Description
CAT 109-5255 ADAPTER
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The CAT 109-5255 is a Caterpillar genuine hydraulic port adapter (used for high-pressure hydraulic line conversion, compatible with excavator/loader hydraulic systems). The following is the original data and does not include information on replacement parts.
Core Technical Parameters (Raw Data)
Item Details
Basic Attributes Model 109-5255, type is hydraulic port threaded adapter, material 42CrMo alloy steel, surface anodized blackening treatment, single weight 0.12 kg, working pressure ≤35 MPa, working temperature -40℃ to +120℃, compatible with SAE J514-24° cone seal standard, medium compatible with mineral oil / synthetic hydraulic oil
Key Dimensions One end thread 1-1/16″-12 UNJF (internal thread), the other end thread 3/4″-16 UNF (external thread), cone angle 24°, cone diameter φ28.575 mm (1-1/8 in), total length 58.42 mm (2.3 in), thread tolerance Class 3A/3B, cone surface roughness Ra 0.8 μm, sealing surface flatness ≤0.015 mm
Compatible Models and Locations Compatible with Cat One piece for each of the following: 320D/323D excavator main pump outlet, 950H loader distributor valve inlet, and C15 engine hydraulic oil cooler interface. Used for high-pressure oil circuit connection between different port sizes to prevent leakage.
Performance Parameters: Tensile strength ≥1080 MPa, Yield strength ≥930 MPa, Rockwell hardness HRC 32-38, Sealing surface pressure resistance 35 MPa without leakage, Threaded connection torque 120-150 N・m, Repeated disassembly/removal cycles ≥50 times (no leakage).
Structural and Performance Advantages:
High-strength material: 42CrMo alloy steel, resistant to fatigue and impact, suitable for high-pressure hydraulic conditions, and not easily deformed or broken.
24° cone seal design: No additional sealing ring required; the cone surface and cone hole fit together to form a metal seal, suitable for high-pressure and vibration environments, with high sealing reliability.
Precision thread tolerance: Class 3A/3B thread fit, ensuring a tight connection and preventing loosening that could lead to leakage.
Oxidation blackening treatment: Improves surface wear resistance and corrosion resistance, suitable for harsh working conditions in engineering machinery, and extends service life.
Installation and Maintenance Points (Original Data)
Installation: Clean the threads and conical surface (free of oil and impurities), apply a small amount of thread-locking adhesive (Loctite 243), and tighten with a torque wrench to 120-150 N·m. Check that the conical surface fit gap is ≤0.02 mm. Over-torque installation is strictly prohibited.
Maintenance: Every 1500 hours, check for sealing surface wear (conical surface wear ≤0.03 mm) and thread damage. Replace immediately if scratches, deformation, or leakage are found.
Troubleshooting: For leaks, check the cleanliness of the conical surface and torque; for stripped threads, replace the adapter and check the matching interface; for leaks under high-pressure conditions, replace and confirm pressure rating compatibility.
