CAT 599-8875 155mm Outer Diameter Straight Sleeve Bearing

CAT 599-8875 is a Caterpillar genuine straight-tube steel sleeve bearing (outer diameter 155mm), suitable for heavy-duty articulated parts such as the boom, stick, and connecting rod of large excavators, loaders, and other equipment. It is used for positioning pins, bearing radial loads, and reducing friction. The following is pure raw data and does not include replacement parts information for Cat®…

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 599-8875, Type: Straight-tube flangeless steel sleeve bearing, Suitable pin diameter 120 mm, Single weight 22.5 kg, Material: SAE 4140 alloy steel (surface hardened, hardness HRC 52-58), Suitable for grease lubrication, Operating temperature -30℃ to +120℃, Radial load capacity ≥450 kN

Key Dimensions (Metric/Imperial)
Inner diameter 120.0 mm (4.724 in, tolerance +0.03/-0 mm), Outer diameter 155.0 mm (6.102 in, tolerance +0.04/-0 mm), Overall length 140.0 mm (5.512 in, tolerance ±0.15 mm), Wall thickness 17.5 mm, Chamfered ends 2×45°, with spiral lubrication grooves and axial oil reservoir in the inner bore, suitable for mounting hole diameters of 155.0 mm (tolerance +0.02/-0 mm).

Performance Parameters: Coefficient of friction ≤0.12 (grease lubrication), fatigue resistance ≥10⁶ cycles, corrosion resistance rating IP65, radial runout of the compatible pin ≤0.08 mm, clearance with the pin 0.05-0.08 mm.

Structure and Compatibility Characteristics: Heavy-duty compatible structure: integral forging followed by precision grinding, surface hardening treatment, uniform hardness, suitable for high-frequency oscillation and heavy-duty conditions, reducing wear on the pin and sleeve, and extending component replacement cycle.

High-efficiency lubrication design: spiral lubrication grooves and axial oil reservoir machined in the inner bore ensure uniform grease distribution, forming a stable oil film, reducing the risk of dry friction, suitable for intermittent lubrication or long-term operation.

Machine Compatibility: Compatible with large articulated parts such as boom cylinder lugs, stick connecting rods, and bucket pins on excavators 336E, 349E, 374F, and loaders 982M, 986K, 988K, etc. Compatible pin models include 207-6055 and 207-6056.

Installation and Maintenance Points (Original Data)

Installation: Clean the sleeve, pin, and mounting hole to remove oil, rust, and burrs. Check dimensions with an inside and outside gauge; the clearance must meet the requirement of 0.05-0.08 mm.

Use cold press installation with special tools (such as the 9D-9470 large press kit). Control the installation pressure at 300-380 kN to ensure the sleeve end face is flush with the mounting hole end face, and the coaxiality tolerance is ≤0.08 mm.

After installation, apply lithium-based grease (NLGI 2). The grease should overflow from both ends of the bushing to ensure adequate lubrication.

Maintenance: Check the bushing for wear every 1000 hours. Replace immediately if the inner diameter wear exceeds 0.3 mm or if scratches or peeling appear on the surface.

Regularly check lubrication points and replenish grease every 250 hours to prevent the bushing and pin from seizing due to insufficient lubrication.