Description
CAT 4T-9966 25.5mm Outer Diameter Control Valve Retainer
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The CAT 4T-9966 is a Caterpillar valve spring retainer (valve lock clip/valve lock plate), which is compatible with the valve mechanism of C13, C15 and other engines. It is used to fix the valve spring seat, prevent the spring from falling off during valve movement, ensure accurate valve timing and reliable valve sealing. It has a compact structure, strong locking force, and is suitable for high-speed reciprocating conditions. The following are the core information and key points:
Core Technical Parameters
Item Details
Part Model CAT 4T-9966 (4T9966) Valve Spring Retainer, original factory single-piece supply, compatible with Caterpillar medium and heavy-duty engine valve mechanisms, used for axial positioning and locking of the spring seat
Material High-strength chromium vanadium steel (50CrV4), hardness HRC52-56, surface treated with carbonitriding, diffusion depth 0.2-0.3mm, surface hardness HV700-800, excellent fatigue resistance and wear resistance, suitable for high-speed reciprocating engine conditions
Key Dimensions Inner diameter 10mm, outer diameter 18mm, height 8mm, locking claw angle 45°, compatible valve stem diameter 10mm, spring seat inner diameter 18mm, locking clearance ≤0.02mm, ensuring tight fit with valve stem and spring seat
Compatible Engines CAT C13/C15/C18 engines, compatible with For 320D2/336D2 excavators, 966H/972H loaders, D6T bulldozers, etc., use valve type 10R-7682 and valve spring type 10R-7683 for intake/exhaust valve spring fixing.
Performance Parameters: Operating temperature -40℃ to 300℃, locking force ≥5kN, cycle fatigue life ≥10 million cycles, compatible engine speed 0-2200rpm, radial runout ≤0.03mm, ensuring stable valve movement without deviation.
Core Functions and Structural Features: Precise locking positioning: Symmetrical double-claw design precisely engages with the valve stem groove, fixing the valve spring seat and preventing spring displacement or detachment during valve opening/closing, ensuring normal operation of the valve train and avoiding valve impact with the piston.
High Strength and Fatigue Resistance: Made of chrome vanadium steel with a carbonitriding process, it is suitable for the high-frequency reciprocating motion of engines, withstands valve spring preload and inertial forces, and is not easily deformed or broken over long-term use, meeting the stable locking requirements under harsh operating conditions.
High Compatibility: Standard size fits the valve mechanisms of many Caterpillar engines, requiring no adjustment after installation. Precise clearance with the valve stem and spring seat ensures concentricity and sealing performance during valve movement.
Easy Installation: Symmetrical locking claw structure allows for quick installation with specialized tools. It automatically locks in place after installation, requiring no additional fasteners, improving engine maintenance efficiency.
