CAT 193-0646 85.34mm Thick Spacer

CAT 193-0646 is a Caterpillar steel flat gasket, adapted for rear axle suspension rocker arm pivots and balance shaft bushings of Cat 725/730/735/740/745 articulated trucks. It is used to adjust the mounting clearance of sleeve bearing 613-4433, distribute loads, and prevent leakage. It is a critical positioning and sealing component of heavy-duty suspension systems. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 193-0646, Type: Flat Washer (Stamped Steel), Material: S45C Medium Carbon Steel (Galvanized and Passivated Surface), Single Weight: Approx. 0.52 kg, Applicable Temperature: -40℃ to +150℃, Rated Working Pressure: 0-10 MPa, Compatible Sleeve Outer Diameter: 273 mm, Matching Sleeve: 613-4433, Base Assembly: 391-9813

Key Dimensions
Inner Diameter: 220.00 mm (Tolerance 0/+0.05 mm), Outer Diameter: 273.00 mm (Tolerance 0/-0.10 mm), Thickness: 3.00 mm (Tolerance ±0.03 mm), Flatness: ≤0.02 mm, Surface Roughness: Ra≤1.6 μm, Hardness: HB200-240, Galvanized Layer Thickness: 8-12 μm, Chamfered Ends C1×45°
Compatible Models and Applications: Compatible with Cat 725, 730, 730 EJ, ​​735, 740 GC, 740 EJ, ​​and 745 articulated truck rear suspension rocker arm pivots and balance shaft bushings. 4 pieces per vehicle (2 for each left and right suspension), installed between the sleeve bearing and the base assembly.

Performance Parameters: Rated load capacity 800 MPa, shear strength 450 MPa, coefficient of friction μ≤0.15 (dry state), salt spray resistance ≥480 hours, compression rebound rate ≥85%, flatness error ≤0.02 mm, galvanized coating adhesion grade 1.

Structural and Performance Advantages: High-strength steel substrate: S45C medium carbon steel provides high rigidity and load-bearing capacity, suitable for high-pressure conditions of heavy-duty suspensions. The galvanized passivated surface enhances corrosion resistance, suitable for dusty and humid environments such as mining and infrastructure projects.

Cat® Parts High-precision dimensional control: Strict tolerances for inner diameter, outer diameter, and thickness ensure uniform clearance (0.05-0.10 mm) after installation, reducing wear on the sleeve bearings and improving the positioning accuracy of the suspension system.

Leakage prevention and load distribution: A smooth surface fits tightly against the base and sleeve, preventing lubricant leakage and distributing the radial load on the sleeve bearings, reducing localized stress concentration and extending component life.

Standardized assembly: Installs with 613-4433 sleeves and 391-9813 bases, requiring no additional machining. Quick replacement is possible during maintenance, meeting the efficient maintenance needs of heavy-duty truck suspensions.

Installation and maintenance points: Before installation, clean the surfaces of the gaskets, sleeves, and bases, checking for burrs and cracks. Ensure the gaskets are flat and free from deformation. During installation, the coaxiality with the sleeve should be ≤0.05 mm. Avoid impacts that could cause flatness defects. During maintenance every 2000 hours, check the following: Gaskets deformed by more than 0.10 mm, with peeling or cracks in the galvanized layer, must be replaced immediately. Regularly check the installation clearance to ensure it is within the range of 0.05-0.10 mm (Cat® Parts).

Prioritize using genuine Cat® Parts gaskets. Aftermarket parts may have dimensional deviations, insufficient material strength, etc., easily leading to leaks, uneven sleeve wear, and other malfunctions, endangering driving safety (Cat® Parts).