CAT 156-6817 SLEEVE

CAT 156-6817 is a Caterpillar shaft locating sleeve/spacer, commonly used for bearing positioning, shoulder spacing adjustment, and axial limiting of excavators, loaders, wheel ends, final drives, or hydraulic components. It is compatible with wheel hubs, planetary carriers, or cylinder piston shafts of Cat 320D/336D excavators, 950M/966M loaders, and other models. It is a key Cat® Parts connector that ensures transmission accuracy and component coaxiality. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 156-6817, Type: Shaft Positioning Sleeve (Solid Cylindrical Spacer), Material: 42CrMo Alloy Steel (Quenched and Tempered, Hardness HB280-320), Surface: Black Oxidation (Corrosion Resistance Grade ≥72 hours Salt Spray No Rust), Single Weight: Approx. 1.2 kg, Applicable Temperature: -40℃ to +150℃, Rated Static Load ≥180 kN, Rated Dynamic Load ≥120 kN, Fatigue Life ≥10000 hours

Key Dimensions
Inner Diameter: 80 mm (Tolerance 0 to -0.012 mm), Outer Diameter: 100 mm (Tolerance +0.010 to +0.022 mm), Length: 45 mm (Tolerance ±0.10 mm), Parallelism of Both End Faces: ≤0.01 mm, End Face Runout: ≤0.015 mm, Chamfer: 1.5 45° x mm, fits shaft diameter 80 mm (interference fit 0.005-0.015 mm recommended), fits bearing model 304-2603/188-4103, and the matching fastener is 114-9483 elastic retaining ring.

Compatible Machines and Applications: Compatible with Cat 320D, 323D, 336D excavators, 950M, 966M loaders. Used for inner ring positioning of wheel hub bearings, spacer sleeve of final drive planetary carrier spindle, and adjustment of hydraulic cylinder piston shoulder spacing. Matching parts include bearings, elastic retaining rings, and lock nuts. The installation part must fit snugly against the shaft shoulder, with a coaxiality error ≤0.02 mm.

Performance Parameters: Tensile strength ≥1000 MPa, Yield strength ≥800 MPa, Elongation ≥12%, Impact toughness ≥60 J/cm², Radial runout after installation ≤0.02 mm, End face fit ≥98%, Impact load resistance ≥25. kN, suitable for equipment vibration frequencies ≤120 Hz.

Structural and Performance Advantages

Precise Positioning and Spacing: Made of 42CrMo alloy steel, it boasts high rigidity and dimensional accuracy, allowing for precise adjustment of the bearing inner ring/shoulder spacing. This limits axial movement of components, ensures coaxiality of the transmission system, and prevents bearing wear and abnormal noise caused by displacement.

High Load Capacity and Deformation Resistance: After heat treatment, it possesses high tensile strength, yield strength, and impact toughness, suitable for radial and axial loads under heavy-duty conditions. It is resistant to deformation over long-term use, ensuring stable positioning accuracy.

High Compatibility: Compatible with bearings such as 304-2603 and retaining rings such as 114-9483, with high dimensional matching. No additional adjustments are required after installation. It is compatible with various transmission and hydraulic components of Caterpillar construction machinery. Easy Installation: Solid cylindrical structure, cold-press fitting (pressure ≤30 kN), no special tools required. After installation, it fits tightly against the shaft shoulder/bearing inner ring, allowing for quick positioning and clearance adjustment.

Installation and Maintenance Points: Before installation, clean the sleeve, shaft diameter, and bearing inner ring, checking for burrs, cracks, and rust. Use interference fit pressing (pressing force 30 kN, applied to the end face) to ensure the sleeve and shaft shoulder are fully fitted, with coaxiality ≤0.02 mm and end face runout ≤0.015 mm.

Perform a 2-hour trial run, checking for looseness and abnormal noise in the sleeve, and ensuring the bearing temperature is ≤75℃. Every 1500 hours of maintenance, check the surface condition and fit clearance of the sleeve. Replace the sleeve if the fit clearance is >0.02 mm, the surface rust area exceeds 15%, or deformation occurs.

When replacing parts, original parts should be used first to ensure material and dimensional accuracy. After installation, check the condition of bearings, elastic retaining rings and lock nuts to prevent premature damage to transmission components due to positioning failure.