CAT 077-5470 Linear Aligning Bushing

CAT 077-5470 is a Caterpillar straight-tube steel bushing, suitable for boom pins, stick pins, connecting rods, and other parts of Cat 320/323/326 excavators, 966K/972K loaders, etc. It is used for sliding support and wear protection, reducing friction and wear between the shaft and the housing, and is a key wear-resistant component of the working device and transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 077-5470, Type: Straight cylindrical steel bushing, Material: 20CrMo alloy steel (internal quenching HRC58-62, surface oxidation treatment, corrosion resistance ≥72 hours salt spray), Single weight: approximately 0.32 kg, Applicable temperature: -40℃ to +150℃, Compatible grease: NLGI 2 lithium-based grease or SAE 15W-40 Cat® Parts engine oil

Key Dimensions
Inner diameter: 50.80 mm (compatible shaft diameter tolerance 0/-0.02 mm), Outer diameter: 63.50 mm (tolerance 0/-0.03 mm), Length: 31.75 mm (tolerance ±0.10 mm), Wall thickness: 6.35 mm, Inner hole surface roughness: Ra≤0.4 μm, Chamfers at both ends: C1.5×45°, Compatible housing bore diameter 63.50 mm (Tolerance +0.02/-0.01 mm)

Compatible Models and Applications: Compatible with Cat 320 excavator boom pin bushing, 323 excavator bucket pin bushing, 966K loader boom pin bushing, and D6T bulldozer balance shaft bushing. One piece per component, installed between the housing bore and the pin, providing sliding support and positioning.

Performance Parameters: Rated radial dynamic load ≥60 kN, rated radial static load ≥90 kN, coefficient of friction μ≤0.002 (oil lubrication), wear life ≥2000 hours (under rated load), limiting speed ≤1000 r/min (oil lubrication), impact resistance ≥100 kN (instantaneous).

Structural and Performance Advantages: Excellent material: 20CrMo Alloy steel boasts high strength and toughness. Internal quenching enhances hardness and wear resistance, while anodized surfaces improve corrosion resistance, making it suitable for harsh working conditions in engineering machinery, such as dusty, humid, and heavy-load environments, extending component lifespan.

Precise Fit: Strict dimensional tolerance control ensures a precise interference fit (0.01-0.03 mm) with original factory pins and housing bores, guaranteeing stable support and ensuring equipment operational accuracy without loosening after installation.

Efficient Lubrication: The straight cylindrical structure facilitates uniform distribution of lubricating oil/grease. Low internal surface roughness reduces friction loss and energy consumption. It supports both oil and grease lubrication to meet diverse lubrication needs.

Easy Installation: Installation can be performed via cold pressing or hot fitting (cold pressing pressure ≤45 kN, hot fitting temperature 80-100℃), requiring no complex tooling, resulting in high installation efficiency and facilitating rapid on-site maintenance.

Installation and Maintenance Points:
**Before installation, clean the inner and outer surfaces of the bushing, the pin, and the housing bore. Check the bushing for cracks, deformation, and damage to the inner bore.** For cold pressing, use a special pressure block to apply even pressure and press the bushing into the housing bore. For hot pressing, heat the bushing and quickly insert it into the housing bore; it will automatically fit after cooling. After installation, check that the clearance between the bushing and the pin is 0.01-0.03 mm to ensure smooth sliding without jamming.

Every 1500 hours of maintenance: Check the bushing wear (replace if the inner bore wear is ≥0.1 mm), add lubricating oil/grease, and check the wear of the pin and housing bore. If the wear is severe, replace them simultaneously to prevent premature bushing failure.

Prioritize original parts. Aftermarket parts may have more material impurities, insufficient hardness, dimensional deviations, etc., which can easily lead to rapid bushing wear, causing accelerated wear on the shaft and housing, and affecting equipment operation.