CAT 461-1253 ADAPTER

CAT 461-1253 is a Caterpillar genuine hydraulic system adapter used for specification conversion and sealing connections of hydraulic lines, pumps, valves, or cylinder interfaces. It is compatible with high-pressure hydraulic circuits of equipment such as excavators and loaders, ensuring stable fluid transmission and interface compatibility. It is a key connector in hydraulic systems for achieving compatibility between different joints/ports. The following are the core information and key points:

Core Technical Parameters
Item Details
Part Model: CAT 461-1253 (4611253) Hydraulic Adapter, original factory precision manufacturing, suitable for high-pressure hydraulic interface conversion scenarios
Material: SCM435 alloy structural steel, surface nitrided + zinc passivation treatment, hardness HRC 38-42, corrosion resistance ≥96 hours neutral salt spray test, suitable for high-pressure working conditions
Key Dimensions: One end 1-1/16″-12 UNF external thread, one end SAE-16 O-ring sealing inner hole, total length 65mm, hexagonal cross-side 38mm, sealing groove diameter 42mm, compatible O-ring 1P-3703 (NBR material)
Compatible Models: CAT 336D2/349D2 excavator, 980M loader, D8T For bulldozers, etc., used for pipeline connection at the main pump outlet, multi-way valve interface, and cylinder port.

Performance Parameters: Rated working pressure 42MPa, burst pressure 126MPa, working temperature -40℃ to 120℃, compatible with mineral oil/synthetic hydraulic oil, seal leakage ≤0.01mL/min

Core Functions and Structure:

Interface Conversion and Adaptation: Enables conversion between threaded interfaces and O-ring seal interfaces, resolving interface incompatibility issues between different hydraulic components (pumps, valves, cylinders, pipelines), ensuring universal pipeline connection.

High-Pressure Seal: O The O-ring seal structure, combined with high-precision threads, ensures reliable sealing under high-pressure conditions, preventing hydraulic oil leakage and maintaining stable system pressure.

Load Transfer and Shock Resistance: The alloy structural steel material possesses high strength, withstanding hydraulic shock and vibration, preventing interface deformation or breakage, and ensuring long-term system operation.

Installation and Positioning: The hexagonal structure facilitates wrench installation, and precise dimensional control ensures coaxial connection, avoiding stress concentration in pipelines and extending the life of pipelines and seals.

Installation and Maintenance Points
Installation Specifications: Clean the interface threads and sealing surfaces, removing oil and impurities. Check the integrity of the O-ring, apply a small amount of hydraulic oil to lubricate the O-ring before installation.

Use a torque wrench to tighten to the recommended torque (120-150 N·m), avoiding over-tightening to avoid damaging the threads or seals. After installation, perform a pressure test (1.5 times the rated pressure, hold for 5 minutes). No leakage indicates合格 (qualified).

Maintenance Recommendations: Check every 500 working hours: Check for looseness and leakage in the adapter, and for damage to the threads and sealing surfaces. Replace immediately if any abnormalities are found.

When replacing, prioritize original equipment manufacturer (OEM) parts. The 461-1253 adapter uses genuine O-rings to prevent leaks, pressure losses, and other malfunctions caused by incompatible materials, sizes, or sealing structures.

Avoid collisions between the adapter and hard objects to prevent damage to the surface coating and corrosion.