CAT 613-4433 273mm Outer Diameter Rear Suspension Sleeve

CAT 613-4433 is a Caterpillar heavy-duty rear axle suspension straight sleeve bearing with an outer diameter of 273 mm. It is suitable for the rear suspension rocker arm pivot and balance shaft bushing of Cat 725/730/735/740/745 articulated trucks. It is used to withstand high radial loads and absorb shock vibrations. It is a core load-bearing and positioning component of the heavy vehicle suspension system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 613-4433, Type: Bimetallic (steel back + copper-lead alloy) straight sleeve bearing, Outer diameter 273.00 mm (tolerance 0/-0.15 mm), Inner diameter 220.00 mm (tolerance +0.05/+0.08 mm), Length 180.00 mm (tolerance ±0.20 mm), Single weight approx. 38.5 kg, Material: Steel back Q345B + CuPb10Sn10 alloy layer (thickness 2.5 mm), Surface tin plating (thickness 5-8 μm), Applicable temperature -40℃ to +150℃, Lubrication method: Oil lubrication (recommended Cat DEO-ULS 15W-40)

Key Dimensions
Steel back wall thickness 8.0 mm, alloy layer thickness 2.5 mm, Chamfers at both ends C3×45°, Inner hole surface roughness Ra≤0.8 μm, hardness steel backing HB220-260, alloy layer HB35-45, mating gap 0.08-0.12 mm, press-fit interference 0.10-0.18 mm
Compatible Models and Applications: Compatible with Cat 725, 730, 730 EJ, ​​735, 740 GC, 740 EJ, ​​745 articulated truck rear suspension rocker arm pivots and balance shaft bushings, 4 pieces per vehicle (2 pieces for each left and right suspension).
Performance Parameters: Rated radial load 2800 kN, ultimate radial load 5200 kN, coefficient of friction μ≤0.01 (oil lubrication), limiting speed 300 rpm, fatigue life ≥2×10⁶ cycles, impact load ≥1200 kN, corrosion rating IP67, alloy layer bonding strength ≥120 MPa
Structural and Performance Advantages
Bimetallic Composite Structure: The steel backing provides high rigidity and load-bearing capacity, while the copper-lead alloy layer offers excellent friction reduction and anti-galling properties, making it suitable for heavy-duty and impact conditions. Compared to single-metal sleeves, its lifespan is increased by more than 30%.

High-Precision Dimensional Control: Strict tolerances for the inner and outer diameters ensure coaxiality ≤0.05 mm after installation, reducing uneven wear in the suspension system and improving driving stability and tire life.

Harsh Working Condition Design: Tin-plated surface enhances corrosion resistance, suitable for dusty and humid environments such as mines and construction sites. The oil lubrication system provides continuous oil supply, preventing overheating failure caused by dry friction.

Pressure-fit Installation: Interference fit with the bearing housing eliminates the need for additional fixing after installation. Maintenance is achieved through disassembly using a dedicated puller, making operation convenient and suitable for the rapid maintenance needs of heavy-duty truck suspensions.

Installation and Maintenance Points: Before installation, clean the outer surfaces of the bearing housing and sleeve, checking for burrs and cracks. Use a hydraulic press to press the sleeve into the bearing housing (pressing speed ≤ 5 mm/s). After pressing, check the inner hole roundness ≤ 0.03 mm and coaxiality ≤ 0.05 mm. Do not strike, as this may cause the alloy layer to peel off.

Every 2000 hours of maintenance, check: If the inner hole wear exceeds 0.20 mm, or if the alloy layer peels off or cracks appear, replace immediately. Regularly check the lubricating oil pressure (normal 0.3-0.5 MPa) to ensure smooth oil supply.

Prioritize using original equipment manufacturer (OEM) sleeve bearings. Aftermarket parts may have insufficient alloy layer thickness and inadequate bonding strength, easily leading to premature wear, bearing seizure, and other failures, endangering driving safety.