CAT 580-6012 SLEEVE-SEM

CAT 580-6012 is a Caterpillar genuine SEM series sleeve, suitable for positioning and protection of shafts in engineering machinery chassis, transmission, or hydraulic systems. It is commonly used for bearing positioning, shaft end sealing, or component spacing, and is suitable for specific heavy-duty and impact conditions.

Core Technical Parameters

Item Details
Part Model: CAT 580-6012 Sleeve (Sleeve-SEM)

Material: Carbon steel / Alloy steel, galvanized or anodized surface, rust-proof and wear-resistant, hardness HRC 45-50, suitable for heavy-duty positioning applications

Key Dimensions: Inner diameter approx. 45mm, outer diameter approx. 55mm, length approx. 70mm, wall thickness 5mm, chamfer at both ends r≈1mm, suitable for 45mm diameter shafts / pins

Compatible Machines: Commonly used in 336D2/349D2 excavators, 980H loaders, D6T bulldozers, etc., for drive axle bearing positioning, hydraulic motor bushings, connecting rod spacers, etc.

Performance Characteristics: High rigidity, high dimensional accuracy (tolerance IT6-IT7), oil and temperature resistant (-30℃ to…) (100℃), impact-resistant, suitable for high-frequency vibration and low-speed heavy-load conditions.
Core Functions and Structure
* **Positioning and Fixing:** Serves as a positioning element between shafts and bearings/mounting seats, limiting axial movement of components, ensuring assembly accuracy, preventing abnormal wear caused by bearing misalignment, and improving transmission stability.
* **Distance Protection:** Used for distance control between multiple components, preventing mutual friction and isolating oil and dust to reduce component damage caused by impurities.
* **Load Transfer:** Adapts to radial and slight axial loads, dispersing stress, protecting the contact surface between the shaft and mounting seat, reducing the risk of localized fatigue damage, and extending component life.
* **Installation and Maintenance Points:**
* **Installation Specifications:** Clean the shaft, sleeve, and mounting seat surfaces to remove oil, rust, and impurities; check that the sleeve is free from deformation and cracks, and that its dimensions meet assembly requirements.
* **Installation Methods:** Use cold pressing or hot fitting (heating temperature ≤150℃) for installation. Do not directly strike to prevent sleeve deformation or shaft surface damage; after installation, check that the sleeve end face fits snugly against adjacent components without gaps.

Secure the sleeve with a locating retaining ring or lock nut to ensure no axial movement on the shaft and guarantee reliable positioning.

Maintenance Recommendations: Every 1500 working hours, check the sleeve for looseness or deformation, and ensure the surface coating is intact. Replace immediately if wear or corrosion is observed.

Under heavy load/harsh conditions, regularly inspect the wear of adjacent components (bearings, shaft) and perform simultaneous maintenance to prevent chain failures caused by sleeve failure.