CAT 584-6660 Straight Sleeve Bearing

CAT 584-6660 is a Caterpillar straight sleeve bearing (sliding bearing/sleeve), suitable for small to medium loads, low-speed rotation, or reciprocating motion conditions. It is commonly used in loaders, excavators, and in connecting rod pins, shafts, and hydraulic cylinders. The following is structured technical and application information from Cat® Parts.

Core Technical Parameters

Item Details
Basic Attributes Model 584-6660, type is straight carbon steel sleeve bearing, material is high carbon steel (carbon content 0.9-1.05%), inner/outer surface hardened (hardness 58-62 HRC), single weight approximately 0.33 kg, working temperature -40℃ to +100℃, lubrication method is oil lubrication (ISO VG 46 anti-wear hydraulic oil) or grease lubrication (NLGI 2 lithium-based grease), fit tolerance: inner diameter H7, outer diameter r6, surface roughness Ra≤0.8 μm

Key Dimensions Inner diameter 59.9 mm (2.36 in), outer diameter 70 mm (2.75 in), total length 42 mm (1.65 in), chamfer 2×45°, wall thickness 5.05 mm, radial clearance 0.08-0.12 mm, no oil groove / Oil hole (requires grease nipple lubrication)

Compatible Models and Locations: Compatible with Cat 938M/950M loaders, 320GC/323GC excavators, and 420F2/430F2 excavator loaders. Installed on boom pins, stick connecting rod pins, hydraulic cylinder lugs, etc., 1-2 pieces per location. Fits shaft diameter 59.9 mm, rated load ≤ 80 kN.

Performance Parameters: Radial rated static load ≥ 280 kN, maximum permissible linear velocity ≤ 2 m/s, coefficient of friction ≤ 0.08 (boundary lubrication), service life ≥ 8000 hours, assembly clearance 0.08-0.12 mm.

Structural and Performance Advantages: High carbon steel material: hardened layer depth 0.8-1.2 mm, possessing excellent wear resistance and impact resistance, suitable for heavy-duty pin locations, reducing the risk of wear and deformation.

Straight-cylinder, oil-groove-free design: Suitable for applications requiring external forced lubrication. Precise oil supply via grease fitting ensures adequate lubrication and reduces friction loss.

Compact size: Small outer diameter and moderate length, suitable for space-constrained applications, facilitating installation and replacement. Compatible with various small and medium-sized pins.

Low cost and high reliability: Simple structure and easy maintenance. Compared to rolling bearings, it is more suitable for harsh conditions such as dust and impact, and is less prone to jamming due to foreign objects.

Installation and maintenance points:
Installation process: Clean the journal and bearing housing bore, ensuring no burrs or rust; use the cold fitting method (interference 0.02-0.04 mm), pressing evenly with a special pressure block, avoiding hammering; after installation, check the inner diameter roundness and cylindricity, with an error ≤0.01 mm; install the grease fitting and add grease until overflowing.

Maintenance Cycle: Check lubrication status and replenish lubricating oil/grease every 1000 hours; check bearing wear every 2000 hours, replace when inner diameter wear exceeds 0.2 mm; under harsh operating conditions (dusty, heavy load), shorten the maintenance cycle to 500-800 hours.

Common Faults and Solutions: Excessive wear is often due to insufficient lubrication, requiring increased lubrication frequency or replacement with high-viscosity grease; bearing seizure is often due to insufficient clearance, requiring re-selecting a suitable clearance or replacing the bearing; abnormal noise is often due to loose bearing housing bores, requiring inspection and tightening.