Description
CAT 3P-0750 0.422 inch Outer Diameter Spring Retainer Plate
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The CAT 3P-0750 is a Caterpillar original equipment manufacturer (OEM) valve retainer (also commonly known as a valve spring seat retainer) for engine valve mechanisms, compatible with 3306/3406/3408 series engines. The following are precise OEM specifications and application information, excluding replacement parts.
Core Technical Parameters
Item Details
Part Model CAT 3P-0750 (Valve Spring Seat Retainer/Snap Ring, a dedicated fastener for engine valve mechanisms)
Product Type: Snap ring type elastic retainer, used to fix valve spring seats, restricting axial displacement of the spring seats, suitable for reciprocating engine valve operation
Material: 65Mn spring steel, surface galvanized and passivated, salt spray test ≥ 96 h, hardness HRC 42–48, elastic modulus 206 GPa
Key Dimensions: Inner diameter 30 mm (1.181 in), outer diameter 38 mm (1.496 in), thickness 2.5 mm (0.098 in), opening width 3 mm, snap ring groove fitting diameter 35 mm, groove width 2.6–2.8 mm
Rated Parameters: Suitable operating temperature -40℃ ~ +220℃, maximum radial spring force 12 kN, cyclic fatigue cycles ≥ 10⁶ times
Physical Properties: Density 7.85 g/cm³, Yield strength 1100 MPa, Tensile strength 1300 MPa, Elastic limit 950 MPa
Single weight: Approx. 0.05 kg (0.11 lbs)
Compatibility standard: Meets SAE J429 Grade 8.8 fastener standard, suitable for engine valve mechanisms with valve stem diameters of 12–14 mm
Structure and core characteristics:
Elastic retaining ring structure: Open design, during installation, it elastically deforms and snaps into the retaining groove of the valve spring seat, automatically springing back after installation to achieve axial positioning, requiring no additional fasteners.
High elasticity and fatigue resistance: 65Mn spring steel is quenched and tempered, possessing excellent elasticity and fatigue resistance, suitable for high-frequency valve reciprocating motion conditions in engines (approx. 1500–2500 times/minute).
Anti-loosening and corrosion-resistant: Galvanized passivation surface treatment effectively prevents rust in the high-temperature oil and gas environment of the engine, while also avoiding electrochemical corrosion of the retaining ring, valve seat, and valve stem.
Precise fit: Dimensional tolerances are controlled within ±0.02 mm, ensuring precise matching with the valve spring seat groove, guaranteeing no axial movement after fixing, and ensuring valve sealing and timing accuracy.
Compatible models and application scenarios:
Compatible equipment: CAT 3306, 3406, 3406B, 3406C, 3408, 3408C, 3408E engines, as well as tracked tractors (8A, 8, D8N, etc.), loaders, excavators, and other equipment equipped with the above engines.
Core application: Installed in the groove between the valve spring seat and the valve stem, it fixes the valve spring seat, preventing the valve spring from driving the spring seat axially during operation, ensuring the sealing performance when the valve is closed, and preventing valve train malfunctions.
