Description
CAT 4L-3761 RETAINER A
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The CAT 4L-3761 is a high-pressure fuel line retainer assembly for Caterpillar engines, compatible with heavy-duty engines such as the Cat C13 and C15. It is used for the integrated positioning and anti-loosening of multiple high-pressure fuel lines, preventing pipe displacement, leakage, or fatigue fracture caused by vibration. It is the core fastening assembly for high-pressure fuel lines. The following is structured technical and application information:
Core Technical Parameters
Item Details
Basic Attributes
Model 4L-3761, Type: High-pressure oil pipe fixing clamp assembly, Material: 65Mn spring steel (zinc-plated and passivated surface), Assembly includes 2 fixing clamps + 1 connecting bracket, Single unit weight approximately 0.2 kg, Applicable temperature: -40℃ to +150℃, Compatible pipe diameter: 14 mm (outer diameter of high-pressure oil pipe), Installation method: Bolt fixing (M10×1.5), Matching bolts: 4L-3762, Nuts: 4L-3763
Key Dimensions
Clamp body length: 52 mm, Width: 22 mm, Thickness: 6 mm, Clamping groove diameter: 14.2 mm (tolerance +0.10/-0.05 mm), Bolt hole center distance: 38 mm, Clamping groove depth: 9 mm, Bracket length: 78 mm, Width: 25 mm, Thickness: 8 mm, Surface roughness: Ra≤1.6 μm, Hardness: HRC42-48, elastic deformation ≤0.5 mm
Compatible Models and Applications: Compatible with Cat C13, C15, and C18 engines (excavator 349GC, loader 980GC, etc.). Mounted on the high-pressure oil pipe bracket on the engine cylinder head side for fixing the high-pressure oil pipes of cylinders 2-5. 3 components are required per engine group. Matching high-pressure oil pipes: 438-6138.
Performance Parameters: Single clamping force ≥900 N, overall component fatigue life ≥10⁶ cycles (vibration frequency 10-2000 Hz, acceleration 10 g), salt spray resistance conforms to ISO 9227 standard (no red rust after 72 hours), oil resistance conforms to SAE J1885 standard, bolt tightening torque 18-22 N・m
Structural and Performance Advantages:
Integrated Design: The component includes 2 fixing clamps and 1 connecting bracket, allowing simultaneous fixing of 2… Compared to standalone fasteners, this high-pressure oil hose fastener offers higher integration, improving installation efficiency by approximately 40%, reducing piping space requirements, and fitting the compact engine compartment structure.
Precise clamping and anti-loosening: The clamping groove features a rounded transition, conforming to the oil hose surface and avoiding localized stress concentration; the spring steel material provides durable elasticity, compensating for vibration displacement and maintaining stable clamping force, improving anti-loosening performance by approximately 60% compared to ordinary fasteners.
High corrosion and wear resistance: A galvanized passivated surface treatment resists corrosion from oil and moisture in the engine compartment; the smooth clamping surface reduces relative friction between the oil hose and the hose, lowering the risk of leakage and extending the service life of the piping and fastener.
Standardized installation: M10×1.5 bolt holes are compatible with universal tools, requiring no special equipment for installation, offering high positioning accuracy, quick replacement, reducing maintenance time and costs, and adapting to heavy-duty engine high-pressure conditions (2000 bar).
Installation and Maintenance Points: Before installation, clean the components and oil pipe surfaces to ensure they are free of oil and impurities. Align the clamping slots of the retaining clamp with the high-pressure oil pipe, align the bracket bolt holes with the cylinder head bracket holes, and tighten the bolts in two stages to the specified torque (10-15 N·m the first time, 18-22 N·m the second time) to avoid deformation of the clamp or bracket.
Every 2000 hours of maintenance, inspect the appearance of the components. If cracks, deformation, or peeling of the galvanized layer are found, replace them immediately. Check the gap between the oil pipe and the clamp. If the gap is >0.2 mm, readjust or replace the component to prevent oil pipe vibration from causing leaks.
Prioritize genuine parts. Aftermarket parts must match the material elasticity and clamping precision. Inferior components can easily lead to loose oil pipes, causing fuel leaks, insufficient engine power, and even damage to the high-pressure oil pump.
