Ra ≤ 0.8 μm
Compatible Models and Applications: Compatible with SEM 652D, 656D, and 660D loaders, installed at the drive axle wheel hub bearing housing, steering knuckle, and frame connection hinge. Supporting parts include 9T-4567 pins and 1M-0884 grease nipples. Withstands radial heavy loads and impacts, ensuring accuracy of travel and steering movements, and extending the life of pins and structural components.
Performance Parameters: Radial compressive strength ≥ 1200 MPa, impact toughness ≥ 80 J/cm², coefficient of friction ≤ 0.12 (grease lubrication), wear life ≥ 8000 hours, corrosion resistance meets ISO 9227 neutral salt spray test (48 hours rust-free), radial static load ≤ 180 kN, fatigue limit ≥ 500 MPa
Structural and Performance Advantages: Strong, tough, and wear-resistant: 42CrMo alloy steel, quenched and tempered + Nitriding treatment results in a hardened surface and a tough core, increasing wear resistance by approximately three times compared to ordinary carbon steel sleeves. This allows it to withstand high-frequency impacts and heavy-load conditions in high-intensity operations such as mining and infrastructure construction.

Precise Positioning: Strict dimensional tolerances and interference fit design prevent radial movement after press-fitting, ensuring pin coaxiality, reducing uneven wear at hinge points, and avoiding operational jamming and structural damage caused by widened clearances.

Efficient Lubrication: Symmetrical lubrication holes allow for the application of lithium-based grease through dedicated nozzles, forming a stable oil film, reducing the coefficient of friction, preventing premature failure due to dry friction, and extending maintenance intervals.

Excellent Adaptability: Specifically designed for critical hinge points of SEM series loaders, eliminating the need for custom installation tools, facilitating convenient maintenance and replacement, and reducing inventory and maintenance costs.