CAT 135-2443 6mm Inner Diameter Ring

CAT 135-2443 is a Caterpillar hydraulic system-specific end face sealing ring (retaining ring type combination ring) used for sealing the shaft end/cavity end face of components such as hydraulic pumps and rotary motors. It prevents high-pressure oil leakage and contaminant intrusion, is suitable for medium and high pressure working conditions, and ensures the sealing reliability of the transmission system. It is commonly found in Cat® Parts, the core hydraulic components of equipment such as excavators and loaders. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 135-2443, Type: End-face sealing combination ring (including metal retaining ring + elastic sealing ring), Metal material: 304 stainless steel (hardness HV≥200), Elastic ring material: HNBR (hydrogenated nitrile rubber, hardness 75 Shore A), Single weight: approximately 0.18 kg, Operating temperature: -40℃ to +150℃, Suitable for hydraulic systems with pressure ≤40 MPa, Oil resistance meets SAE 100 standard, Aging life ≥8000 hours (normal working conditions), Extrusion gap ≤0.15 mm, Complies with ISO 3601 sealing standard

Key Dimensions
Inner diameter: 85 mm (tolerance +0.01/-0.005 mm), Outer diameter: 112 mm (tolerance +0.02/-0.01 mm), Metal retaining ring thickness: 3 mm (tolerance 0/-0.05 mm) mm), elastic ring cross-section diameter 5 mm (tolerance + 0.03/-0.02 mm), positioning groove diameter 98 mm (tolerance + 0.01/-0.005 mm), sealing surface flatness ≤0.01 mm, installation chamfer r0.8 mm, radial fit clearance 0.01-0.02 mm (with cavity).

Compatible Models and Accessories: Compatible with Cat 320GC, 323GC excavators, 966M loaders, and other equipment equipped with C7.1 engines. Used on hydraulic pump housing end faces, swing motor end covers, etc. Matching components include 135-2444 elastic sealing rings and 5P-0960 extreme pressure lithium-based grease. Can be used in combination with 389-0698 retainers, 8E-8162 sealing sleeves, etc. Compatible bolt type is 12-1982 (M10×1.5×25 mm).

Performance Parameters: Sealing surface roughness Ra≤0.8 μm, tensile strength of metal retaining ring≥520 MPa, compression set of elastic ring≤15% (100℃×70 hours), leakage rate≤0.01 mL/min (35 MPa operating condition), high-pressure pulse resistance≥1 million cycles (35 MPa, 1 Hz)

Structural and Performance Advantages: The stainless steel retaining ring + HNBR elastic ring combination design prevents high-pressure extrusion of the elastic ring, while the elastic ring provides stable sealing force, adapting to frequent pressure fluctuations in high-pressure hydraulic systems and improving sealing reliability.

Precise dimensional tolerances and sealing surface flatness control ensure a tight fit with the installation end face, reducing leakage risk, adapting to compact equipment layouts, and simplifying the installation process.

HNBR material is resistant to high and low temperatures and oil, suitable for harsh operating conditions in engineering machinery, preventing aging and expansion failure of the sealing ring, and extending the service life of sealing components.

Installation and Maintenance Points: Before installation, clean the sealing ring, mounting face, and positioning groove. Check for burrs, rust, or deformation. Apply appropriate grease to the elastic ring. Install the metal retaining ring precisely into the positioning groove to prevent twisting or extrusion of the elastic ring.

During installation, use a special tool to press evenly, ensuring a tight fit between the sealing surfaces. Tighten the bolts diagonally, with a pre-tightening torque of 22-25 N·m to prevent uneven stress that could deform the sealing surface.

Maintenance: Check for wear and leakage on the sealing surface every 800 hours. If cracks appear in the elastic ring, deformation of the metal retaining ring, or damage to the sealing surface, replace it immediately. Replace the elastic ring simultaneously with the elastic ring; do not mix sealing rings of different models.